diff --git a/client/src/features/book/components/BookFilterBuilder.vue b/client/src/features/book/components/BookFilterBuilder.vue
index 00a9cc07a..a4b003645 100644
--- a/client/src/features/book/components/BookFilterBuilder.vue
+++ b/client/src/features/book/components/BookFilterBuilder.vue
@@ -3,6 +3,9 @@ import { ref, watch } from 'vue'
 import { Plus, Trash2 } from 'lucide-vue-next'
 import { FIELD_OPERATORS, RULE_FIELDS, type GroupRule, type Rule, type RuleField, type RuleOperator } from '@projectx/types'
 import { FIELD_LABELS, OPERATOR_LABELS } from '@/features/book/lib/filter-labels'
+import FilterChipTypeahead from './FilterChipTypeahead.vue'
+import FilterFormatPicker from './FilterFormatPicker.vue'
+import FilterTextTypeahead from './FilterTextTypeahead.vue'
 
 const props = defineProps<{
   modelValue: GroupRule | undefined
@@ -13,52 +16,79 @@ const emit = defineEmits<{
   'update:modelValue': [value: GroupRule | undefined]
 }>()
 
-const MAX_DEPTH = 2
+const MAX_DEPTH = 5
 const NUMERIC_FIELDS: RuleField[] = ['seriesIndex', 'publishedYear', 'pageCount', 'rating']
 const DATE_FIELDS: RuleField[] = ['addedAt']
 const NO_VALUE_OPERATORS: RuleOperator[] = ['isEmpty', 'isNotEmpty', 'isMissing', 'isPresent', 'isUnread', 'isInProgress', 'isFinished']
 const BETWEEN_OPERATORS: RuleOperator[] = ['between']
 const COLLECTION_OPERATORS: RuleOperator[] = ['includesAny', 'includesAll', 'excludesAll']
 
+const CHIP_TYPEAHEAD_FIELDS: RuleField[] = ['author', 'genre', 'tag', 'collection']
+const TEXT_TYPEAHEAD_FIELDS: RuleField[] = ['publisher', 'series', 'language']
+
+const ENDPOINT_BY_FIELD: Partial<Record<RuleField, string>> = {
+  author: '/api/v1/metadata/authors',
+  genre: '/api/v1/metadata/genres',
+  tag: '/api/v1/metadata/tags',
+  collection: '/api/v1/metadata/collections',
+  publisher: '/api/v1/metadata/publishers',
+  series: '/api/v1/metadata/series',
+  language: '/api/v1/metadata/languages',
+}
+
+type WithinLastUnit = 'days' | 'weeks' | 'months'
+
 interface EditableRule {
   field: RuleField
   operator: RuleOperator
   value: string
+  valueChips: string[]
   valueTo: string
+  valueUnit: WithinLastUnit
 }
 
-type LocalNode = { kind: 'rule'; rule: EditableRule } | { kind: 'group'; group: GroupRule }
+type LocalNode = { id: number; kind: 'rule'; rule: EditableRule } | { id: number; kind: 'group'; group: GroupRule }
 
-function makeEmptyRule(): EditableRule {
-  return { field: 'title', operator: 'contains', value: '', valueTo: '' }
+let nodeIdCounter = 0
+function nextId() {
+  return ++nodeIdCounter
+}
+
+function makeEmptyRule(): LocalNode {
+  return { id: nextId(), kind: 'rule', rule: { field: 'title', operator: 'contains', value: '', valueChips: [], valueTo: '', valueUnit: 'days' } }
 }
 
 function toEditableRule(r: Rule): EditableRule {
+  const usesChips = Array.isArray(r.value)
   return {
     field: r.field,
     operator: r.operator,
-    value: Array.isArray(r.value) ? (r.value as string[]).join(', ') : String(r.value ?? ''),
+    value: usesChips ? '' : String(r.value ?? ''),
+    valueChips: usesChips ? (r.value as string[]) : [],
     valueTo: String(r.valueTo ?? ''),
+    valueUnit: 'days',
   }
 }
 
 function toLocalNodes(group: GroupRule | undefined): LocalNode[] {
   if (!group) return []
   return group.rules.map((r) =>
-    r.type === 'rule' ? { kind: 'rule' as const, rule: toEditableRule(r) } : { kind: 'group' as const, group: r as GroupRule },
+    r.type === 'rule'
+      ? { id: nextId(), kind: 'rule' as const, rule: toEditableRule(r) }
+      : { id: nextId(), kind: 'group' as const, group: r as GroupRule },
   )
 }
 
-function parseValue(field: RuleField, operator: RuleOperator, raw: string): Rule['value'] {
+function parseValue(field: RuleField, operator: RuleOperator, raw: string, chips: string[], unit: WithinLastUnit): Rule['value'] {
   if (NO_VALUE_OPERATORS.includes(operator)) return undefined
-  if (COLLECTION_OPERATORS.includes(operator)) {
-    return raw
-      .split(',')
-      .map((s) => s.trim())
-      .filter(Boolean)
-  }
+  if (COLLECTION_OPERATORS.includes(operator)) return chips
   if (NUMERIC_FIELDS.includes(field)) return raw === '' ? undefined : Number(raw)
-  if (DATE_FIELDS.includes(field) && operator === 'withinLast') return raw === '' ? undefined : Number(raw)
+  if (DATE_FIELDS.includes(field) && operator === 'withinLast') {
+    if (raw === '') return undefined
+    const n = Number(raw)
+    const multiplier = unit === 'weeks' ? 7 : unit === 'months' ? 30 : 1
+    return n * multiplier
+  }
   return raw || undefined
 }
 
@@ -77,7 +107,7 @@ watch(
 
 function isRuleComplete(r: EditableRule): boolean {
   if (NO_VALUE_OPERATORS.includes(r.operator)) return true
-  if (COLLECTION_OPERATORS.includes(r.operator)) return r.value.split(',').some((s) => s.trim() !== '')
+  if (COLLECTION_OPERATORS.includes(r.operator)) return r.valueChips.length > 0
   return r.value.trim() !== ''
 }
 
@@ -91,14 +121,14 @@ function emitUpdate() {
     return
   }
   const rules: (Rule | GroupRule)[] = nodes.value
-    .filter((n) => n.kind === 'group' || isRuleComplete(n.rule))
+    .filter((n) => (n.kind === 'group' && n.group.rules.length > 0) || (n.kind === 'rule' && isRuleComplete(n.rule)))
     .map((n) => {
       if (n.kind === 'group') return n.group
       return {
         type: 'rule' as const,
         field: n.rule.field,
         operator: n.rule.operator,
-        value: parseValue(n.rule.field, n.rule.operator, n.rule.value),
+        value: parseValue(n.rule.field, n.rule.operator, n.rule.value, n.rule.valueChips, n.rule.valueUnit),
         valueTo:
           BETWEEN_OPERATORS.includes(n.rule.operator) && n.rule.valueTo !== ''
             ? NUMERIC_FIELDS.includes(n.rule.field)
@@ -107,7 +137,15 @@ function emitUpdate() {
             : undefined,
       }
     })
-  emit('update:modelValue', rules.length > 0 ? { type: 'group', join: join.value, rules } : undefined)
+  const isSubGroup = (props.depth ?? 0) > 0
+  if (!isSubGroup && rules.length === 0) {
+    // Top-level: no complete rules means no active filter — don't send an empty group to the API.
+    emit('update:modelValue', undefined)
+    return
+  }
+  // Sub-group: always emit a group when nodes exist so the parent keeps this node alive.
+  // undefined is reserved for "zero nodes" and signals the parent to remove the group.
+  emit('update:modelValue', { type: 'group', join: join.value, rules })
 }
 
 function setJoin(value: 'AND' | 'OR') {
@@ -116,13 +154,14 @@ function setJoin(value: 'AND' | 'OR') {
 }
 
 function addRule() {
-  nodes.value.push({ kind: 'rule', rule: makeEmptyRule() })
+  nodes.value.push(makeEmptyRule())
 }
 
 function addGroup() {
   nodes.value.push({
+    id: nextId(),
     kind: 'group',
-    group: { type: 'group', join: 'AND', rules: [{ type: 'rule', field: 'title', operator: 'contains' }] },
+    group: { type: 'group', join: 'AND', rules: [] },
   })
 }
 
