Subtitle Burner

Subtitle Burner features

• 01

  Type or import subtitles

  Add captions one by one with start and end times, or drop in an .srt / .vtt file and fine-tune from there.

• 02

  Full caption styling

  Control font size, text color, outline, bold, a background box and screen position, with a live preview before you render.

• 03

  100% private, no uploads

  FFmpeg runs in your browser via WebAssembly, so footage and subtitles are processed on your device and never uploaded to a server.

Subtitle Burner FAQ

What is the difference between burned-in and soft subtitles?

Burned-in (open) captions are drawn permanently onto the video frames, so they appear on any player — social apps, TVs, anything. Soft subtitles are a separate track viewers can switch off, which not every player supports. This tool burns them in.

Can I import an existing SRT or VTT file?

Yes. Click Import .srt / .vtt and the cues and timings load into the editor, where you can edit the text and restyle before burning.

Will the subtitles show on Instagram, TikTok and YouTube?

Yes — because the captions are burned into the picture, they display everywhere, including on feeds that autoplay without sound.

Is my video uploaded to a server?

No. All processing happens locally in your browser with WebAssembly FFmpeg, so your video stays on your device.

What video formats can I use?

MP4, MOV, WebM, MKV and M4V up to 1 GB. The output is an MP4 with H.264 video and AAC audio that plays everywhere.

Can I change the subtitle font and position?

Yes. You can set the font size, text color, outline color, bold, an optional background box, and place captions at the bottom, middle or top of the frame.