Burn subtitles into video: write SRT or VTT permanently into the picture
With this tool you can burn subtitles into a video: add the video and an SRT or WebVTT file, choose font size, colour and position, and the text is written permanently into the picture. The result is a new video in which the subtitles show everywhere. Everything runs in your browser and nothing is uploaded.
Source: MDN – VideoEncoder.configure(): bitrate in Bit pro Sekunde. Updated: .
How it is calculated
Burn subtitles into video: what it means
Burned-in subtitles (“hardsubs”) are part of the picture. You cannot switch them off, but they appear in every player, on every platform and in every messenger preview. That helps with videos in social networks that play without sound and with devices that do not show a subtitle track. This tool recalculates every frame and writes the text onto it.
How it works
- Drag the video in or choose it (MP4, MOV, WebM or MKV).
- Paste subtitles as SRT or WebVTT or choose a file. The tool shows how many entries it found.
- Choose font size, position, colour and background; the preview shows a still frame.
- Click “Burn subtitles in”, check the result and download it.
What to watch out for
- Timing: if the subtitles do not match the sound, fix them first with the subtitle shifter.
- Character set: SRT files should be UTF-8. The tool detects older files in Windows encoding automatically.
- Quality and size: the video is re-encoded (MP4 with H.264, otherwise WebM). Quality stays high, but the file can end up larger or smaller than the original. Compress video helps afterwards.
- Sound: the audio track is kept.
- Browser: you need a current browser with WebCodecs (Chrome, Edge, Safari). The open-source library Mediabunny (MPL-2.0) reads and writes the video files and is loaded only when you add the first video.
Privacy
The video is read from your device piece by piece; there is no upload and no server that sees it.
Frequently asked questions
What does it mean to burn subtitles into a video?
The subtitle is written permanently into the picture. It then shows in every player but can no longer be hidden.
Is my video uploaded?
No. The video is read and processed in your browser. It never leaves your device.
Which subtitle formats work?
SRT and WebVTT. Times are written like 00:00:01,000 --> 00:00:04,000 and entries are separated by blank lines.
Why does burning take so long?
Every frame of the video is recalculated and encoded. How long it takes depends on your device, the resolution and the length. Keep the tab open meanwhile.
Is the sound kept?
Yes, the audio track is kept. Only the picture is re-encoded.
Sources and legal basis
- MDN – VideoEncoder.configure(): bitrate in Bit pro Sekunde
- MDN – EncodedVideoChunk.type (key/delta)
- ITU-T H.264 – Advanced video coding for generic audiovisual services
- Mediabunny 1.61.0 – Vanilagy (MPL-2.0), Quelltext
- Licenses of the media tools (MPL-2.0)
- W3C – WebVTT: The Web Video Text Tracks Format (Zeitangaben, Cue-Blöcke)
- Matroska-Spezifikation – SubRip (SRT) Codec (Zeitangabe HH:MM:SS,mmm --> HH:MM:SS,mmm)
As of: · Editorial policy
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