@@ -139,7 +178,21 @@ function onFieldChange(index: number) {
     node.rule.operator = validOps[0]!
   }
   node.rule.value = ''
+  node.rule.valueChips = []
   node.rule.valueTo = ''
+  node.rule.valueUnit = 'days'
+  emitUpdate()
+}
+
+function onOperatorChange(index: number) {
+  const node = nodes.value[index]
+  if (node?.kind !== 'rule') return
+  if (COLLECTION_OPERATORS.includes(node.rule.operator)) {
+    node.rule.value = ''
+    node.rule.valueTo = ''
+  } else {
+    node.rule.valueChips = []
+  }
   emitUpdate()
 }
 
@@ -160,10 +213,6 @@ function valueInputType(field: RuleField, operator: RuleOperator): string {
   return 'text'
 }
 
-function showValueInput(operator: RuleOperator): boolean {
-  return !NO_VALUE_OPERATORS.includes(operator)
-}
-
 function showValueToInput(operator: RuleOperator): boolean {
   return BETWEEN_OPERATORS.includes(operator)
 }
@@ -171,8 +220,8 @@ function showValueToInput(operator: RuleOperator): boolean {
 
 <template>
   <div class="flex flex-col gap-2.5">
-    <!-- AND / OR join toggle -->
-    <div v-if="nodes.length > 1" class="flex items-center gap-2 mb-0.5">
+    <!-- AND / OR join toggle — always visible in sub-groups, shown at root only when 2+ nodes -->
+    <div v-if="nodes.length > 1 || (depth ?? 0) > 0" class="flex items-center gap-2 mb-0.5">
       <span class="text-xs text-muted-foreground">Match</span>
       <div class="flex rounded-md border border-input overflow-hidden">
         <button
@@ -193,31 +242,71 @@ function showValueToInput(operator: RuleOperator): boolean {
       <span class="text-xs text-muted-foreground">of the following rules</span>
     </div>
 
-    <template v-for="(node, index) in nodes" :key="index">
+    <template v-for="(node, index) in nodes" :key="node.id">
       <!-- Rule row -->
       <div v-if="node.kind === 'rule'" class="flex flex-wrap items-center gap-2 rounded-lg border border-border/60 bg-muted/20 px-3 py-2.5">
         <select
           v-model="node.rule.field"
           @change="onFieldChange(index)"
-          class="h-9 rounded-md border border-input bg-background text-foreground text-sm px-2 focus:outline-none focus:ring-2 focus:ring-primary"
+          class="h-9 rounded-md border border-input bg-background text-foreground text-sm px-2 focus:outline-none focus:ring-2 focus:ring-primary shrink-0"
         >
           <option v-for="field in RULE_FIELDS" :key="field" :value="field">{{ FIELD_LABELS[field] }}</option>
         </select>
 
         <select
           v-model="node.rule.operator"
-          @change="emitUpdate"
-          class="h-9 rounded-md border border-input bg-background text-foreground text-sm px-2 focus:outline-none focus:ring-2 focus:ring-primary"
+          @change="onOperatorChange(index)"
+          class="h-9 rounded-md border border-input bg-background text-foreground text-sm px-2 focus:outline-none focus:ring-2 focus:ring-primary shrink-0"
         >
           <option v-for="op in FIELD_OPERATORS[node.rule.field]" :key="op" :value="op">{{ OPERATOR_LABELS[op] }}</option>
         </select>
 
-        <template v-if="showValueInput(node.rule.operator)">
+        <!-- Chip typeahead: author/genre/tag/collection always; publisher/series/language when using multi-value operators -->
+        <FilterChipTypeahead
+          v-if="
+            (CHIP_TYPEAHEAD_FIELDS.includes(node.rule.field) || TEXT_TYPEAHEAD_FIELDS.includes(node.rule.field)) &&
+            COLLECTION_OPERATORS.includes(node.rule.operator)
+          "
+          v-model="node.rule.valueChips"
+          :endpoint="ENDPOINT_BY_FIELD[node.rule.field]!"
+          @update:model-value="emitUpdate"
+        />
+        <!-- Format inline toggle picker -->
+        <FilterFormatPicker v-else-if="node.rule.field === 'format'" v-model="node.rule.valueChips" @update:model-value="emitUpdate" />
+        <!-- withinLast: number + unit selector -->
+        <template v-else-if="node.rule.operator === 'withinLast'">
+          <input
+            v-model="node.rule.value"
+            type="number"
+            min="1"
+            placeholder="e.g. 7"
+            class="h-9 w-20 rounded-md border border-input bg-background text-foreground text-sm px-2 focus:outline-none focus:ring-2 focus:ring-primary"
+            @input="emitUpdate"
+          />
+          <select
+            v-model="node.rule.valueUnit"
+            class="h-9 rounded-md border border-input bg-background text-foreground text-sm px-2 focus:outline-none focus:ring-2 focus:ring-primary"
+            @change="emitUpdate"
+          >
+            <option value="days">days</option>
+            <option value="weeks">weeks</option>
+            <option value="months">months</option>
+          </select>
+        </template>
+        <!-- Text typeahead: publisher, series, language -->
+        <FilterTextTypeahead
+          v-else-if="TEXT_TYPEAHEAD_FIELDS.includes(node.rule.field) && !NO_VALUE_OPERATORS.includes(node.rule.operator)"
+          v-model="node.rule.value"
+          :endpoint="ENDPOINT_BY_FIELD[node.rule.field]!"
+          @update:model-value="emitUpdate"
+        />
+        <!-- Standard input: text, number, date -->
+        <template v-else-if="!NO_VALUE_OPERATORS.includes(node.rule.operator)">
           <input
             v-model="node.rule.value"
             @input="emitUpdate"
             :type="valueInputType(node.rule.field, node.rule.operator)"
-            :placeholder="COLLECTION_OPERATORS.includes(node.rule.operator) ? 'comma-separated' : 'value'"
+            placeholder="value"
             class="h-9 rounded-md border border-input bg-background text-foreground text-sm px-2 focus:outline-none focus:ring-2 focus:ring-primary min-w-32 flex-1"
           />
           <template v-if="showValueToInput(node.rule.operator)">
@@ -242,7 +331,7 @@ function showValueToInput(operator: RuleOperator): boolean {
 
