Watermark video
Overlay a logo image on a clip. Drop the clip first, then the logo.
Runs in this tab. The file stays here.
This runs in your browser. Nothing is uploaded. Longer clips take longer here than they would on a fast server — that is the trade-off for not sending the file.
About Watermark video
Overlays a logo image on a clip with FFmpeg in the browser. Drop the clip first, then the logo. Nothing is uploaded.
This is a single overlay at X/Y, not a tiled legal department. Opacity lives in the PNG’s alpha. A JPEG logo is a solid rectangle. Text watermarks for stills are a different tool.
Watermark video runs FFmpeg compiled to WebAssembly in this tab. The first visit of a video or audio tool fetches about 30 MB from this origin; after that it can stay cached. Your file is not in that download and is not POSTed anywhere. GPL FFmpeg, single-thread, same origin, no COEP experiment. That is the same encoder as convert, trim, and compress — this page is just a different argument list, with the same honesty about what the core cannot mux.
You can open the network panel and watch. Encoding a long clip on a phone is slow because it is your CPU. That wait is the trade for not handing the file to a converter you found in a search ad. Reverse and boomerang cap duration so a two-hour file does not try to live backwards in RAM. If a codec inside a familiar extension is missing from this core, you get an error rather than a silent broken file. Subtitle generation and stem splitting are not here; I will not pretend they are. Missing is better than a watermarked demo.
How to use Watermark video
- 1Drop the clip, then add the logo image.
- 2Set overlay X and Y.
- 3Click Watermark, then download.
What it won't do
- One logo, one position.
- Clip first, then image.
Common questions
Does watermarking a video upload either file?
No. Both stay in the tab.
Can I use text instead of a logo?
Not on this page. Draw the text into a PNG and overlay that, or use the image watermark tool on a frame.
Will this survive a recode on YouTube?
The pixels will be recoded. A tiny logo in a corner may vanish into compression. That is not this tool’s fault.
Related tools
Why this one doesn't upload your file
There is no server to upload to. This page is a static file, and the work happens in your browser using the same graphics and WebAssembly code that renders every other site you visit. Your file is read from disk into memory, processed, and handed back as a download. Once the page has loaded you can disconnect from the network entirely and it keeps working. The longer explanation