PrivateYour video never leaves your browser
Free Caption Generator
Add accurate, styled captions to any video in about a minute. Download SRT for free or export a captioned MP4, right in your browser.
Drop a video or audio file
MP4, MOV, WEBM, MP3, WAV · up to 10 min on Free · no signup
01
Upload
Drop a video or audio file. It never leaves your device.
02
Edit & style
Fix any word, pick a caption style, adjust size and position.
03
Export
Download SRT/VTT free, or an MP4 with captions burned in.
Captions in three steps
Drop in a video, let AI transcribe every word with precise timing, then pick a style and export. No software to install and no account needed to get started.
Styles made for social video
Bold word-by-word captions for TikTok and Reels, karaoke highlights, boxed subtitles for YouTube and clean minimal captions for interviews. Change fonts, colours, size and position in a click.
Private by design
Your video never leaves your device. We extract a small audio track in your browser for transcription and render the final video locally, so even large files are fast.
FAQ
Frequently asked questions
Is it really free?+
Yes. You can transcribe up to 30 minutes a day, edit your captions and download SRT, VTT or TXT files for free with no watermark. Exporting a video with burned-in captions is free at 720p with a small watermark; paid plans unlock 1080p, 4K and no watermark.
Is my video uploaded to your servers?+
No. Your video is processed entirely in your browser. Only a compressed audio track is sent for transcription, and it isn't stored afterwards.
How accurate are the captions?+
Very accurate for clear speech, using the latest Whisper-class speech recognition. Every word is editable, so you can fix names, jargon or slang before you export.
Which file types can I upload?+
MP4, MOV, WEBM and MKV videos, plus audio files like MP3, WAV and M4A. Free accounts can upload videos up to 10 minutes long.
Do I need an account?+
No. Upload, transcribe, edit and download subtitle files without signing up. We only ask for an email when you export a captioned video on the free plan.