       <!-- Nested group -->
       <div v-else-if="node.kind === 'group'" class="flex items-start gap-2">
-        <div class="flex-1 rounded-xl border border-primary/20 bg-primary/[0.03] p-3">
+        <div class="flex-1 rounded-xl border border-primary/20 bg-primary/3 p-3">
           <div class="flex items-center justify-between mb-3">
             <span class="text-[10px] font-semibold uppercase tracking-widest text-primary/50">Group</span>
           </div>
diff --git a/client/src/features/book/components/FilterChipTypeahead.vue b/client/src/features/book/components/FilterChipTypeahead.vue
new file mode 100644
index 000000000..2381a8a60
--- /dev/null
+++ b/client/src/features/book/components/FilterChipTypeahead.vue
@@ -0,0 +1,127 @@
+<script setup lang="ts">
+import { onUnmounted, ref, watch } from 'vue'
+import { X } from 'lucide-vue-next'
+import { api } from '@/lib/api'
+
+const props = defineProps<{
+  modelValue: string[]
+  endpoint: string
+  placeholder?: string
+}>()
+
+const emit = defineEmits<{ 'update:modelValue': [value: string[]] }>()
+
+const query = ref('')
+const suggestions = ref<string[]>([])
+const showDropdown = ref(false)
+const activeIndex = ref(-1)
+let debounceTimer: ReturnType<typeof setTimeout> | null = null
+let latestRequestId = 0
+
+watch(query, (q) => {
+  if (debounceTimer) clearTimeout(debounceTimer)
+  if (!q.trim()) {
+    suggestions.value = []
+    showDropdown.value = false
+    return
+  }
+  debounceTimer = setTimeout(async () => {
+    const requestId = ++latestRequestId
+    const res = await api(`${props.endpoint}?q=${encodeURIComponent(q)}`)
+    if (requestId !== latestRequestId) return
+    if (!res.ok) return
+    const data: { name: string }[] = await res.json()
+    suggestions.value = data.map((d) => d.name).filter((name) => !props.modelValue.includes(name))
+    showDropdown.value = suggestions.value.length > 0
+    activeIndex.value = -1
+  }, 200)
+})
+
+onUnmounted(() => {
+  if (debounceTimer) clearTimeout(debounceTimer)
+  latestRequestId = -1
+})
+
+function addChip(value: string) {
+  const trimmed = value.trim()
+  if (!trimmed || props.modelValue.includes(trimmed)) return
+  emit('update:modelValue', [...props.modelValue, trimmed])
+  query.value = ''
+  suggestions.value = []
+  showDropdown.value = false
+}
+
+function removeChip(value: string) {
+  emit(
+    'update:modelValue',
+    props.modelValue.filter((v) => v !== value),
+  )
+}
+
+function onKeydown(e: KeyboardEvent) {
+  if (e.key === 'Enter') {
+    e.preventDefault()
+    if (activeIndex.value >= 0 && suggestions.value[activeIndex.value]) {
+      addChip(suggestions.value[activeIndex.value]!)
+    } else if (query.value.trim()) {
+      addChip(query.value)
+    }
+  } else if (e.key === 'ArrowDown') {
+    e.preventDefault()
+    activeIndex.value = Math.min(activeIndex.value + 1, suggestions.value.length - 1)
+  } else if (e.key === 'ArrowUp') {
+    e.preventDefault()
+    activeIndex.value = Math.max(activeIndex.value - 1, -1)
+  } else if (e.key === 'Escape') {
+    showDropdown.value = false
+  } else if (e.key === 'Backspace' && !query.value && props.modelValue.length > 0) {
+    removeChip(props.modelValue[props.modelValue.length - 1]!)
+  }
+}
+
+function onBlur() {
+  setTimeout(() => {
+    showDropdown.value = false
+  }, 150)
+}
+</script>
+
+<template>
+  <div
+    class="relative flex flex-wrap items-center gap-1 min-w-48 flex-1 rounded-md border border-input bg-background px-2 py-1.5 focus-within:ring-2 focus-within:ring-primary"
+  >
+    <span
+      v-for="chip in modelValue"
+      :key="chip"
+      class="flex items-center gap-1 h-5 px-1.5 rounded bg-primary/15 text-primary text-xs font-medium shrink-0"
+    >
+      {{ chip }}
+      <button type="button" @click="removeChip(chip)" class="text-primary/60 hover:text-primary leading-none">
+        <X :size="10" />
+      </button>
+    </span>
+    <input
+      v-model="query"
+      type="text"
+      :placeholder="modelValue.length === 0 ? (placeholder ?? 'Type to search...') : ''"
+      class="flex-1 min-w-20 bg-transparent text-foreground text-sm outline-none placeholder:text-muted-foreground"
+      @keydown="onKeydown"
+      @blur="onBlur"
+    />
+    <div
+      v-if="showDropdown"
+      class="absolute top-full left-0 mt-1 z-50 w-full min-w-48 max-h-48 overflow-y-auto rounded-md border border-border bg-popover shadow-md"
+    >
+      <button
+        v-for="(suggestion, i) in suggestions"
+        :key="suggestion"
+        type="button"
+        class="w-full text-left px-3 py-1.5 text-sm text-foreground hover:bg-accent transition-colors"
+        :class="{ 'bg-accent': i === activeIndex }"
+        @mousedown.prevent="addChip(suggestion)"
+      >
+        {{ suggestion }}
+      </button>
+    </div>
+  </div>
+</template>
diff --git a/client/src/features/book/components/FilterFormatPicker.vue b/client/src/features/book/components/FilterFormatPicker.vue
new file mode 100644
index 000000000..611330519
--- /dev/null
+++ b/client/src/features/book/components/FilterFormatPicker.vue
@@ -0,0 +1,39 @@
+<script setup lang="ts">
+import { BOOK_FORMATS } from '@projectx/types'
+
+const props = defineProps<{
+  modelValue: string[]
+}>()
+
+const emit = defineEmits<{ 'update:modelValue': [value: string[]] }>()
+
+function toggle(format: string) {
+  if (props.modelValue.includes(format)) {
+    emit(
+      'update:modelValue',
+      props.modelValue.filter((f) => f !== format),
+    )
+  } else {
+    emit('update:modelValue', [...props.modelValue, format])
+  }
+}
+</script>
+
+<template>
+  <div class="flex flex-wrap items-center gap-1">
+    <button
+      v-for="format in BOOK_FORMATS"
+      :key="format"
+      type="button"
+      class="h-7 px-2.5 rounded-md border text-xs font-medium uppercase tracking-wide transition-colors"
+      :class="
+        modelValue.includes(format)
+          ? 'border-primary bg-primary/15 text-primary'
+          : 'border-input bg-background text-muted-foreground hover:text-foreground hover:border-foreground/40'
+      "
+      @click="toggle(format)"
+    >
+      {{ format }}
+    </button>
+  </div>
+</template>
diff --git a/client/src/features/book/components/FilterSummary.vue b/client/src/features/book/components/FilterSummary.vue
new file mode 100644
index 000000000..954d3c495
--- /dev/null
+++ b/client/src/features/book/components/FilterSummary.vue
@@ -0,0 +1,49 @@
+<script setup lang="ts">
+import type { GroupRule, Rule } from '@projectx/types'
+import { ruleToParts } from '@/features/book/lib/filter-labels'
+
+defineProps<{
+  node: GroupRule
+  depth?: number
+}>()
+</script>
+
+<template>
+  <span class="inline-flex flex-wrap items-center gap-1">
+    <span
+      class="text-[9px] font-bold uppercase tracking-widest px-1.5 py-0.5 rounded shrink-0"
+      :class="node.join === 'OR' ? 'bg-amber-500/15 text-amber-500' : 'bg-sky-500/15 text-sky-500'"
+    >
+      {{ node.join === 'AND' ? 'ALL' : 'ANY' }}
+    </span>
+
+    <template v-for="(rule, i) in node.rules" :key="i">
+      <span v-if="i > 0" class="text-[10px] text-muted-foreground/40 font-medium select-none">
+        {{ node.join === 'AND' ? '·' : '|' }}
+      </span>
+
+      <!-- Leaf rule: color-coded field / operator / value -->
+      <span
+        v-if="rule.type === 'rule'"
+        class="inline-flex items-center gap-1 text-xs px-2 py-0.5 rounded-full border bg-muted/40 border-border/60"
+      >
+        <span class="font-semibold text-foreground">{{ ruleToParts(rule as Rule).field }}</span>
+        <span
+          class="font-normal"
+          :class="ruleToParts(rule as Rule).value === null ? 'text-primary font-semibold' : 'text-muted-foreground'"
+        >{{ ruleToParts(rule as Rule).operator }}</span>
+        <span v-if="ruleToParts(rule as Rule).value !== null" class="font-semibold text-primary">
+          {{ ruleToParts(rule as Rule).value }}
+        </span>
+      </span>
+
+      <!-- Nested group -->
+      <span
+        v-else
+        class="inline-flex flex-wrap items-center gap-1 px-2 py-0.5 rounded-lg border border-border/50 bg-muted/30"
+      >
+        <FilterSummary :node="rule as GroupRule" :depth="(depth ?? 0) + 1" />
+      </span>
+    </template>
+  </span>
+</template>
diff --git a/client/src/features/book/components/FilterTextTypeahead.vue b/client/src/features/book/components/FilterTextTypeahead.vue
new file mode 100644
index 000000000..d8f51e61e
--- /dev/null
+++ b/client/src/features/book/components/FilterTextTypeahead.vue
@@ -0,0 +1,105 @@
+<script setup lang="ts">
+import { onUnmounted, ref, watch } from 'vue'
+import { api } from '@/lib/api'
+
+const props = defineProps<{
+  modelValue: string
+  endpoint: string
+  placeholder?: string
+}>()
+
+const emit = defineEmits<{ 'update:modelValue': [value: string] }>()
+
+const suggestions = ref<string[]>([])
+const showDropdown = ref(false)
+const activeIndex = ref(-1)
+let debounceTimer: ReturnType<typeof setTimeout> | null = null
+let latestRequestId = 0
+
+watch(
+  () => props.modelValue,
+  (q) => {
+    if (debounceTimer) clearTimeout(debounceTimer)
+    if (!q.trim()) {
+      suggestions.value = []
+      showDropdown.value = false
+      return
+    }
+    debounceTimer = setTimeout(async () => {
+      const requestId = ++latestRequestId
+      const res = await api(`${props.endpoint}?q=${encodeURIComponent(q)}`)
+      if (requestId !== latestRequestId) return
+      if (!res.ok) return
+      const data: { name: string }[] = await res.json()
+      suggestions.value = data.map((d) => d.name)
+      showDropdown.value = suggestions.value.length > 0
+      activeIndex.value = -1
+    }, 200)
+  },
+)
+
+onUnmounted(() => {
+  if (debounceTimer) clearTimeout(debounceTimer)
+  latestRequestId = -1
+})
+
+function select(value: string) {
+  emit('update:modelValue', value)
+  showDropdown.value = false
+}
+
+function onInput(e: Event) {
+  emit('update:modelValue', (e.target as HTMLInputElement).value)
+}
+
+function onKeydown(e: KeyboardEvent) {
+  if (e.key === 'ArrowDown') {
+    e.preventDefault()
+    activeIndex.value = Math.min(activeIndex.value + 1, suggestions.value.length - 1)
+  } else if (e.key === 'ArrowUp') {
+    e.preventDefault()
+    activeIndex.value = Math.max(activeIndex.value - 1, -1)
+  } else if (e.key === 'Enter' && activeIndex.value >= 0) {
+    e.preventDefault()
+    const s = suggestions.value[activeIndex.value]
+    if (s) select(s)
+  } else if (e.key === 'Escape') {
+    showDropdown.value = false
+  }
+}
+
+function onBlur() {
+  setTimeout(() => {
+    showDropdown.value = false
+  }, 150)
+}
+</script>
+
+<template>
+  <div class="relative flex-1 min-w-32">
+    <input
+      :value="modelValue"
+      type="text"
+      :placeholder="placeholder ?? 'value'"
+      class="h-9 w-full rounded-md border border-input bg-background text-foreground text-sm px-2 focus:outline-none focus:ring-2 focus:ring-primary placeholder:text-muted-foreground"
+      @input="onInput"
+      @keydown="onKeydown"
+      @blur="onBlur"
+    />
+    <div
+      v-if="showDropdown"
+      class="absolute top-full left-0 mt-1 z-50 w-full min-w-40 max-h-48 overflow-y-auto rounded-md border border-border bg-popover shadow-md"
+    >
+      <button
+        v-for="(suggestion, i) in suggestions"
+        :key="suggestion"
+        type="button"
+        class="w-full text-left px-3 py-1.5 text-sm text-foreground hover:bg-accent transition-colors"
+        :class="{ 'bg-accent': i === activeIndex }"
+        @mousedown.prevent="select(suggestion)"
+      >
+        {{ suggestion }}
+      </button>
+    </div>
+  </div>
+</template>
diff --git a/client/src/features/book/lib/filter-labels.ts b/client/src/features/book/lib/filter-labels.ts
index 0d9a0a14e..95ca24fd7 100644
--- a/client/src/features/book/lib/filter-labels.ts
+++ b/client/src/features/book/lib/filter-labels.ts
@@ -6,6 +6,7 @@ export const SORT_FIELD_LABELS: Record<SortField, string> = {
   series: 'Series',
   seriesIndex: 'Series #',
   addedAt: 'Date Added',
+  updatedAt: 'Date Updated',
   publishedYear: 'Published Year',
   pageCount: 'Page Count',
 }
@@ -20,6 +21,8 @@ export const FIELD_LABELS: Record<RuleField, string> = {
   pageCount: 'Page Count',
   author: 'Author',
   genre: 'Genre',
+  tag: 'Tag',
+  collection: 'Collection',
   format: 'Format',
   addedAt: 'Added Date',
   fileAvailability: 'File Availability',
@@ -48,7 +51,7 @@ export const OPERATOR_LABELS: Record<RuleOperator, string> = {
   excludesAll: 'excludes all of',
   before: 'before',
   after: 'after',
-  withinLast: 'within last (days)',
+  withinLast: 'within last',
   isMissing: 'is missing',
   isPresent: 'is present',
   isUnread: 'is unread',
@@ -56,13 +59,14 @@ export const OPERATOR_LABELS: Record<RuleOperator, string> = {
   isFinished: 'is finished',
 }
 
