How to Translate Subtitle Files

Short answer: upload your existing SRT or VTT file, choose a target language, and download a translated subtitle file. The sequence numbers and timestamps stay available, so you are translating dialogue rather than rebuilding a timeline.

Why you start from the subtitle file

The expensive part of subtitling is not the words — it is the timing. Someone already decided where each caption starts, where it ends and where the line breaks fall. Translating the existing file keeps all of that work and changes only the text inside it. Starting over from the video throws away the timing and doubles the job.

Step by step

1. Upload your file. Open the subtitle translator and select an SRT or VTT file from your device.
2. Select a target language. Choose the language you want the dialogue translated into.
3. Start the translation. The AI translates the dialogue while preserving the subtitle structure.
4. Review, then download. Check the translated content before you save it — this step matters more than it sounds, for the reason below.

Always review the length

Sentence length varies a lot between languages. A caption that fits comfortably in English can run 30% longer in German or Spanish and no longer fit the time it was allotted, which quietly breaks reading speed for the viewer. When you review the finished file, check three things:

• Reading speed — can a viewer finish the line before it disappears?
• Line length — does a caption now wrap to three lines and cover the picture?
• Terminology — are product names, technical terms and proper nouns handled the way you want? Machine translation is not reliable about names.

A realistic example

You have a 12-minute product walkthrough captioned in English and want Spanish subtitles for a launch. Translating the existing SRT gives you a Spanish file with identical timings in a few minutes. You then spend twenty minutes reviewing it — mostly shortening a handful of captions that grew too long and fixing your own product names — rather than several hours timing captions from scratch.

Which languages are worth doing first

If you are subtitling for reach rather than for a specific contract, the order matters more than the count. A practical sequence:

1. Start with one language and finish it properly, review included. Ten half-checked languages are worth less than one that reads well.
2. Follow your existing audience. Your analytics already tell you where viewers come from; that beats guessing at market size.
3. Watch for expansion-heavy targets. German, Spanish, French and Portuguese typically run longer than English, so they need more review time per minute of video than, say, Turkish or Japanese.

Format problems before or after

If the translated file needs to be a different format from the one you started with, convert it: SRT to VTT for web players, or VTT to SRT for editors and platforms that want SubRip. Both conversions run in your browser.

Related tools

If you have no subtitle file yet, start with the video subtitle generator to produce one from the audio, then translate it. Everything is listed under Subtitle and Translation Tools.

Frequently asked questions

Which subtitle formats are supported?

SRT (SubRip) and VTT (WebVTT).

Will my timings be preserved?

Sequence numbers and timestamps remain available while the subtitle text is translated, so you do not have to recreate the timeline.

Is the translation good enough to publish without checking?

Review it first. AI translation handles ordinary dialogue well but is not reliable with proper nouns, product names and technical terminology, and translated lines can become too long for the time they are given.

Can I translate a subtitle file for a video I do not own?

Only with permission. Subtitles are a derivative of the original work, and translating and publishing them without the rights holder's consent can infringe copyright.

What if my file is in the wrong format?

Convert it before or after translating — SRT and VTT convert to each other in your browser.

Before you upload

A subtitle file contains everything that was said in the video, so treat it as sensitive material. Only upload subtitles you own or have permission to process.