diff --git a/web/src/lib/components/DownloadButton.svelte b/web/src/lib/components/DownloadButton.svelte
index c452846..62836f9 100644
--- a/web/src/lib/components/DownloadButton.svelte
+++ b/web/src/lib/components/DownloadButton.svelte
@@ -3,6 +3,7 @@
 	import { downloadBlob, encode } from '$lib/core/io';
 	import type { PixelImage } from '$lib/core/types';
 	import type { OutputFormat } from '$lib/registry';
+	import { t } from '$lib/i18n/t';
 
 	interface Props {
 		image: PixelImage | null;
@@ -38,8 +39,8 @@
 	fullWidth
 	disabled={!image || !format}
 	{busy}
-	busyText="Готовим файл…"
+	busyText={t('download.busy')}
 	onclick={download}
 >
-	Скачать .{format?.ext ?? 'png'}
+	{t('download.file', { ext: format?.ext ?? 'png' })}
 </Button>
diff --git a/web/src/lib/components/DropOverlay.svelte b/web/src/lib/components/DropOverlay.svelte
index c146ec5..339e162 100644
--- a/web/src/lib/components/DropOverlay.svelte
+++ b/web/src/lib/components/DropOverlay.svelte
@@ -1,6 +1,7 @@
 <script lang="ts">
 	import type { Snippet } from 'svelte';
 	import { isSupportedImage, unsupportedImageMessage } from '$lib/core/io';
+	import { t } from '$lib/i18n/t';
 
 	interface Props {
 		onFile: (file: File) => void;
@@ -12,7 +13,7 @@
 	let {
 		onFile,
 		onError,
-		label = 'Отпустите файл, чтобы заменить изображение',
+		label = t('dropZone.overlayDefault'),
 		children
 	}: Props = $props();
 
diff --git a/web/src/lib/components/DropZone.svelte b/web/src/lib/components/DropZone.svelte
index 6ba835d..2cfaabf 100644
--- a/web/src/lib/components/DropZone.svelte
+++ b/web/src/lib/components/DropZone.svelte
@@ -1,5 +1,6 @@
 <script lang="ts">
 	import { ACCEPTED_IMAGE_TYPES, isSupportedImage, unsupportedImageMessage } from '$lib/core/io';
+	import { t } from '$lib/i18n/t';
 
 	interface Props {
 		onFile: (file: File) => void;
@@ -7,8 +8,7 @@
 		label?: string;
 	}
 
-	let { onFile, onError, label = 'Перетащите изображение сюда или нажмите, чтобы выбрать файл' }: Props =
-		$props();
+	let { onFile, onError, label = t('dropZone.pickDefault') }: Props = $props();
 
 	let input = $state<HTMLInputElement | undefined>();
 	let depth = $state(0);
diff --git a/web/src/lib/components/InfoPanel.svelte b/web/src/lib/components/InfoPanel.svelte
index c101780..c0a1622 100644
--- a/web/src/lib/components/InfoPanel.svelte
+++ b/web/src/lib/components/InfoPanel.svelte
@@ -1,5 +1,8 @@
 <script lang="ts">
 	import type { ImageInfo } from '$lib/core/analyze';
+	import { LOCALE_TAGS } from '$lib/i18n/dict';
+	import { getLocale } from '$lib/i18n/locale.svelte';
+	import { t } from '$lib/i18n/t';
 
