diff --git a/apps/web/messages/en.json b/apps/web/messages/en.json
index ce22b11..c30f3fb 100644
--- a/apps/web/messages/en.json
+++ b/apps/web/messages/en.json
@@ -220,5 +220,15 @@
 	"manage_dissolve_confirm_button": "Dissolve permanently",
 	"sidebar_create_collective": "+ New collective",
 	"create_collective_modal_title": "New collective",
-	"create_collective_modal_button": "Create"
+	"create_collective_modal_button": "Create",
+	"tag_picker_placeholder": "Search or create tag",
+	"tag_picker_create": "Create \"{name}\"",
+	"tag_picker_empty": "No tags yet.",
+	"tag_picker_label": "Tags",
+	"list_filter_by_tag": "Filter by tag",
+	"list_filter_clear": "Clear",
+	"settings_tags_section": "Tags",
+	"settings_tags_empty": "No tags yet — create one from any list.",
+	"settings_tags_delete": "Delete",
+	"settings_tags_color": "Color"
 }
diff --git a/apps/web/messages/es.json b/apps/web/messages/es.json
index a601bd0..96da857 100644
--- a/apps/web/messages/es.json
+++ b/apps/web/messages/es.json
@@ -220,5 +220,15 @@
 	"manage_dissolve_confirm_button": "Disolver permanentemente",
 	"sidebar_create_collective": "+ Nuevo colectivo",
 	"create_collective_modal_title": "Nuevo colectivo",
-	"create_collective_modal_button": "Crear"
+	"create_collective_modal_button": "Crear",
+	"tag_picker_placeholder": "Buscar o crear etiqueta",
+	"tag_picker_create": "Crear «{name}»",
+	"tag_picker_empty": "Aún no hay etiquetas.",
+	"tag_picker_label": "Etiquetas",
+	"list_filter_by_tag": "Filtrar por etiqueta",
+	"list_filter_clear": "Limpiar",
+	"settings_tags_section": "Etiquetas",
+	"settings_tags_empty": "Aún no hay etiquetas — créalas desde cualquier lista.",
+	"settings_tags_delete": "Eliminar",
+	"settings_tags_color": "Color"
 }
diff --git a/apps/web/src/lib/components/TagChip.svelte b/apps/web/src/lib/components/TagChip.svelte
new file mode 100644
index 0000000..ac7587d
--- /dev/null
+++ b/apps/web/src/lib/components/TagChip.svelte
@@ -0,0 +1,67 @@
+<script lang="ts">
+	import { X } from 'lucide-svelte';
+	import type { ItemTagColor } from '@colectivo/types';
+
+	/**
+	 * Small pill that renders an item tag.
+	 *
+	 *   - default: display-only `<span>`
+	 *   - `onRemove`: renders the pill as a `<span>` with an inline X button
+	 *   - `onSelect`: renders the pill as a single `<button>` (used by the
+	 *     filter bar and item-row chips that filter the list on click)
+	 *
+	 * `onSelect` and `onRemove` are mutually exclusive — supplying both is a
+	 * programming error (nested `<button>` is invalid HTML and SvelteKit
+	 * warns about hydration mismatches). The picker-selected variant uses
+	 * `onRemove`; the filter-bar variant uses `onSelect`.
+	 */
+	interface Props {
+		name: string;
+		color: ItemTagColor;
+		onRemove?: () => void;
+		onSelect?: () => void;
+		active?: boolean;
+		testid?: string;
+	}
+
+	const { name, color, onRemove, onSelect, active = false, testid }: Props = $props();
+
+	// Tailwind cannot see dynamic class names — see tailwind.config.ts safelist.
