A translation API that actually preserves your formatting.
One endpoint. Any format. 43 languages. Clean JSON in, translated JSON out — with every Markdown heading, JSON key, and HTML attribute exactly where you left it.
Integrate your CMS publish hook, i18n pipeline, or deployment workflow in minutes.
Get your first translation in under 5 minutes.
curl -X POST https://api.usepolylingo.com/v1/translate \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"content": "# Hello World\n\nThis is **bold** text.",
"format": "markdown",
"targets": ["es", "fr", "de", "zh", "ar"],
"model": "standard"
}'Every format, handled correctly
PolyLingo detects the format automatically or you can specify it explicitly. Structure is never touched — only the text inside it.
Markdown
Headings, bold, italic, links, code fences, lists — all preserved exactly. Only the text nodes are translated.
# Hello → # HolaJSON
Keys stay untouched. Only string values are translated. Nested objects and arrays are handled recursively.
"greeting": "Hello" → "greeting": "Hola"HTML
Tags, attributes, class names, href values — never modified. Only visible text nodes are translated.
<h1>Hello</h1> → <h1>Hola</h1>Plain text
Clean translation with no markup concerns. Auto-detected when no format markers are present.
"Hello World" → "Hola Mundo"Rate limits by plan
| Plan | Requests / min | Tokens / month |
|---|---|---|
| Free | 10 req / min | 100,000 / month |
| Starter | 60 req / min | 600,000 / month |
| GrowthPopular | 200 req / min | 2,500,000 / month |
| Scale | 600 req / min | 8,000,000 / month |
All tiers use sliding-window rate limiting keyed to your API key. See full pricing →
43 languages and dialects
Full coverage including regional variants — French (Canada), Portuguese (Brazil), Spanish (Mexico), English (UK) — and RTL languages with correct text direction handling in structured formats.
arArabicbnBengalibgBulgarianhrCroatiancsCzechdaDanishnlDutchenEnglishen-GBEnglish (UK)fiFinnishfrFrenchfr-CAFrench (Canada)deGermanelGreekheHebrewhiHindihuHungarianidIndonesianitItalianjaJapanesekoKoreanmsMalaynoNorwegianfaPersian (Farsi)plPolishptPortuguesept-BRPortuguese (Brazil)pt-PTPortuguese (Portugal)roRomanianruRussianskSlovakesSpanishes-ESSpanish (Spain)es-MXSpanish (Mexico)swSwahilisvSwedishthThaitrTurkishukUkrainianviVietnamesezhChinese (Simplified)zh-TWChinese (Traditional)zh-HKChinese (Hong Kong)
Translate in CI
Automate locale JSON and Markdown from pushes or schedules. Pin UsePolyLingo/translate-action@v1 from the Marketplace.
Official SDKs
Use the typed Node.js or Python clients — same REST surface as the API reference, with helpers for async translation jobs.