 	interface Props {
 		info: ImageInfo | null;
@@ -11,16 +14,16 @@
 {#if info}
 	<dl>
 		<div class="panel">
-			<dt>Размеры</dt>
+			<dt>{t('infoPanel.dimensions')}</dt>
 			<dd>{info.width} × {info.height} px</dd>
 		</div>
 		<div class="panel">
-			<dt>Альфа-канал</dt>
-			<dd>{info.hasAlpha ? 'есть — есть полупрозрачные пиксели' : 'нет'}</dd>
+			<dt>{t('infoPanel.alpha')}</dt>
+			<dd>{info.hasAlpha ? t('infoPanel.alphaYes') : t('infoPanel.alphaNo')}</dd>
 		</div>
 		<div class="panel">
-			<dt>Уникальных цветов (RGBA)</dt>
-			<dd>{info.colorCount.toLocaleString('ru-RU')}</dd>
+			<dt>{t('infoPanel.colorCount')}</dt>
+			<dd>{info.colorCount.toLocaleString(LOCALE_TAGS[getLocale()])}</dd>
 		</div>
 	</dl>
 {/if}
diff --git a/web/src/lib/components/ParamForm.svelte b/web/src/lib/components/ParamForm.svelte
index cdefd96..70f46ee 100644
--- a/web/src/lib/components/ParamForm.svelte
+++ b/web/src/lib/components/ParamForm.svelte
@@ -5,6 +5,7 @@
 	import SliderField from './ui/SliderField.svelte';
 	import TextField from './ui/TextField.svelte';
 	import type { ParamDef } from '$lib/registry';
+	import { t } from '$lib/i18n/t';
 
 	interface Props {
 		params: ParamDef[];
@@ -27,7 +28,7 @@
 
 <div class="params-grid">
 	{#if hasMask}
-		<CheckboxField id="show-mask" label="Показать маску" bind:checked={showMask} />
+		<CheckboxField id="show-mask" label={t('ui.showMask')} bind:checked={showMask} />
 	{/if}
 	{#each params as param (param.id)}
 		<div class="field">
diff --git a/web/src/lib/components/ToolPage.svelte b/web/src/lib/components/ToolPage.svelte
index 6ae70e2..ec835e1 100644
--- a/web/src/lib/components/ToolPage.svelte
+++ b/web/src/lib/components/ToolPage.svelte
@@ -11,6 +11,7 @@
 	import ChainToolBlock from './chain/ChainToolBlock.svelte';
 	import { createAutoRunner } from '$lib/tools/auto-run';
 	import { executeStep } from '$lib/tools/executor';
+	import { t } from '$lib/i18n/t';
 	import ParamsCard from './tool/ParamsCard.svelte';
 	import ResultCard from './tool/ResultCard.svelte';
 	import SourceCard from './tool/SourceCard.svelte';
@@ -175,8 +176,10 @@
 				try {
 					current = await executeStep(stepTool, current, sanitizeParams(stepTool, step.values));
 				} catch (e) {
-					const message = e instanceof Error ? e.message : String(e);
-					throw new Error(`Шаг ${i + 1} (${stepTool.title}): ${message}`);
+					const rawMsg = e instanceof Error ? e.message : String(e);
+					throw new Error(
+						t('toolPage.stepError', { n: i + 1, title: stepTool.title, msg: t(rawMsg) })
+					);
 				}
 				if (!runner.isCurrent(token)) return;
 				collected.push(current);
@@ -213,7 +216,8 @@
 
 	function showError(e: unknown) {
 		status = source ? 'loaded' : 'idle';
-		errorText = e instanceof Error ? e.message : String(e);
+		const raw = e instanceof Error ? e.message : String(e);
+		errorText = t(raw);
 	}
 
 	function reset() {
@@ -261,7 +265,7 @@
 	<div class="panel tool-block">
 		<div class="tool-stage" class:single={isSourceless}>
 			{#if !isSourceless}
-				<span class="edge-legend source-legend" aria-hidden="true">Исходник</span>
+				<span class="edge-legend source-legend" aria-hidden="true">{t('toolPage.legendSource')}</span>
 				<div class="cell">
 					{#if isTextSource && !source}
 						<TextInputCard onSubmit={handleTextSubmit} />
@@ -278,7 +282,7 @@
 				</div>
 			{/if}
 			<span class="edge-legend result-legend" aria-hidden="true">
-				{isInfo ? 'Сводка' : 'Результат'}
+				{isInfo ? t('toolPage.legendSummary') : t('toolPage.legendResult')}
 			</span>
 			<div class="cell">
 			<ResultCard
@@ -300,7 +304,7 @@
 