+	const bg = $derived(`bg-${color}-100 dark:bg-${color}-900/40`);
+	const fg = $derived(`text-${color}-700 dark:text-${color}-200`);
+	const ring = $derived(active ? `ring-1 ring-${color}-200 dark:ring-${color}-700/50` : '');
+	const baseClasses = $derived(
+		`inline-flex items-center gap-1 rounded-full px-2 py-0.5 text-xs font-medium ${bg} ${fg} ${ring}`
+	);
+</script>
+
+{#if onSelect}
+	<button
+		type="button"
+		onclick={onSelect}
+		data-testid={testid ?? 'tag-chip'}
+		data-tag={name}
+		data-active={active ? 'true' : undefined}
+		class="{baseClasses} transition-opacity hover:opacity-90"
+	>
+		<span class="truncate">{name}</span>
+	</button>
+{:else}
+	<span
+		data-testid={testid ?? 'tag-chip'}
+		data-tag={name}
+		class={baseClasses}
+	>
+		<span class="truncate">{name}</span>
+		{#if onRemove}
+			<button
+				type="button"
+				onclick={onRemove}
+				aria-label="Remove"
+				class="-mr-0.5 rounded-full p-0.5 hover:bg-black/10 dark:hover:bg-white/10"
+			>
+				<X size={10} strokeWidth={2} />
+			</button>
+		{/if}
+	</span>
+{/if}
diff --git a/apps/web/src/lib/components/TagPicker.svelte b/apps/web/src/lib/components/TagPicker.svelte
new file mode 100644
index 0000000..49728dd
--- /dev/null
+++ b/apps/web/src/lib/components/TagPicker.svelte
@@ -0,0 +1,130 @@
+<script lang="ts">
+	import { Plus, Check } from 'lucide-svelte';
+	import TagChip from './TagChip.svelte';
+	import { filterTagOptions } from './tag-picker-filter';
+	import type { ItemTag, ItemTagColor } from '@colectivo/types';
+	import * as m from '$lib/paraglide/messages';
+
+	/**
+	 * Combobox-style picker for collective tags.
+	 *
+	 *   - filters `availableTags` by substring on `query`
+	 *   - shows a "Create `query`" affordance when no exact match exists
+	 *   - calls `onToggle(tag)` for an existing tag click (caller decides
+	 *     attach vs detach by reading whether `selectedIds` already has it)
+	 *   - calls `onCreate(name)` for a brand-new tag
+	 *
+	 * Pure UI — does not call the network itself. Re-usable from the item
+	 * modal (single-item attach/detach) and the list-filter bar (toggle
+	 * filter chips).
+	 */
+	interface Props {
+		availableTags: ItemTag[];
+		selectedIds: string[];
+		onToggle: (tag: ItemTag) => void | Promise<void>;
+		onCreate?: (name: string) => void | Promise<void>;
+		placeholder?: string;
+		showSelected?: boolean;
+	}
+
+	const {
+		availableTags,
+		selectedIds,
+		onToggle,
+		onCreate,
+		placeholder,
+		showSelected = true
+	}: Props = $props();
+
+	let query = $state('');
+	let inputEl: HTMLInputElement | undefined = $state();
+
+	const result = $derived(filterTagOptions(availableTags, query, selectedIds));
+	const selectedTags = $derived(availableTags.filter((t) => selectedIds.includes(t.id)));
+
+	async function handleCreate() {
+		if (!onCreate || !result.canCreate) return;
+		const name = result.createName;
+		await onCreate(name);
+		query = '';
+		inputEl?.focus();
+	}
+
+	async function handleToggle(tag: ItemTag) {
+		await onToggle(tag);
+		query = '';
+		inputEl?.focus();
+	}
+
+	function handleKeydown(e: KeyboardEvent) {
+		if (e.key === 'Enter') {
+			e.preventDefault();
+			// Prefer toggling the first match (mirrors typical combobox behaviour);
+			// fall back to creating a new tag when nothing matches.
