Video Watermarker
Overlay an image watermark on a video, with a choice of position, size and opacity, in your browser.
Runs in your browser Your input never leaves your device.
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About this tool
Choose a video and a watermark image, such as a PNG logo, then pick where it goes (any corner or the center), how big it is (a share of the video width, from 10% to 50%) and how opaque it is. The tool overlays it using ffmpeg in WebAssembly, 10 pixels from the edges. The logo keeps its proportions, and a PNG with transparency keeps its see-through areas. The video is re-encoded to MP4 while the audio is copied unchanged, and the result is named after your video. There is no text option. It runs in your browser and nothing is uploaded. The first run downloads the ffmpeg engine (about 25 MB) from this site, which can take from a few seconds to a minute on a slow connection; later runs on the same page reuse it.
How to use it
- Choose the video as File 1.
- Choose the watermark image, ideally a PNG logo, as the second file.
- Pick the position, size and opacity, then press Process and wait; re-encoding is slow.
- Preview and press Download.
Common problems
- The watermark is too big or too small
- Pick a smaller or larger size. It is a share of the video width, so it looks the same on any resolution.
- I need text as a watermark
- Only image watermarks are supported. Make a PNG of your text in an image editor and use that.
- It is slow, or the tab freezes or runs out of memory
- ffmpeg runs in a single browser thread on your device. Use a shorter or smaller file and close other heavy tabs.