 	{#if (source || isSourceless) && !isInfo && (tool.params.length > 0 || hasMask)}
 		<div class="params-sep">
-			<span class="edge-legend" aria-hidden="true">Параметры</span>
+			<span class="edge-legend" aria-hidden="true">{t('toolPage.legendParams')}</span>
 		</div>
 		<ParamsCard
 			params={tool.params}
@@ -317,17 +321,17 @@
 		{#each chain as step, index (step.id)}
 			{#if step.toolId === ''}
 				<div class="panel empty-slot">
-					<header>
-						<h3 class="heading-section">Шаг {index + 1}</h3>
-						<button
-							type="button"
-							class="remove-step"
-							aria-label="Убрать шаг"
-							onclick={() => removeChainStep(index)}
-						>
-							✕
-						</button>
-					</header>
+				<header>
+					<h3 class="heading-section">{t('toolPage.stepHeading', { n: index + 1 })}</h3>
+					<button
+						type="button"
+						class="remove-step"
+						aria-label={t('toolPage.removeStepAria')}
+						onclick={() => removeChainStep(index)}
+					>
+						✕
+					</button>
+				</header>
 					<ToolSearch onSelect={(id) => applyChainTool(index, id)} />
 				</div>
 			{:else if getTool(step.toolId)}
diff --git a/web/src/lib/components/chain/ChainToolBlock.svelte b/web/src/lib/components/chain/ChainToolBlock.svelte
index 6cdf6ff..fae0711 100644
--- a/web/src/lib/components/chain/ChainToolBlock.svelte
+++ b/web/src/lib/components/chain/ChainToolBlock.svelte
@@ -1,6 +1,7 @@
 <script lang="ts">
 	import { outputOf, sanitizeParams, type ToolEntry } from '$lib/registry';
 	import type { PixelImage } from '$lib/core/types';
+	import { t } from '$lib/i18n/t';
 	import DownloadButton from '../DownloadButton.svelte';
 	import Button from '../ui/Button.svelte';
 	import EmptyState from '../ui/EmptyState.svelte';
@@ -47,12 +48,12 @@
 			{#if StepIcon}
 				<span class="step-icon" aria-hidden="true"><StepIcon size={14} strokeWidth={2} /></span>
 			{/if}
-			Шаг {index + 1}: {tool.title}
+			{t('chain.stepLabel', { n: index + 1, title: tool.title })}
 			<button
 				type="button"
 				class="remove"
-				aria-label="Убрать шаг"
-				title="Убрать шаг"
+				aria-label={t('chain.removeStepAria')}
+				title={t('chain.removeStepAria')}
 				onclick={onRemove}
 			>
 				✕
@@ -60,22 +61,22 @@
 		</span>
 
 		<div class="cell">
-			<span class="edge-legend cell-legend" aria-hidden="true">Вход</span>
+			<span class="edge-legend cell-legend" aria-hidden="true">{t('chain.inputLegend')}</span>
 			<div class="cell-media">
 				<Preview image={input} />
 			</div>
 		</div>
 		<div class="cell">
-			<span class="edge-legend cell-legend" aria-hidden="true">Результат</span>
+			<span class="edge-legend cell-legend" aria-hidden="true">{t('chain.resultLegend')}</span>
 			{#if busy && !result}
 				<div class="cell-media">
-					<EmptyState title="Обработка…" hint="Выполняется шаг цепочки" />
+					<EmptyState title={t('chain.busyTitle')} hint={t('chain.busyHint')} />
 				</div>
 			{:else}
 				<div class="cell-media">
 					<Preview image={result} />
 					{#if busy}
-						<span class="recalc" aria-live="polite">Пересчёт…</span>
+						<span class="recalc" aria-live="polite">{t('resultCard.recalc')}</span>
 					{/if}
 				</div>
 				<div class="actions-row">
@@ -87,7 +88,7 @@
 						{onError}
 					/>
 					<Button variant="secondary" fullWidth onclick={isLast ? onAddStep : onRemoveChain}>
-						{isLast ? '⛓ Следующий инструмент' : '✂ Оборвать цепочку'}
+						{isLast ? t('resultCard.nextTool') : t('resultCard.breakChain')}
 					</Button>
 				</div>
 			{/if}
@@ -96,7 +97,7 @@
 
