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Dual Subtitles (Bilingual)

Combine two subtitle files in different languages into one bilingual file: two lines per subtitle, or one language on top and one at the bottom. Great for learning languages.

First language (main)

Second language

Only have one language? Translate it with AI in bilingual mode

How it works

  1. 1

    Drop your subtitle file into the box above.

  2. 2

    Adjust the options; the preview updates instantly.

  3. 3

    Download the result in the same or any other format.

Frequently asked questions

Is Dual Subtitles (Bilingual) free?

Yes. Every tool on FastSub AI is free, with no sign-up, no watermark and no usage limits.

Are my files uploaded anywhere?

No. Your files are read and processed inside your browser tab. The only downloads are the app itself and, for AI tools, the model files.

Is there a file size limit?

Subtitle files up to 20 MB and videos up to several GB, limited only by your device's memory.

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