Burn a text watermark into every frame of a video - locally in the browser, no upload.
Running locally on your device ...
Running locally on your device ...
0%
Your files never left your device
No. Everything runs in your browser - your file never leaves your device. How this is verifiable
A copyright notice on a preview clip, a company name on a training video, or just a "draft" marker - this tool burns visible text into every frame of the video.
Important and honest: because every frame has to be recomposed, the video is fully re-encoded (no stream copy). That needs a real hardware video encoder in the browser - without one, this tool honestly stops with an error message instead of crashing the tab or producing a broken video.
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 video is not uploaded.
| Input formats | MP4, M4V, MOV, MKV, WEBM |
|---|---|
| Output format | MP4 |
| Batch processing | No |
| Processing | Locally in your browser (WebCodecs) |
| File upload | None |
Limitations: Text watermark only, no image logo. Needs a hardware video encoder in the browser - if none is available, the tool reports that honestly instead of crashing. Full re-encode, so it takes longer than a pure stream copy. One file per run, ~600 MB limit (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 watermarking happens locally in your browser.
Watermarking needs a full re-encode, which requires a hardware video encoder in the browser. If missing, the tool reports that honestly instead of producing a broken result.
No, only text for now.
No, the audio track is carried over unchanged, provided the browser has a matching codec for it.
A small, usual re-encoding loss is unavoidable because every frame is recomposed.
Rotate video · Video speed · Compress video · Video thumbnail · Merge videos · Replace video audio