 	{#if tool.params.length > 0}
 		<div class="params-sep">
-			<span class="edge-legend" aria-hidden="true">Параметры</span>
+			<span class="edge-legend" aria-hidden="true">{t('chain.paramsLegend')}</span>
 		</div>
 		<ParamsCard params={tool.params} bind:values />
 	{/if}
diff --git a/web/src/lib/components/search/ToolSearch.svelte b/web/src/lib/components/search/ToolSearch.svelte
index 372dee6..7dfede2 100644
--- a/web/src/lib/components/search/ToolSearch.svelte
+++ b/web/src/lib/components/search/ToolSearch.svelte
@@ -1,5 +1,6 @@
 <script lang="ts">
 	import { isChainable, TOOLS } from '$lib/registry';
+	import { t } from '$lib/i18n/t';
 	import ToolCard from './ToolCard.svelte';
 
 	interface Props {
@@ -106,14 +107,14 @@
 			activeIndex = 0;
 		}}
 		onkeydown={onKeydown}
-		placeholder="Найдите инструмент…"
-		aria-label="Поиск инструмента"
+		placeholder={t('search.placeholder')}
+		aria-label={t('search.aria')}
 		role="combobox"
 		aria-expanded={listOpen}
 		aria-controls="tool-search-list"
 	/>
 	{#if listOpen && query.trim().length > 0 && matches.length === 0}
-		<p class="none text-muted">Ничего не найдено — попробуйте другое слово.</p>
+		<p class="none text-muted">{t('search.nothingFound')}</p>
 	{:else if listOpen && matches.length > 0}
 		<div id="tool-search-list" class="cards" role="listbox">
 			{#each matches as match, index (match.id)}
diff --git a/web/src/lib/components/tool/ParamsCard.svelte b/web/src/lib/components/tool/ParamsCard.svelte
index 43f5b24..ff867d0 100644
--- a/web/src/lib/components/tool/ParamsCard.svelte
+++ b/web/src/lib/components/tool/ParamsCard.svelte
@@ -1,6 +1,7 @@
 <script lang="ts">
 	import ParamForm from '../ParamForm.svelte';
 	import type { ParamDef } from '$lib/registry';
+	import { t } from '$lib/i18n/t';
 
 	interface Props {
 		params: ParamDef[];
@@ -32,9 +33,7 @@
 			bind:showMask
 		/>
 	{:else}
-		<p class="hint text-caption text-muted">
-			У этого инструмента нет параметров — результат уже готов.
-		</p>
+		<p class="hint text-caption text-muted">{t('paramsCard.noParams')}</p>
 	{/if}
 </div>
 
diff --git a/web/src/lib/components/tool/ResultCard.svelte b/web/src/lib/components/tool/ResultCard.svelte
index 4803036..3f90b79 100644
--- a/web/src/lib/components/tool/ResultCard.svelte
+++ b/web/src/lib/components/tool/ResultCard.svelte
@@ -8,6 +8,7 @@
 	import type { ImageInfo } from '$lib/core/analyze';
 	import type { PixelImage } from '$lib/core/types';
 	import { outputOf, type ToolEntry } from '$lib/registry';
+	import { t } from '$lib/i18n/t';
 
 	type Status = 'idle' | 'loaded' | 'processing' | 'error';
 
