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Watermark Settings
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Drop video here or click to upload
Add text watermark | Supports MP4, WebM, MOV | Max 500MB
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Videos are processed entirely in your browser. Nothing is uploaded.
See exactly where your watermark will appear before processing.
Custom text, font size, color, opacity, and 9-position placement.
No library loading required. Start processing immediately.
Add a watermark to video online free with FreeToolBox — embed a text or image watermark onto every frame of your video in your browser using FFmpeg.wasm. Video watermarking is essential for content creators who want to protect their videos from unauthorized use, assert copyright, or brand their content before distributing it on YouTube, TikTok, or Instagram. Choose watermark text or logo image, set position, size, and opacity, and download the watermarked video.
All processing happens locally in your browser using WebAssembly — your video is never uploaded to any server. The only watermark on the output is the one you add. Completely free, no account required.
Yes. Upload a PNG logo (ideally with a transparent background) and it will be composited onto each video frame at your chosen position and opacity. PNG transparency is preserved when overlaying on the video.
For a subtle brand mark: 20–40% opacity. For a clear copyright notice: 50–70%. Fully opaque watermarks (100%) block content and are typically only for preview/draft versions.
Yes. Adding a watermark requires processing every video frame, involving re-encoding the video stream. The audio stream is typically copied without re-encoding.
No. FFmpeg.wasm processes your video entirely in the browser. Your file never leaves your device.