-const NO_VALUE_OPS: RuleOperator[] = ['isEmpty', 'isNotEmpty']
+const NO_VALUE_OPS: RuleOperator[] = ['isEmpty', 'isNotEmpty', 'isMissing', 'isPresent', 'isUnread', 'isInProgress', 'isFinished']
 
-export function ruleToLabel(rule: Rule): string {
+export function ruleToParts(rule: Rule): { field: string; operator: string; value: string | null } {
   const field = FIELD_LABELS[rule.field] ?? rule.field
-  const op = OPERATOR_LABELS[rule.operator] ?? rule.operator
-  if (NO_VALUE_OPS.includes(rule.operator)) return `${field} ${op}`
+  const operator = OPERATOR_LABELS[rule.operator] ?? rule.operator
+  if (NO_VALUE_OPS.includes(rule.operator)) return { field, operator, value: null }
+  if (rule.operator === 'withinLast') return { field, operator, value: `${rule.value} days` }
   const val = Array.isArray(rule.value) ? (rule.value as string[]).join(', ') : String(rule.value ?? '')
-  if (rule.valueTo !== undefined) return `${field} ${op} ${val} - ${rule.valueTo}`
-  return `${field} ${op} ${val}`
+  return { field, operator, value: rule.valueTo !== undefined ? `${val} - ${rule.valueTo}` : val }
 }
+
diff --git a/client/src/views/LensView.vue b/client/src/views/LensView.vue
index 03afb6d82..28ed8892f 100644
--- a/client/src/views/LensView.vue
+++ b/client/src/views/LensView.vue
@@ -1,7 +1,7 @@
 <script setup lang="ts">
 import { computed, onMounted, onUnmounted, ref, watch } from 'vue'
 import { useRoute, useRouter } from 'vue-router'
-import { Settings2, Trash2 } from 'lucide-vue-next'
+import { Settings2, Trash2, ChevronDown, ChevronUp, ArrowUpDown } from 'lucide-vue-next'
 import BookCoverCard from '@/features/book/components/BookCoverCard.vue'
 import BookListRow from '@/features/book/components/BookListRow.vue'
 import BookQuickView from '@/features/book/components/BookQuickView.vue'
@@ -19,7 +19,8 @@ import { useLenses } from '@/features/lens/composables/useLenses'
 import { useDisplaySettings } from '@/composables/useDisplaySettings'
 import { useBookSelection } from '@/features/book/composables/useBookSelection'
 import { BACKGROUND_OPTIONS, useThemeStore } from '@/stores/theme'
-import { SORT_FIELD_LABELS, ruleToLabel } from '@/features/book/lib/filter-labels'
+import FilterSummary from '@/features/book/components/FilterSummary.vue'
+import { SORT_FIELD_LABELS } from '@/features/book/lib/filter-labels'
 import type { BookCard, GroupRule, SortField } from '@projectx/types'
 
