Add Subtitles
Burn subtitles into video
100% private — everything stays in your browser
Loading FFmpeg (~30 MB)...
This may take a moment on first visit
How to use Add Subtitles
- 1 Select your video file — Drag and drop your video file into the upload area, or click to browse. The file stays on your device.
- 2 Configure and process — Adjust any settings, then click to process. The video is converted using WebAssembly directly in your browser — nothing is uploaded.
- 3 Download the result — Download your converted video file. It was processed entirely on your device.
Frequently asked questions
- Is there a file size limit?
- There's no server-imposed limit since everything runs on your device. The practical limit depends on your browser's available memory — most files up to a few hundred MB work fine.
- Why does processing take a while?
- Video and audio processing uses FFmpeg compiled to WebAssembly, which runs in your browser. It's slower than a native app but means your files never leave your device. Larger files and higher resolutions take longer.