Add subtitles to your video
AI transcribes your video in the browser, then burns styled subtitles right into the picture — an MP4 that shows captions everywhere. Nothing is uploaded.
Free · No signup · Files never leave your device
Drag and drop a video or audio file
or click to browse
How it works
Drop your video or audio
Any MP4, MOV, MKV, MP3, or recording — it stays on your device, nothing is uploaded.
AI transcribes locally
OpenAI's Whisper speech-recognition model runs right in your browser via WebGPU or WebAssembly, with a timestamp for every line. Or upload your own SRT/VTT to skip this step.
Style and burn them in
Pick the caption style — word-by-word, background box, size, position — preview it live, and download an MP4 with the captions baked in.
Subtitles baked into the video, privately
Burned-in subtitles are the safest way to caption a video: because they're part of the picture, every platform and player shows them identically, with no separate file to upload or track for a player to ignore. This tool transcribes the audio locally with Whisper, lets you style the captions with a live preview, then re-encodes the video in your browser — hardware accelerated on Chrome, Edge, and Safari.
Nothing is uploaded at any stage, so it works for footage you'd never send to a random web service. Prefer a soft, toggleable track or a plain SRT instead? Both are available from the same result screen without transcribing again.
Frequently asked questions
This page burns them into the pixels, so they display on every platform and player and can never be turned off — ideal for social video. If you'd rather have a toggleable track or a standalone SRT/VTT file, both options are one click away in the same tool.
Yes — choose how much text shows at a time (full sentences down to word-by-word), the text size, a background box for readability over busy footage, and bottom or center placement. A live preview on the video shows exactly what you'll get, and restyling never re-transcribes.
Yes. Upload an existing SRT or VTT file to skip transcription — then download it in another format, burn the captions into the video, or add them as a soft track.
No. The Whisper AI transcription runs locally in your browser via WebGPU or WebAssembly, and if you burn captions in, that re-encode runs on your device too. Your file never leaves your computer — once the page has loaded it even works offline.
Whisper was trained on about 100 languages, including English, Spanish, French, German, Chinese, Japanese, Arabic, and Hindi. Language is auto-detected by default; picking the spoken language can improve accuracy.
Yes. The subtitle tool is completely free, with no signup, watermarks, or limits. We make money from our video translation service, not from this tool.