 const route = useRoute()
@@ -33,30 +34,16 @@ const lensId = computed(() => Number(route.params.id))
 const { items: books, total, loading, hasMore, load } = useLens(lensId)
 const { lenses, fetchLenses, deleteLens } = useLenses()
 
-function collectRuleChips(node: GroupRule): string[] {
-  const chips: string[] = []
-  for (const r of node.rules) {
-    if (r.type === 'rule') chips.push(ruleToLabel(r))
-    else chips.push(...collectRuleChips(r as GroupRule))
-  }
-  return chips
-}
-
 const lens = computed(() => lenses.value.find((l) => l.id === lensId.value))
 
-const ruleChips = computed<string[]>(() => {
-  const filter = lens.value?.filter
-  if (!filter) return []
-  return collectRuleChips(filter)
-})
-
 const sortChip = computed(() => {
   const specs = lens.value?.defaultSort
   if (!specs?.length) return null
   return specs.map((s) => `${SORT_FIELD_LABELS[s.field as SortField] ?? s.field} ${s.dir === 'asc' ? '↑' : '↓'}`).join(', ')
 })
 
-const joinLabel = computed(() => lens.value?.filter?.join ?? 'AND')
+const filterExpanded = ref(true)
+
 
 const { selectionMode, selectedIds, selectedCount, enterSelectionMode, exitSelectionMode, toggleBook, rangeSelectTo, isSelected } = useBookSelection()
 
@@ -213,6 +200,15 @@ watch(loading, (isLoading) => {
         @toggle-selection="toggleSelectionMode"
       >
         <template #actions>
+          <button
+            v-if="lens?.filter || sortChip"
+            @click="filterExpanded = !filterExpanded"
+            class="hidden md:flex items-center gap-1.5 h-8 px-3 rounded-md border border-input text-sm text-muted-foreground hover:text-foreground hover:bg-muted transition-colors"
+            :title="filterExpanded ? 'Hide filter' : 'Show filter'"
+          >
+            <component :is="filterExpanded ? ChevronUp : ChevronDown" :size="13" />
+            <span>Filter</span>
+          </button>
           <button
             @click="editorOpen = true; confirmDelete = false"
             class="hidden md:flex items-center gap-1.5 h-8 px-3 rounded-md border border-input text-sm text-muted-foreground hover:text-foreground hover:bg-muted transition-colors"
@@ -237,23 +233,18 @@ watch(loading, (isLoading) => {
       </ViewHeader>
 
       <main class="flex-1 overflow-y-auto px-4 py-4" :class="backgroundClass">
-        <!-- Rule chips -->
-        <div v-if="ruleChips.length > 0 || sortChip" class="flex flex-wrap items-center gap-1.5 mb-4 cursor-pointer" @click="editorOpen = true">
-          <template v-if="ruleChips.length > 0">
-            <span
-              v-for="(chip, i) in ruleChips"
-              :key="i"
-              class="flex items-center gap-1 text-xs px-2.5 py-1 rounded-full bg-primary/8 border border-primary/20 text-primary font-medium hover:bg-primary/15 transition-colors"
-            >
-              {{ chip }}
-            </span>
-            <span v-if="ruleChips.length > 1" class="text-[10px] text-muted-foreground px-1"> ({{ joinLabel }}) </span>
-          </template>
+        <!-- Filter summary -->
+        <div v-if="filterExpanded && (lens?.filter || sortChip)" class="flex flex-wrap items-center gap-2 mb-4 cursor-pointer" @click="editorOpen = true">
+          <FilterSummary v-if="lens?.filter" :node="(lens.filter as GroupRule)" />
           <span
             v-if="sortChip"
-            class="text-xs px-2.5 py-1 rounded-full bg-muted border border-border text-muted-foreground hover:bg-muted/80 transition-colors"
+            class="inline-flex items-center text-xs rounded-md border border-border/60 overflow-hidden"
           >
-            Sort: {{ sortChip }}
+            <span class="inline-flex items-center gap-1 px-2 py-0.5 bg-muted text-muted-foreground border-r border-border/60">
+              <ArrowUpDown :size="10" class="shrink-0" />
+              <span class="font-semibold">Sort</span>
+            </span>
+            <span class="px-2 py-0.5 bg-muted/40 text-foreground font-medium">{{ sortChip }}</span>
           </span>
         </div>
 
diff --git a/package.json b/package.json
index e945daac5..296967452 100644
--- a/package.json
+++ b/package.json
@@ -8,7 +8,9 @@
     "build:client": "pnpm --filter client build",
     "build:server": "pnpm --filter server build",
     "lint": "pnpm -r lint",
-    "test": "pnpm -r test"
+    "test": "pnpm -r test",
+    "db:reset": "bash scripts/db/reset.sh",
+    "db:seed": "bash scripts/postman/seed.sh"
   },
   "engines": {
     "node": ">=24",
diff --git a/packages/types/src/book.ts b/packages/types/src/book.ts
index 6dfd6b8ab..030d50c55 100644
--- a/packages/types/src/book.ts
+++ b/packages/types/src/book.ts
@@ -1,5 +1,8 @@
 import type { MetadataProviderKey } from './metadata-fetch';
 
+export const BOOK_FORMATS = ['epub', 'pdf', 'mobi', 'azw3', 'cbz', 'cbr', 'cb7', 'fb2'] as const;
+export type BookFormat = (typeof BOOK_FORMATS)[number];
+
 export type BookFileRef = {
   id: number;
   format: string | null;
diff --git a/packages/types/src/query.ts b/packages/types/src/query.ts
index a4e74ef3d..6c8bbb094 100644
--- a/packages/types/src/query.ts
+++ b/packages/types/src/query.ts
@@ -8,6 +8,8 @@ export type RuleField =
   | 'pageCount'
   | 'author'
   | 'genre'
+  | 'tag'
+  | 'collection'
   | 'format'
   | 'addedAt'
   | 'fileAvailability'
@@ -44,11 +46,13 @@ export type RuleOperator =
 
