Subtitle Burn-In Tool
Hard-embed captions into the video itself. Drop a video and a subtitle file, sync the timing, pick the style, and burn — all locally in your browser. Outputs MP4 (H.264 / AAC).
- In your browser
- Files never uploaded
- Free
Frequently asked questions
Does the Burn-In tool upload my video?
No. The video, subtitle files, and finished MP4 are processed in your browser and stay on your device.
Which video and subtitle formats can I use?
Use a video format FFmpeg can read, such as MP4, MKV, MOV, or WebM. Subtitle files can be SRT, VTT, ASS, SMI, TTML, SBV, or LRC.
What file does the tool create?
It creates an MP4 with H.264 video and AAC audio, with the selected subtitles rendered directly into the picture.
Can I change how the subtitles look?
Yes. Choose the position, size, color, outline, shadow, and bold styling before you start the burn.
Can I fix subtitle timing first?
Yes. Use the sync controls to shift all enabled tracks or adjust their speed scale before encoding the video.
Why does burning subtitles take a while?
Burn-in re-encodes every video frame so the captions become part of the pixels. The first use also downloads the FFmpeg browser engine.
Can I cancel a burn-in job?
Yes. Cancel stops the current encode. You can adjust the files or settings and start again.
Will large videos work?
Large videos can require substantial browser memory and may fail on some devices. If that happens, try a shorter clip or a smaller resolution.
How is burn-in different from soft-embedding?
Burn-in makes captions permanent and visible on any player. Soft-embedding adds a separate track that viewers can turn on or off.