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ISO 639 Language Lookup

Searches a curated list of ~150 widely-spoken languages — the top ~100 by speakers plus all six UN official languages and major regional languages. Returns the ISO 639-1 alpha-2 code, ISO 639-2/T (terminological) alpha-3 code, the ISO 639-2/B (bibliographic) variant when it differs, the English name, the native (endonym) name, the language family and writing direction (LTR / RTL / TTB). Useful for product engineers building locale pickers, content teams tagging translations, and i18n developers validating BCP-47 tags. Match strategy: 2 chars → alpha-2 exact; 3 chars → alpha-3 exact (terminological or bibliographic); longer → case-insensitive substring on name or nativeName. Runs entirely in your browser — your data is never sent anywhere.

Privacy

Runs entirely in your browser — nothing is sent to any server.

Cost

Free. No sign-up, no watermark.

Type

Lookup

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Frequently asked

Is ISO 639 Language Lookup free to use?

Yes. ISO 639 Language Lookup is completely free with no sign-up, no watermark, and no usage limits. Toolsly does not charge for any of its tools.

Do my files and data stay private?

Yes — ISO 639 Language Lookup runs entirely in your browser using your device's CPU. Files and text are never uploaded to our servers, so your data stays private.

How does ISO 639 Language Lookup work?

Open ISO 639 Language Lookup, paste or fill in the input fields, and the result updates instantly. Everything runs in your browser — no upload, no waiting.

Which browsers does ISO 639 Language Lookup support?

Any modern browser works — Chrome, Firefox, Safari, and Edge on desktop and mobile. ISO 639 Language Lookup uses standard web APIs and does not require any plugin, extension, or sign-up.