Are my files uploaded to a server?

No. The translation model is downloaded to your browser and runs on your own device — your files never leave it.

Which formats can I translate?

Subtitle files (.srt and .vtt) and plain text (.txt), plus text you paste directly.

Which languages are supported?

40+ languages are in the picker (English, Spanish, French, German, Chinese, Japanese, Arabic, Hindi and more). Mozilla's Firefox Translations models do the translating; a pair without English goes through English.

Yes — free and unlimited. There's no account and no metering because the model runs on your device, not our servers.

Why is the first translation slower?

The first run downloads the model for your language pair — 14 to 38 MB per direction, plus a 5 MB translation engine — then it's cached in your browser, so later translations start almost at once.

Where does the translation happen?

Entirely in your browser. Mozilla's Firefox Translations models are downloaded once from our own server, cached on your device and run locally — so subtitles and documents you translate are never sent anywhere.

Subtitle translator

Translate .srt and .vtt subtitle files between 40+ languages, with every cue timing kept exactly as it was. Plain text works too. Your files are never uploaded — the model runs entirely on your device, so it's free, unlimited, and private.

Your text
Upload filePaste text
Drop a .srt, .vtt or .txt file here — or click to choose
SRTVTTTXT
Your files are never uploaded — everything runs on your device.
Languages
Translation

How to translate a subtitle file

Add your file or text

Drop a .srt, .vtt or .txt file, or paste text straight in. It never leaves your browser.
Pick the languages

Choose the language you're translating from and to — 40+ languages. A pair without English, such as Swedish to German, is translated through English.
Translate & download

The model runs on your device (the first run downloads it for your language pair, then it's cached). Subtitle timings are preserved; download the translated file or copy the text.

Why translate here

Your files are never uploaded

Translation runs 100% in your browser — no server, no account, no upload. The perfect fit for confidential documents and unreleased subtitles.

Perfect subtitle timings

SRT and VTT cues keep their exact timestamps and order — only the spoken text is translated, so your subtitles still sync frame-for-frame.

Free & unlimited

Because inference happens on your device, there's no per-word cost and no cap. Translate as much as you like.

The model behind it

Powered by Firefox Translations, Mozilla's own translation models (Bergamot), released under the MPL-2.0 licence. Each language direction is a small download, 14–38 MB, and runs on your processor — no graphics card needed.

Questions

Are my files uploaded to a server?: No. The translation model is downloaded to your browser and runs on your own device — your files never leave it.
Which formats can I translate?: Subtitle files (.srt and .vtt) and plain text (.txt), plus text you paste directly.
Which languages are supported?: 40+ languages are in the picker (English, Spanish, French, German, Chinese, Japanese, Arabic, Hindi and more). Mozilla's Firefox Translations models do the translating; a pair without English goes through English.
Is it really free?: Yes — free and unlimited. There's no account and no metering because the model runs on your device, not our servers.
Why is the first translation slower?: The first run downloads the model for your language pair — 14 to 38 MB per direction, plus a 5 MB translation engine — then it's cached in your browser, so later translations start almost at once.
Where does the translation happen?: Entirely in your browser. Mozilla's Firefox Translations models are downloaded once from our own server, cached on your device and run locally — so subtitles and documents you translate are never sent anywhere.

Your text

Languages

Translation