 export const FIELD_OPERATORS: Record<RuleField, RuleOperator[]> = {
   title: ['contains', 'notContains', 'startsWith', 'endsWith', 'eq', 'notEq', 'isEmpty', 'isNotEmpty'],
-  publisher: ['contains', 'notContains', 'isEmpty', 'isNotEmpty'],
-  language: ['eq', 'notEq', 'isEmpty', 'isNotEmpty'],
-  series: ['contains', 'notContains', 'isEmpty', 'isNotEmpty'],
+  publisher: ['contains', 'notContains', 'eq', 'notEq', 'includesAny', 'excludesAll', 'isEmpty', 'isNotEmpty'],
+  language: ['eq', 'notEq', 'includesAny', 'excludesAll', 'isEmpty', 'isNotEmpty'],
+  series: ['contains', 'notContains', 'eq', 'notEq', 'includesAny', 'excludesAll', 'isEmpty', 'isNotEmpty'],
   author: ['includesAny', 'includesAll', 'excludesAll', 'isEmpty', 'isNotEmpty'],
   genre: ['includesAny', 'includesAll', 'excludesAll', 'isEmpty', 'isNotEmpty'],
+  tag: ['includesAny', 'includesAll', 'excludesAll', 'isEmpty', 'isNotEmpty'],
+  collection: ['includesAny', 'excludesAll', 'isEmpty', 'isNotEmpty'],
   format: ['includesAny', 'excludesAll'],
   publishedYear: ['eq', 'notEq', 'gt', 'gte', 'lt', 'lte', 'between', 'isEmpty', 'isNotEmpty'],
   seriesIndex: ['eq', 'notEq', 'gt', 'gte', 'lt', 'lte', 'between', 'isEmpty', 'isNotEmpty'],
@@ -104,9 +108,9 @@ export type GroupRule = {
   rules: (Rule | GroupRule)[]
 }
 
-export type SortField = 'author' | 'title' | 'series' | 'seriesIndex' | 'addedAt' | 'publishedYear' | 'pageCount'
+export type SortField = 'author' | 'title' | 'series' | 'seriesIndex' | 'addedAt' | 'updatedAt' | 'publishedYear' | 'pageCount'
 
-export const SORT_FIELDS: SortField[] = ['author', 'title', 'series', 'seriesIndex', 'addedAt', 'publishedYear', 'pageCount']
+export const SORT_FIELDS: SortField[] = ['author', 'title', 'series', 'seriesIndex', 'addedAt', 'updatedAt', 'publishedYear', 'pageCount']
 
 export type SortSpec = {
   field: SortField
diff --git a/server/src/db/migrations/0000_baseline.sql b/server/src/db/migrations/0000_baseline.sql
index c3cf1488d..8b15a8164 100644
--- a/server/src/db/migrations/0000_baseline.sql
+++ b/server/src/db/migrations/0000_baseline.sql
@@ -568,6 +568,8 @@ CREATE UNIQUE INDEX "email_templates_system_name_unique" ON "email_templates" US
 CREATE INDEX "authors_name_trgm_idx" ON "authors" USING gin ("name" gin_trgm_ops);--> statement-breakpoint
 CREATE INDEX "bm_title_trgm_idx" ON "book_metadata" USING gin ("title" gin_trgm_ops);--> statement-breakpoint
 CREATE INDEX "bm_series_trgm_idx" ON "book_metadata" USING gin ("series_name" gin_trgm_ops);--> statement-breakpoint
+CREATE INDEX "bm_publisher_trgm_idx" ON "book_metadata" USING gin ("publisher" gin_trgm_ops);--> statement-breakpoint
+CREATE INDEX "bm_language_idx" ON "book_metadata" USING btree ("language");--> statement-breakpoint
 CREATE INDEX "annotations_user_id_idx" ON "annotations" USING btree ("user_id");--> statement-breakpoint
 CREATE INDEX "bookmarks_user_id_idx" ON "bookmarks" USING btree ("user_id");--> statement-breakpoint
 CREATE UNIQUE INDEX "rdp_user_format_idx" ON "reader_default_preferences" USING btree ("user_id","format_group");--> statement-breakpoint
diff --git a/server/src/db/migrations/meta/0000_snapshot.json b/server/src/db/migrations/meta/0000_snapshot.json
index fae9e46de..4659aa2b7 100644
--- a/server/src/db/migrations/meta/0000_snapshot.json
+++ b/server/src/db/migrations/meta/0000_snapshot.json
@@ -1,5 +1,5 @@
 {
-  "id": "9b81eebf-1c40-4c73-baad-cd6109207d0f",
+  "id": "d6367e5a-0f2b-4a49-9291-83caa87aa6f8",
   "prevId": "00000000-0000-0000-0000-000000000000",
   "version": "7",
   "dialect": "postgresql",
@@ -2426,6 +2426,37 @@
           "concurrently": false,
           "method": "gin",
           "with": {}
+        },
+        "bm_publisher_trgm_idx": {
+          "name": "bm_publisher_trgm_idx",
+          "columns": [
+            {
+              "expression": "publisher",
+              "isExpression": false,
+              "asc": true,
+              "nulls": "last",
+              "opclass": "gin_trgm_ops"
+            }
+          ],
+          "isUnique": false,
+          "concurrently": false,
+          "method": "gin",
+          "with": {}
+        },
+        "bm_language_idx": {
+          "name": "bm_language_idx",
+          "columns": [
+            {
+              "expression": "language",
+              "isExpression": false,
+              "asc": true,
+              "nulls": "last"
+            }
+          ],
+          "isUnique": false,
+          "concurrently": false,
+          "method": "btree",
+          "with": {}
         }
       },
       "foreignKeys": {
diff --git a/server/src/db/migrations/meta/_journal.json b/server/src/db/migrations/meta/_journal.json
index 771e22b2c..072e87163 100644
--- a/server/src/db/migrations/meta/_journal.json
+++ b/server/src/db/migrations/meta/_journal.json
@@ -5,7 +5,7 @@
     {
       "idx": 0,
       "version": "7",
-      "when": 1772457969998,
+      "when": 1772527273328,
       "tag": "0000_baseline",
       "breakpoints": true
     }
diff --git a/server/src/db/schema/metadata.ts b/server/src/db/schema/metadata.ts
index f5da6ceec..720198be0 100644
--- a/server/src/db/schema/metadata.ts
+++ b/server/src/db/schema/metadata.ts
@@ -38,6 +38,8 @@ export const bookMetadata = pgTable(
   (t) => [
     index('bm_title_trgm_idx').using('gin', t.title.op('gin_trgm_ops')),
     index('bm_series_trgm_idx').using('gin', t.seriesName.op('gin_trgm_ops')),
+    index('bm_publisher_trgm_idx').using('gin', t.publisher.op('gin_trgm_ops')),
+    index('bm_language_idx').on(t.language),
   ],
 );
 
@@ -48,9 +50,7 @@ export const authors = pgTable(
     name: varchar('name', { length: 500 }).notNull(),
     sortName: varchar('sort_name', { length: 500 }),
   },
-  (t) => [
-    index('authors_name_trgm_idx').using('gin', t.name.op('gin_trgm_ops')),
-  ],
+  (t) => [index('authors_name_trgm_idx').using('gin', t.name.op('gin_trgm_ops'))],
 );
 
 export const bookAuthors = pgTable(
diff --git a/server/src/modules/book/book-query-builder.service.ts b/server/src/modules/book/book-query-builder.service.ts
index 2ade2ba57..a715521b4 100644
--- a/server/src/modules/book/book-query-builder.service.ts
+++ b/server/src/modules/book/book-query-builder.service.ts
@@ -5,7 +5,20 @@ import { NodePgDatabase } from 'drizzle-orm/node-postgres';
 import type { GroupRule, Rule, SortField, SortSpec } from '@projectx/types';
 import { DB } from '../../db';
 import * as schema from '../../db/schema';
-import { authors, bookAuthors, bookFiles, bookGenres, bookMetadata, books, readingProgress, genres } from '../../db/schema';
+import {
+  authors,
+  bookAuthors,
+  bookFiles,
+  bookGenres,
+  bookMetadata,
+  books,
+  bookTags,
+  collectionBooks,
+  collections,
+  readingProgress,
+  genres,
+  tags,
+} from '../../db/schema';
 
 type Db = NodePgDatabase<typeof schema>;
 