@@ -45,16 +46,13 @@
 <div class="container">
 	{#if !sourceLoaded}
 		<div class="media">
-			<EmptyState
-				title="Результат появится здесь"
-				hint="Сначала загрузите исходное изображение слева"
-			/>
+			<EmptyState title={t('resultCard.emptyTitle')} hint={t('resultCard.emptyHint')} />
 		</div>
 	{:else if !isInfo && status === 'processing' && !result}
 		<div class="media">
 			<EmptyState
-				title="Обработка…"
-				hint="Изображение обрабатывается, это займёт немного времени"
+				title={t('resultCard.processingTitle')}
+				hint={t('resultCard.processingHint')}
 			/>
 		</div>
 	{:else if isInfo}
@@ -73,7 +71,7 @@
 		<div class="media">
 			<Preview image={displayImage} />
 			{#if status === 'processing'}
-				<span class="recalc" aria-live="polite">Пересчёт…</span>
+				<span class="recalc" aria-live="polite">{t('resultCard.recalc')}</span>
 			{/if}
 		</div>
 		<div class="actions-row">
@@ -86,7 +84,7 @@
 			/>
 			{#if onChainToggle}
 				<Button variant="secondary" fullWidth onclick={onChainToggle}>
-					{hasChain ? '✂ Оборвать цепочку' : '⛓ Следующий инструмент'}
+					{hasChain ? t('resultCard.breakChain') : t('resultCard.nextTool')}
 				</Button>
 			{/if}
 		</div>
diff --git a/web/src/lib/components/tool/SourceCard.svelte b/web/src/lib/components/tool/SourceCard.svelte
index 7f41d1c..96f17cb 100644
--- a/web/src/lib/components/tool/SourceCard.svelte
+++ b/web/src/lib/components/tool/SourceCard.svelte
@@ -1,5 +1,6 @@
 <script lang="ts">
 	import type { PixelImage } from '$lib/core/types';
+	import { t } from '$lib/i18n/t';
 	import DropOverlay from '../DropOverlay.svelte';
 	import DropZone from '../DropZone.svelte';
 	import Preview from '../Preview.svelte';
@@ -25,7 +26,7 @@
 			<div class="media">
 				<Preview image={source} pipetteActive={pipetteActive} onPickColor={onPickColor} />
 			</div>
-			<Button variant="secondary" onclick={onReset}>Заменить изображение</Button>
+			<Button variant="secondary" onclick={onReset}>{t('sourceCard.replaceImage')}</Button>
 		</DropOverlay>
 	{/if}
 </div>
diff --git a/web/src/lib/components/tool/TextInputCard.svelte b/web/src/lib/components/tool/TextInputCard.svelte
index 8725d22..d9f4828 100644
--- a/web/src/lib/components/tool/TextInputCard.svelte
+++ b/web/src/lib/components/tool/TextInputCard.svelte
@@ -1,5 +1,6 @@
 <script lang="ts">
 	import Button from '../ui/Button.svelte';
+	import { t } from '$lib/i18n/t';
 
 	interface Props {
 		onSubmit: (text: string) => void;
@@ -16,16 +17,16 @@
 </script>
 
 <div class="container">
-	<h2 class="heading-section">Текст</h2>
+	<h2 class="heading-section">{t('textInput.heading')}</h2>
 	<textarea
 		class="input"
 		rows="8"
 		bind:value={text}
-		placeholder="Вставьте данные сюда"
-		aria-label="Текстовые данные"
+		placeholder={t('textInput.placeholder')}
+		aria-label={t('textInput.aria')}
 	></textarea>
 	<Button variant="secondary" onclick={submit} disabled={text.trim().length === 0}>
-		Декодировать
+		{t('textInput.decode')}
 	</Button>
 </div>
 
diff --git a/web/src/lib/components/tool/TextResult.svelte b/web/src/lib/components/tool/TextResult.svelte
index 43693f5..ed96786 100644
--- a/web/src/lib/components/tool/TextResult.svelte
+++ b/web/src/lib/components/tool/TextResult.svelte
@@ -1,5 +1,6 @@
 <script lang="ts">
 	import { downloadBlob } from '$lib/core/io';
+	import { t } from '$lib/i18n/t';
 
