Burn SRT, WebVTT or ASS subtitles permanently into a video's picture - locally in the browser, no upload.
Running locally on your device ...
Running locally on your device ...
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Your files never left your device
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No re-upload neededThese tools accept .MP4 - your file is handed over directly.
No. Everything runs in your browser - your file never leaves your device. How this is verifiable
A reel for a platform without its own subtitle display, a training video that should always run with text, or a foreign-language recording with a permanently visible translation - this tool draws the lines of an SRT, WebVTT or ASS subtitle file directly into every frame of the video ("hardsub"), instead of producing a separate, toggleable track.
Drop exactly one video and exactly one subtitle file at the same time - the tool automatically recognizes which file plays which role (by file type/extension, not by drop order). The subtitle input format is auto-detected (SRT, WebVTT or ASS/SSA). Because burned-in text becomes part of the pixels, it can no longer be hidden or switched to another language afterwards - unlike a real subtitle track.
Everything runs locally in the browser with mediabunny (MPL-2.0, self-hosted, no third-party CDN) on the browser's native WebCodecs API. Your files are not uploaded. For a real, toggleable subtitle track, use the sibling SRT/VTT conversion tools instead.
| Input formats | MP4, M4V, MOV, MKV, WEBM, SRT, VTT, ASS, SSA |
|---|---|
| Auto-conversion | PNG, GIF |
| Output formats | MP4, WebM |
| Batch processing | Yes |
| Processing | Locally in your browser (WebCodecs) |
| File upload | None |
Limitations: Needs exactly one video and exactly one subtitle file with at least one recognizable line. VTT position/alignment cues are ignored - every line appears bottom-centered. Full re-encode (every frame is redrawn), so it needs a hardware video encoder in your browser; without one, the tool says so honestly instead of producing unusable or crashing output. Each file ~600 MB limit individually (the browser tab's memory limit: without streaming support the file must fit in whole, with streaming it rises to about 1 GB).
No. The whole burn-in happens locally in your browser.
No. Burned-in text is part of the pixels and cannot be removed again - for that you would need a real, separate subtitle track instead of a hardsub.
SRT, WebVTT and ASS/SSA - the format is automatically detected from the content.
Every frame is redrawn onto a canvas before it is encoded - on a pure software encoder that can crash the browser tab. Without a hardware encoder the tool honestly reports that instead of risking it.
Convert SRT to VTT · Convert VTT to SRT · Subtitle to text · Convert video · Crop video · Record your screen