+			if (result.matches.length > 0) {
+				void handleToggle(result.matches[0]);
+			} else if (result.canCreate) {
+				void handleCreate();
+			}
+		}
+	}
+</script>
+
+<div data-testid="tag-picker" class="space-y-2">
+	{#if showSelected && selectedTags.length > 0}
+		<div class="flex flex-wrap gap-1.5">
+			{#each selectedTags as tag (tag.id)}
+				<TagChip
+					name={tag.name}
+					color={tag.color as ItemTagColor}
+					onRemove={() => handleToggle(tag)}
+					testid="tag-picker-selected"
+				/>
+			{/each}
+		</div>
+	{/if}
+
+	<input
+		bind:this={inputEl}
+		bind:value={query}
+		onkeydown={handleKeydown}
+		type="text"
+		placeholder={placeholder ?? m.tag_picker_placeholder()}
+		data-testid="tag-picker-input"
+		class="w-full rounded-md bg-background px-3 py-2 text-sm text-text-primary outline-none ring-1 ring-black/10 focus:ring-slate-900 dark:ring-white/10 dark:focus:ring-slate-100"
+	/>
+
+	<div class="flex max-h-48 flex-col gap-1 overflow-y-auto" data-testid="tag-picker-options">
+		{#each result.matches as tag (tag.id)}
+			{@const isSelected = selectedIds.includes(tag.id)}
+			<button
+				type="button"
+				onclick={() => handleToggle(tag)}
+				data-testid="tag-picker-option"
+				data-tag={tag.name}
+				class="flex items-center gap-2 rounded-md px-2 py-1.5 text-left text-sm hover:bg-black/5 dark:hover:bg-white/5"
+			>
+				<TagChip name={tag.name} color={tag.color as ItemTagColor} />
+				{#if isSelected}
+					<Check size={14} strokeWidth={2} class="ml-auto text-text-secondary" />
+				{/if}
+			</button>
+		{/each}
+
+		{#if result.canCreate && onCreate}
+			<button
+				type="button"
+				onclick={handleCreate}
+				data-testid="tag-picker-create"
+				class="flex items-center gap-2 rounded-md px-2 py-1.5 text-left text-sm text-text-secondary hover:bg-black/5 dark:hover:bg-white/5"
+			>
+				<Plus size={14} strokeWidth={2} />
+				<span>{m.tag_picker_create({ name: result.createName })}</span>
+			</button>
+		{/if}
+
+		{#if result.matches.length === 0 && !result.canCreate}
+			<p class="px-2 py-1.5 text-xs text-text-muted">{m.tag_picker_empty()}</p>
+		{/if}
+	</div>
+</div>
diff --git a/apps/web/src/lib/components/tag-picker-filter.test.ts b/apps/web/src/lib/components/tag-picker-filter.test.ts
new file mode 100644
index 0000000..a7a5678
--- /dev/null
+++ b/apps/web/src/lib/components/tag-picker-filter.test.ts
@@ -0,0 +1,58 @@
+import { describe, it, expect } from 'vitest';
+import { filterTagOptions } from './tag-picker-filter';
+import type { ItemTag } from '@colectivo/types';
+
+function tag(name: string, id = name): ItemTag {
+	return {
+		id,
+		collective_id: 'c',
+		name,
+		color: 'slate',
+		created_at: '2026-05-18T00:00:00Z'
+	};
+}
+
+describe('filterTagOptions', () => {
+	const all = [tag('Vegano'), tag('Oferta'), tag('Vegetariano'), tag('Bio')];
+
+	it('TP-01: substring match is case-insensitive', () => {
+		const result = filterTagOptions(all, 'veg', []);
+		expect(result.matches.map((t) => t.name)).toEqual(['Vegano', 'Vegetariano']);
+	});
+
+	it('TP-02: returns the full list when query is empty', () => {
+		const result = filterTagOptions(all, '', []);
+		expect(result.matches).toHaveLength(4);
+		expect(result.canCreate).toBe(false);
+	});
+
+	it('TP-03: canCreate is true when the query is non-empty and no exact match exists', () => {
+		const result = filterTagOptions(all, 'Lácteo', []);
+		expect(result.canCreate).toBe(true);
+		expect(result.createName).toBe('Lácteo');
+	});
+
+	it('TP-04: canCreate is false when an exact (case-insensitive) match exists', () => {
+		const result = filterTagOptions(all, 'vegano', []);
+		expect(result.canCreate).toBe(false);
+		// The exact match must still appear in the matches list.