 	interface Props {
 		text: string;
@@ -22,12 +23,12 @@
 </script>
 
 <div class="panel text-result">
-	<textarea class="output" rows="10" readonly value={text} aria-label="Текстовый результат"></textarea>
+	<textarea class="output" rows="10" readonly value={text} aria-label={t('textResult.outputAria')}></textarea>
 	<div class="actions">
 		<button type="button" class="secondary" onclick={copy}>
-			{copied ? 'Скопировано' : 'Копировать'}
+			{copied ? t('textResult.copied') : t('textResult.copy')}
 		</button>
-		<button type="button" class="primary" onclick={download}>Скачать .txt</button>
+		<button type="button" class="primary" onclick={download}>{t('textResult.downloadTxt')}</button>
 	</div>
 </div>
 
diff --git a/web/src/lib/components/ui/ColorField.svelte b/web/src/lib/components/ui/ColorField.svelte
index 45eaf7f..39057d4 100644
--- a/web/src/lib/components/ui/ColorField.svelte
+++ b/web/src/lib/components/ui/ColorField.svelte
@@ -1,5 +1,6 @@
 <script lang="ts">
 	import Field from './Field.svelte';
+	import { t } from '$lib/i18n/t';
 
 	interface Props {
 		id: string;
@@ -21,9 +22,9 @@
 			<button
 				type="button"
 				class="pipette"
-				aria-label="Пипетка"
+				aria-label={t('ui.pipette')}
 				aria-pressed={pipetteActive}
-				title="Пипетка"
+				title={t('ui.pipette')}
 				onclick={onPipetteToggle}
 			>
 				◎
diff --git a/web/src/lib/components/ui/SliderField.svelte b/web/src/lib/components/ui/SliderField.svelte
index d9ff20b..d4a123d 100644
--- a/web/src/lib/components/ui/SliderField.svelte
+++ b/web/src/lib/components/ui/SliderField.svelte
@@ -1,5 +1,6 @@
 <script lang="ts">
 	import Field from './Field.svelte';
+	import { t } from '$lib/i18n/t';
 
 	interface Props {
 		id: string;
@@ -42,13 +43,13 @@
 
 <Field {id} {label} {hint}>
 	<div class="row">
-		<button type="button" class="step" aria-label="Уменьшить" onclick={decrement}>−</button>
+		<button type="button" class="step" aria-label={t('ui.decrease')} onclick={decrement}>−</button>
 		<input id={id} type="range" min={min} max={max} step={step} bind:value />
-		<button type="button" class="step" aria-label="Увеличить" onclick={increment}>+</button>
+		<button type="button" class="step" aria-label={t('ui.increase')} onclick={increment}>+</button>
 		<button
 			type="button"
 			class="step"
-			aria-label="Сбросить"
+			aria-label={t('ui.reset')}
 			disabled={resetDisabled}
 			onclick={reset}
 		>
diff --git a/web/src/lib/tools/executor.test.ts b/web/src/lib/tools/executor.test.ts
index 9bed603..48fa7bb 100644
--- a/web/src/lib/tools/executor.test.ts
+++ b/web/src/lib/tools/executor.test.ts
@@ -31,7 +31,7 @@ describe('executeStep: прямой путь (среда без Worker)', () =>
 
