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CAPTIONER · PRIVATE AI SUBTITLE TOOL

Auto captions

Free AI captions in 90+ languages. No app to install, no account needed, and your video never leaves your device.

Runs on your device. Nothing is uploaded.
No installFree, no sign-upNothing uploaded90+ languages

Captions in three steps

  1. Drop your video. Any MP4, MOV or WebM, or an audio file. It stays on your device.
  2. Generate captions. Speech is turned into timed captions, word by word, in 90+ languages. Fix any word by clicking it.
  3. Download. Get an SRT or VTT file for YouTube and editors, or a video with bold captions burned in for Reels, TikTok and Shorts.

Captioner questions

Is it free?

Yes. Videos up to 1 minute are free with no sign-up. Sign in for free to caption videos up to 30 minutes.

Do I need to install anything?

No. Captioner runs in your web browser on computer or phone. The speech model downloads once the first time, then it’s saved.

Are my videos uploaded?

No. The speech recognition runs inside your browser on your own device. Your video and audio never leave it.

Which languages work?

More than 90, including English, Spanish, French, German, Arabic, Persian, Hindi, Chinese and Japanese. Choose “English (translate)” to get English captions for speech in another language.

Why does the first use take longer?

The first time, your browser downloads the speech model once (about 80 MB for Fast, more for Best). After that it’s saved on your device and starts in seconds.

What can I download?

SRT and VTT subtitle files for YouTube and video editors, a plain-text transcript, or an MP4 with the captions burned in.

How long can my video be?

Without signing in, Captioner processes the first minute. Signed-in users can process up to 30 minutes per video. Longer recordings should be split into smaller files.

Your files stay on your device

Captioner turns speech into text with an AI model that runs in your browser. To start, your browser downloads the free model and software from Hugging Face and jsDelivr, but your recordings are never sent to ANTB or anyone else.

Terms of use and copyright
  • Free use is limited to 1 minute per video; signed-in users can process longer videos.
  • Only use recordings you created, own, or have permission to use.
  • Adding captions doesn’t change who owns the copyright in the original.
  • You’re responsible for the files you process and how you share the results.
Disclaimer
  • Automatic captions are produced by AI and can mishear words, names, numbers and accents. Always check and correct them before you publish, especially for legal, medical or accessibility-critical use.
  • Captioner is provided free and “as is”, without any warranty. ANTB isn’t responsible for any loss or damage from using it or from the files it makes.
  • You’re responsible for having the rights to the recordings you use and permission from the people in them.
  • Don’t use Captioner to mislead people, put words in anyone’s mouth, or create unlawful content.
  • Captioner uses open-source software: OpenAI Whisper models (MIT), Transformers.js (Apache 2.0) and Mediabunny (MPL 2.0).