@@ -14,6 +27,7 @@ const SORT_FIELD_MAP: Partial<Record<SortField, AnyColumn>> = {
   series: bookMetadata.seriesName,
   seriesIndex: bookMetadata.seriesIndex,
   addedAt: books.addedAt,
+  updatedAt: books.updatedAt,
   publishedYear: bookMetadata.publishedYear,
   pageCount: bookMetadata.pageCount,
 };
@@ -77,11 +91,17 @@ export class BookQueryBuilder {
       case 'title':
         return this.textRuleToSql(bookMetadata.title, operator, value as string);
       case 'publisher':
-        return this.textRuleToSql(bookMetadata.publisher, operator, value as string);
+        return Array.isArray(value)
+          ? this.textSetRuleToSql(bookMetadata.publisher, operator, value as string[])
+          : this.textRuleToSql(bookMetadata.publisher, operator, value as string);
       case 'language':
-        return this.textRuleToSql(bookMetadata.language, operator, value as string);
+        return Array.isArray(value)
+          ? this.textSetRuleToSql(bookMetadata.language, operator, value as string[])
+          : this.textRuleToSql(bookMetadata.language, operator, value as string);
       case 'series':
-        return this.textRuleToSql(bookMetadata.seriesName, operator, value as string);
+        return Array.isArray(value)
+          ? this.textSetRuleToSql(bookMetadata.seriesName, operator, value as string[])
+          : this.textRuleToSql(bookMetadata.seriesName, operator, value as string);
       case 'publishedYear':
         return this.numericRuleToSql(bookMetadata.publishedYear, operator, value as number, valueTo as number | undefined);
       case 'seriesIndex':
@@ -94,6 +114,10 @@ export class BookQueryBuilder {
         return this.authorRuleToSql(operator, value as string[]);
       case 'genre':
         return this.genreRuleToSql(operator, value as string[]);
+      case 'tag':
+        return this.tagRuleToSql(operator, value as string[]);
+      case 'collection':
+        return this.collectionRuleToSql(operator, value as string[], userId);
       case 'format':
         return this.formatRuleToSql(operator, value as string[]);
       case 'addedAt':
@@ -138,6 +162,19 @@ export class BookQueryBuilder {
     }
   }
 
+  private textSetRuleToSql(col: AnyColumn, operator: string, values?: string[]): SQL {
+    switch (operator) {
+      case 'includesAny':
+        if (!values?.length) return sql`1 = 0`;
+        return inArray(col, values);
+      case 'excludesAll':
+        if (!values?.length) return sql`1 = 1`;
+        return or(isNull(col), not(inArray(col, values)))!;
+      default:
+        throw new BadRequestException(`Invalid operator '${operator}' for text set field`);
+    }
+  }
+
   private numericRuleToSql(col: AnyColumn, operator: string, value?: number, valueTo?: number): SQL {
     switch (operator) {
       case 'eq':
@@ -274,6 +311,54 @@ export class BookQueryBuilder {
     }
   }
 
+  private tagRuleToSql(operator: string, values?: string[]): SQL {
+    const sq = (whereClause?: SQL) =>
+      this.db.select({ bookId: bookTags.bookId }).from(bookTags).innerJoin(tags, eq(bookTags.tagId, tags.id)).where(whereClause);
+
+    switch (operator) {
+      case 'includesAny':
+        if (!values?.length) return sql`1 = 0`;
+        return inArray(books.id, sq(or(...values.map((v) => eq(tags.name, v)))));
+      case 'includesAll':
+        if (!values?.length) return sql`1 = 0`;
+        return and(...values.map((v) => inArray(books.id, sq(eq(tags.name, v)))))!;
+      case 'excludesAll':
+        if (!values?.length) return sql`1 = 1`;
+        return not(inArray(books.id, sq(or(...values.map((v) => eq(tags.name, v))))));
+      case 'isEmpty':
+        return not(inArray(books.id, sq()));
+      case 'isNotEmpty':
+        return inArray(books.id, sq());
+      default:
+        throw new BadRequestException(`Invalid operator '${operator}' for tag field`);
+    }
+  }
+
+  private collectionRuleToSql(operator: string, values?: string[], userId?: number): SQL {
+    if (userId === undefined) throw new BadRequestException('Collection filter requires an authenticated user');
+    const sq = (whereClause?: SQL) =>
+      this.db
+        .select({ bookId: collectionBooks.bookId })
+        .from(collectionBooks)
+        .innerJoin(collections, and(eq(collectionBooks.collectionId, collections.id), eq(collections.userId, userId)))
+        .where(whereClause);
+
+    switch (operator) {
+      case 'includesAny':
+        if (!values?.length) return sql`1 = 0`;
+        return inArray(books.id, sq(or(...values.map((v) => eq(collections.name, v)))));
+      case 'excludesAll':
+        if (!values?.length) return sql`1 = 1`;
+        return not(inArray(books.id, sq(or(...values.map((v) => eq(collections.name, v))))));
+      case 'isEmpty':
+        return not(inArray(books.id, sq()));
+      case 'isNotEmpty':
+        return inArray(books.id, sq());
+      default:
+        throw new BadRequestException(`Invalid operator '${operator}' for collection field`);
+    }
+  }
+
   private isbnRuleToSql(operator: string, value?: string): SQL {
     switch (operator) {
       case 'isEmpty':
diff --git a/server/src/modules/book/utils/group-rule.validator.ts b/server/src/modules/book/utils/group-rule.validator.ts
index 276882b2e..8b156d56e 100644
--- a/server/src/modules/book/utils/group-rule.validator.ts
+++ b/server/src/modules/book/utils/group-rule.validator.ts
@@ -15,6 +15,8 @@ const RULE_FIELDS = [
   'pageCount',
   'author',
   'genre',
+  'tag',
+  'collection',
   'format',
   'addedAt',
   'fileAvailability',
@@ -52,11 +54,13 @@ const RULE_OPERATORS = [
 
 const VALID_OPERATORS_BY_FIELD: Record<string, string[]> = {
   title: ['contains', 'notContains', 'startsWith', 'endsWith', 'eq', 'notEq', 'isEmpty', 'isNotEmpty'],
-  publisher: ['contains', 'notContains', 'isEmpty', 'isNotEmpty'],
-  language: ['eq', 'notEq', 'isEmpty', 'isNotEmpty'],
-  series: ['contains', 'notContains', 'isEmpty', 'isNotEmpty'],
+  publisher: ['contains', 'notContains', 'eq', 'notEq', 'includesAny', 'excludesAll', 'isEmpty', 'isNotEmpty'],
+  language: ['eq', 'notEq', 'includesAny', 'excludesAll', 'isEmpty', 'isNotEmpty'],
+  series: ['contains', 'notContains', 'eq', 'notEq', 'includesAny', 'excludesAll', 'isEmpty', 'isNotEmpty'],
   author: ['includesAny', 'includesAll', 'excludesAll', 'isEmpty', 'isNotEmpty'],
   genre: ['includesAny', 'includesAll', 'excludesAll', 'isEmpty', 'isNotEmpty'],
+  tag: ['includesAny', 'includesAll', 'excludesAll', 'isEmpty', 'isNotEmpty'],
+  collection: ['includesAny', 'excludesAll', 'isEmpty', 'isNotEmpty'],
   format: ['includesAny', 'excludesAll'],
   publishedYear: ['eq', 'notEq', 'gt', 'gte', 'lt', 'lte', 'between', 'isEmpty', 'isNotEmpty'],
   seriesIndex: ['eq', 'notEq', 'gt', 'gte', 'lt', 'lte', 'between', 'isEmpty', 'isNotEmpty'],
diff --git a/server/src/modules/catalog/catalog.controller.ts b/server/src/modules/catalog/catalog.controller.ts
index 4275bb19d..7e8327fa5 100644
--- a/server/src/modules/catalog/catalog.controller.ts
+++ b/server/src/modules/catalog/catalog.controller.ts
@@ -1,5 +1,6 @@
 import { Controller, Get, Query } from '@nestjs/common';
 