+		expect(result.matches.map((t) => t.name)).toContain('Vegano');
+	});
+
+	it('TP-05: excludes already-selected ids from the suggestions', () => {
+		const result = filterTagOptions(all, 'veg', ['Vegano']);
+		expect(result.matches.map((t) => t.name)).toEqual(['Vegetariano']);
+	});
+
+	it('TP-06: trims whitespace before evaluating the query', () => {
+		const result = filterTagOptions(all, '   ', []);
+		expect(result.matches).toHaveLength(4);
+		expect(result.canCreate).toBe(false);
+	});
+
+	it('TP-07: createName preserves the user input verbatim (no lowercasing)', () => {
+		const result = filterTagOptions(all, '  Sin-Gluten  ', []);
+		expect(result.createName).toBe('Sin-Gluten');
+		expect(result.canCreate).toBe(true);
+	});
+});
diff --git a/apps/web/src/lib/components/tag-picker-filter.ts b/apps/web/src/lib/components/tag-picker-filter.ts
new file mode 100644
index 0000000..b3a3964
--- /dev/null
+++ b/apps/web/src/lib/components/tag-picker-filter.ts
@@ -0,0 +1,45 @@
+/**
+ * Pure logic backing TagPicker.svelte — extracted so it can be unit-tested
+ * without rendering a component.
+ *
+ * Given the collective's full tag list, a search query, and the set of
+ * already-selected tag ids, returns:
+ *   - `matches`: tags matching the query (substring, case-insensitive)
+ *     with already-selected entries filtered out
+ *   - `canCreate`: whether the "Create `query`" affordance should appear
+ *     (true iff the trimmed query is non-empty AND no existing tag matches
+ *     the query exactly, case-insensitive)
+ *   - `createName`: the verbatim trimmed query — used as the new tag name
+ *     when the user picks the create affordance (no casing applied)
+ */
+import type { ItemTag } from '@colectivo/types';
+
+export interface TagFilterResult {
+	matches: ItemTag[];
+	canCreate: boolean;
+	createName: string;
+}
+
+export function filterTagOptions(
+	all: ItemTag[],
+	query: string,
+	selectedIds: string[]
+): TagFilterResult {
+	const trimmed = query.trim();
+	const lowerQuery = trimmed.toLowerCase();
+	const selectedSet = new Set(selectedIds);
+
+	const filtered = all.filter((t) => !selectedSet.has(t.id));
+
+	const matches = trimmed
+		? filtered.filter((t) => t.name.toLowerCase().includes(lowerQuery))
+		: filtered;
+
+	const exactMatchExists = all.some((t) => t.name.toLowerCase() === lowerQuery);
+
+	return {
+		matches,
+		canCreate: trimmed.length > 0 && !exactMatchExists,
+		createName: trimmed
+	};
+}
diff --git a/apps/web/tailwind.config.ts b/apps/web/tailwind.config.ts
index edcf1e1..f0222b4 100644
--- a/apps/web/tailwind.config.ts
+++ b/apps/web/tailwind.config.ts
@@ -1,7 +1,23 @@
 import type { Config } from 'tailwindcss';
 
+// Fase 11: tag colours are picked at runtime from an 8-preset palette
+// (see public.item_tags.color CHECK constraint). Tailwind cannot statically
+// see the class names (they're built from the colour string), so safelist
+// every (variant × intensity) combination the chip + dot use.
+const TAG_COLORS = ['slate', 'red', 'amber', 'green', 'sky', 'indigo', 'pink', 'stone'];
+const tagSafelist = TAG_COLORS.flatMap((c) => [
+	`bg-${c}-100`,
+	`text-${c}-700`,
+	`ring-${c}-200`,
+	`dark:bg-${c}-900/40`,
+	`dark:text-${c}-200`,
+	`dark:ring-${c}-700/50`,
+	`bg-${c}-500`
+]);
+
 export default {
 	content: ['./src/**/*.{html,js,svelte,ts}'],
+	safelist: tagSafelist,
 	// Fase 9.1: drive dark mode from <html data-theme="dark"> so the inline
 	// anti-FOUC script in app.html can set the attribute synchronously before
 	// the first paint. Existing `dark:` utilities keep working as-is.