 	it('инструмент без run даёт понятную ошибку', async () => {
 		await expect(executeStep({ id: 'stub' }, makeImage(1, 1, [[0, 0, 0, 255]]), {})).rejects.toThrow(
-			'не обрабатывает изображения'
+			'errors.noImageRun'
 		);
 	});
 });
diff --git a/web/src/lib/tools/executor.ts b/web/src/lib/tools/executor.ts
index 0dbfc19..b5e3a0c 100644
--- a/web/src/lib/tools/executor.ts
+++ b/web/src/lib/tools/executor.ts
@@ -11,7 +11,7 @@ export async function executeStep(
 	params: Record<string, unknown>
 ): Promise<PixelImage> {
 	if (!tool.run) {
-		throw new Error('Этот инструмент не обрабатывает изображения');
+		throw new Error('errors.noImageRun');
 	}
 	if (typeof Worker === 'undefined') {
 		return await runDirect(tool, img, params);
@@ -35,7 +35,7 @@ async function runDirect(
 	params: Record<string, unknown>
 ): Promise<PixelImage> {
 	if (!tool.run) {
-		throw new Error('Этот инструмент не обрабатывает изображения');
+		throw new Error('errors.noImageRun');
 	}
 	return await tool.run(img, params);
 }
@@ -74,13 +74,13 @@ function ensureWorker(): Worker | null {
 					data: new Uint8ClampedArray(payload.data)
 				});
 			} else {
-				entry.reject(new Error(payload.error ?? 'Ошибка исполнения в воркере'));
+				entry.reject(new Error(payload.error ?? 'errors.workerFailed'));
 			}
 		};
 		candidate.onerror = () => {
 			worker = null;
 			for (const entry of pending.values()) {
-				entry.reject(new Error('Воркер недоступен'));
+				entry.reject(new Error('errors.workerUnavailable'));
 			}
 			pending.clear();
 		};
diff --git a/web/src/lib/tools/executor.worker.ts b/web/src/lib/tools/executor.worker.ts
index d7eec7e..5c7b2f8 100644
--- a/web/src/lib/tools/executor.worker.ts
+++ b/web/src/lib/tools/executor.worker.ts
@@ -17,7 +17,7 @@ async function handle(request: WorkerRequest): Promise<void> {
 	try {
 		const tool = getTool(request.toolId);
 		if (!tool?.run) {
-			throw new Error('Этот инструмент не обрабатывает изображения');
+			throw new Error('errors.noImageRun');
 		}
 		const image: PixelImage = {
 			width: request.image.width,
diff --git a/web/src/routes/+page.svelte b/web/src/routes/+page.svelte
index 47a114f..a537a86 100644
--- a/web/src/routes/+page.svelte
+++ b/web/src/routes/+page.svelte
@@ -1,5 +1,6 @@
 <script lang="ts">
 	import { getTool } from '$lib/registry';
+	import { t } from '$lib/i18n/t';
 	import ToolPage from '$lib/components/ToolPage.svelte';
 	import ToolSearch from '$lib/components/search/ToolSearch.svelte';
 	import Button from '$lib/components/ui/Button.svelte';
@@ -42,20 +43,20 @@
 
 <svelte:head>
 	<title>
-		{selected ? `${selected.title} — easy-png-tools` : 'easy-png-tools — PNG-утилиты прямо в браузере'}
+		{selected ? `${selected.title} — easy-png-tools` : t('home.defaultTitle')}
 	</title>
 </svelte:head>
 
 {#if !selected}
 	<section class="hero">
-		<h1>Что делаем с изображением?</h1>
-		<p class="lead text-muted">Найдите инструмент — все операции выполняются локально в браузере.</p>
+		<h1>{t('home.heroTitle')}</h1>
+		<p class="lead text-muted">{t('home.heroLead')}</p>
 		<ToolSearch onSelect={(id) => openTool(id)} />
 		{#if lastToolId !== null && getTool(lastToolId)}
 			{@const restoreId = lastToolId}
 			<div class="restore-row">
 				<Button variant="secondary" fullWidth onclick={() => openTool(restoreId, true)}>
-					↩ Вернуть последний: {getTool(restoreId)?.title}
+					{t('home.restoreLast', { title: getTool(restoreId)?.title ?? '' })}
 				</Button>
 			</div>
 		{/if}
@@ -63,7 +64,7 @@
 {:else}
 	<section class="workbench">
 		<button type="button" class="back text-caption text-muted" onclick={closeTool}>
-			← Сменить инструмент
+			{t('home.changeTool')}
 		</button>
 		{#key selectedId}
 			<ToolPage tool={selected} restoreChain={restoreOnOpen} />
diff --git a/web/src/routes/list-tools/+page.svelte b/web/src/routes/list-tools/+page.svelte
index fa4eb9e..3555cdb 100644
--- a/web/src/routes/list-tools/+page.svelte
+++ b/web/src/routes/list-tools/+page.svelte
@@ -1,27 +1,23 @@
 <script lang="ts">
 	import { CATEGORIES } from '$lib/categories';
+	import { t } from '$lib/i18n/t';
 	import ToolCard from '$lib/components/search/ToolCard.svelte';
 	import { TOOLS } from '$lib/registry';
 </script>
 