+import { CurrentUser } from '../../common/decorators/current-user.decorator';
 import { CatalogService } from './catalog.service';
 
 @Controller('metadata')
@@ -20,4 +21,24 @@ export class CatalogController {
   searchTags(@Query('q') q = '') {
     return this.catalogService.searchTags(q);
   }
+
+  @Get('publishers')
+  searchPublishers(@Query('q') q = '') {
+    return this.catalogService.searchPublishers(q);
+  }
+
+  @Get('series')
+  searchSeries(@Query('q') q = '') {
+    return this.catalogService.searchSeries(q);
+  }
+
+  @Get('languages')
+  searchLanguages(@Query('q') q = '') {
+    return this.catalogService.searchLanguages(q);
+  }
+
+  @Get('collections')
+  searchCollections(@CurrentUser() user: { id: number }, @Query('q') q = '') {
+    return this.catalogService.searchCollections(user.id, q);
+  }
 }
diff --git a/server/src/modules/catalog/catalog.service.ts b/server/src/modules/catalog/catalog.service.ts
index 176c12eb6..5e6cc22d8 100644
--- a/server/src/modules/catalog/catalog.service.ts
+++ b/server/src/modules/catalog/catalog.service.ts
@@ -1,10 +1,10 @@
 import { Inject, Injectable } from '@nestjs/common';
-import { ilike } from 'drizzle-orm';
+import { and, eq, ilike, isNotNull } from 'drizzle-orm';
 import { NodePgDatabase } from 'drizzle-orm/node-postgres';
 
 import { DB } from '../../db';
 import * as schema from '../../db/schema';
-import { authors, genres, tags } from '../../db/schema';
+import { authors, bookMetadata, collections, genres, tags } from '../../db/schema';
 
 type Db = NodePgDatabase<typeof schema>;
 
@@ -12,22 +12,58 @@ type Db = NodePgDatabase<typeof schema>;
 export class CatalogService {
   constructor(@Inject(DB) private readonly db: Db) {}
 
-  searchAuthors(q: string) {
+  searchAuthors(q: string): Promise<{ name: string }[]> {
     return this.searchByName(q, authors);
   }
 
-  searchGenres(q: string) {
+  searchGenres(q: string): Promise<{ name: string }[]> {
     return this.searchByName(q, genres);
   }
 
-  searchTags(q: string) {
+  searchTags(q: string): Promise<{ name: string }[]> {
     return this.searchByName(q, tags);
   }
 
-  private searchByName(q: string, table: typeof authors | typeof genres | typeof tags): Promise<{ id: number; name: string }[]> {
+  searchPublishers(q: string): Promise<{ name: string }[]> {
     if (!q.trim()) return Promise.resolve([]);
     return this.db
-      .select({ id: table.id, name: table.name })
+      .selectDistinct({ name: bookMetadata.publisher })
+      .from(bookMetadata)
+      .where(and(isNotNull(bookMetadata.publisher), ilike(bookMetadata.publisher, `%${q}%`)))
+      .orderBy(bookMetadata.publisher)
+      .limit(15) as Promise<{ name: string }[]>;
+  }
+
+  searchSeries(q: string): Promise<{ name: string }[]> {
+    if (!q.trim()) return Promise.resolve([]);
+    return this.db
+      .selectDistinct({ name: bookMetadata.seriesName })
+      .from(bookMetadata)
+      .where(and(isNotNull(bookMetadata.seriesName), ilike(bookMetadata.seriesName, `%${q}%`)))
+      .orderBy(bookMetadata.seriesName)
+      .limit(15) as Promise<{ name: string }[]>;
+  }
+
+  searchLanguages(q: string): Promise<{ name: string }[]> {
+    if (!q.trim()) return Promise.resolve([]);
+    return this.db
+      .selectDistinct({ name: bookMetadata.language })
+      .from(bookMetadata)
+      .where(and(isNotNull(bookMetadata.language), ilike(bookMetadata.language, `%${q}%`)))
+      .orderBy(bookMetadata.language)
+      .limit(15) as Promise<{ name: string }[]>;
+  }
+
+  searchCollections(userId: number, q: string): Promise<{ name: string }[]> {
+    const baseWhere = eq(collections.userId, userId);
+    const where = q.trim() ? and(baseWhere, ilike(collections.name, `%${q}%`)) : baseWhere;
+    return this.db.select({ name: collections.name }).from(collections).where(where).orderBy(collections.name).limit(20);
+  }
+
+  private searchByName(q: string, table: typeof authors | typeof genres | typeof tags): Promise<{ name: string }[]> {
+    if (!q.trim()) return Promise.resolve([]);
+    return this.db
+      .select({ name: table.name })
       .from(table)
       .where(ilike(table.name, `%${q}%`))
       .orderBy(table.name)
diff --git a/server/src/modules/lens/lens.service.ts b/server/src/modules/lens/lens.service.ts
index 03b79b208..b668bf9ab 100644
--- a/server/src/modules/lens/lens.service.ts
+++ b/server/src/modules/lens/lens.service.ts
@@ -30,7 +30,7 @@ export class LensService {
     const accessibleLibraryIds = (libs as { id: number }[]).map((l) => l.id);
     return Promise.all(
       lenses.map(async (lens) => {
-        const where = this.queryBuilder.buildWhere(lens.filter as GroupRule | null, { accessibleLibraryIds });
+        const where = this.queryBuilder.buildWhere(lens.filter as GroupRule | null, { accessibleLibraryIds, userId: user.id });
         const bookCount = await this.bookRepo.countWhere(where);
         return { ...lens, bookCount };
       }),
@@ -93,7 +93,7 @@ export class LensService {
     const libs = await this.libraryService.findAll(user);
     const accessibleLibraryIds = (libs as { id: number }[]).map((l) => l.id);
 
-    const where = this.queryBuilder.buildWhere(lens.filter as GroupRule | null, { accessibleLibraryIds });
+    const where = this.queryBuilder.buildWhere(lens.filter as GroupRule | null, { accessibleLibraryIds, userId: user.id });
     const orderBy = this.queryBuilder.buildOrderBy((lens.defaultSort as SortSpec[]) ?? []);
     const { rows, authorRows, fileRows, genreRows, tagRows, progressRows, total } = await this.bookRepo.findCards({
       where,
diff --git a/server/src/modules/opds/opds-book.service.ts b/server/src/modules/opds/opds-book.service.ts
index 0f2aab27b..a38602b62 100644
--- a/server/src/modules/opds/opds-book.service.ts
+++ b/server/src/modules/opds/opds-book.service.ts
@@ -270,7 +270,7 @@ export class OpdsBookService {
     if (!lens) return { entries: [], total: 0 };
     if (!lens.isPublic && lens.userId !== userId) return { entries: [], total: 0 };
 
-    const where = this.queryBuilder.buildWhere(lens.filter as GroupRule | null, { accessibleLibraryIds: accessibleIds });
+    const where = this.queryBuilder.buildWhere(lens.filter as GroupRule | null, { accessibleLibraryIds: accessibleIds, userId });
     const statusClause = eq(books.status, 'present');
     const combinedWhere = where ? and(where, statusClause) : statusClause;
     return this.paginatedBookQuery(combinedWhere!, sortOrder, page, size);