Free Online Video Watermark Tool
Add a text or image watermark to any video — choose your position, size, and opacity. Everything runs in your browser using FFmpeg.wasm. No uploads, no account, completely free.
Drop your video here or click to browse
MP4, WebM, MOV, AVI, MKV — watermark will be appliedHow to add a watermark to a video
Frequently asked questions
Can the watermark be removed from the output?
No — the watermark is burned directly into the video frames during re-encoding. It cannot be removed without access to the original unwatermarked file. This is intentional for copyright protection purposes.
What image formats work for image watermarks?
PNG is strongly recommended because it supports transparency (alpha channel). A PNG logo with a transparent background will overlay cleanly on the video. JPG images have no transparency and will show a solid rectangle behind the watermark.
What opacity should I use?
For copyright protection, 50–70% opacity is a good balance — visible enough to deter removal but not so dominant it distracts from the content. For subtle branding, 30–40% works well. For an obvious visible watermark, 80–100% opacity is clear and unmissable.
Is my video uploaded to a server?
No — everything runs locally using WebAssembly (FFmpeg.wasm). Your video never leaves your device.
Will the watermark affect video quality?
Adding a watermark requires re-encoding the video, which involves some quality trade-off compared to the original. The output uses H.264 at CRF 23 (high quality) so the difference is minimal and hard to notice.