 <svelte:head>
-	<title>Все инструменты — easy-png-tools</title>
-	<meta
-		name="description"
-		content="Полный каталог PNG-утилит: конвертация, прозрачность, цвет, геометрия, анализ и генерация изображений."
-	/>
+	<title>{t('catalog.pageTitle')}</title>
+	<meta name="description" content={t('catalog.metaDescription')} />
 </svelte:head>
 
-<h1>Каталог инструментов</h1>
-<p class="lead text-muted">
-	{TOOLS.length} утилит для работы с PNG. Все операции выполняются локально в браузере.
-</p>
+<h1>{t('catalog.heading')}</h1>
+<p class="lead text-muted">{t('catalog.lead', { count: TOOLS.length })}</p>
 
 {#each CATEGORIES as category (category.id)}
 	{@const categoryTools = TOOLS.filter((tool) => tool.category === category.id)}
 	{#if categoryTools.length > 0}
 		<section id={category.id} class="category" aria-labelledby="{category.id}-heading">
-			<h2 id="{category.id}-heading" class="heading-section">{category.label}</h2>
+			<h2 id="{category.id}-heading" class="heading-section">{t(`categories.${category.id}`)}</h2>
 			<div class="grid">
 				{#each categoryTools as tool (tool.id)}
 					<div class="panel">
diff --git a/web/src/routes/tools/[id]/+page.svelte b/web/src/routes/tools/[id]/+page.svelte
index 0e98a5b..82abbd6 100644
--- a/web/src/routes/tools/[id]/+page.svelte
+++ b/web/src/routes/tools/[id]/+page.svelte
@@ -1,6 +1,7 @@
 <script lang="ts">
 	import ToolPage from '$lib/components/ToolPage.svelte';
 	import { getTool } from '$lib/registry';
+	import { t } from '$lib/i18n/t';
 
 	let { data } = $props();
 
@@ -8,7 +9,7 @@
 </script>
 
 <svelte:head>
-	<title>{tool?.title ?? 'Инструмент'} — easy-png-tools</title>
+	<title>{tool?.title ?? t('toolPage.fallbackTitle')} — easy-png-tools</title>
 	{#if tool}
 		<meta name="description" content={tool.description} />
 	{/if}
diff --git a/web/src/routes/tools/[id]/+page.ts b/web/src/routes/tools/[id]/+page.ts
index a2a0ac9..3c8ce97 100644
--- a/web/src/routes/tools/[id]/+page.ts
+++ b/web/src/routes/tools/[id]/+page.ts
@@ -1,5 +1,6 @@
 import { error } from '@sveltejs/kit';
 import { getTool, TOOLS } from '$lib/registry';
+import { t } from '$lib/i18n/t';
 import type { EntryGenerator, PageLoad } from './$types';
 
 export const entries: EntryGenerator = () => TOOLS.map((tool) => ({ id: tool.id }));
@@ -7,7 +8,7 @@ export const entries: EntryGenerator = () => TOOLS.map((tool) => ({ id: tool.id
 export const load: PageLoad = ({ params }) => {
 	const tool = getTool(params.id);
 	if (!tool) {
-		error(404, 'Инструмент не найден');
+		error(404, t('errors.notFound'));
 	}
 	return { id: tool.id };
 };