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Video Watermarker & Logo Inserter

Add custom text or PNG logo watermarks to MP4, WebM, MOV, and AVI videos directly in your browser using FFmpeg WebAssembly. Full opacity, positioning, and scale control with zero server uploads.

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How to use this tool

  1. Upload or drag and drop your video file (MP4, WebM, MOV, AVI, or MKV) into the watermarker workspace.

  2. Choose between 'Text Watermark' (type text, select font size and color) or 'Image / Logo Watermark' (upload your PNG logo).

  3. Select the watermark placement (Top-Left, Top-Right, Center, Bottom-Left, or Bottom-Right).

  4. Adjust the opacity slider (20% to 100%) and inspect the live watermark overlay on the preview video.

  5. Click 'Apply Watermark' to burn the watermark into your video frames locally via WebAssembly.

  6. Preview the final watermarked video and download the protected output to your device.

Frequently asked questions

Quick answers about file privacy, processing modes, formats, and device support.

The tool converts your watermark text or uploaded PNG logo into a high-resolution transparent asset and uses FFmpeg's geometric overlay and colorchannelmixer filters inside an isolated WebAssembly sandbox to bake the watermark directly into every frame.
Yes! You can upload transparent PNG, JPG, or WebP logo images. You can adjust the scale relative to your video width and fine-tune opacity to your preference.
Never. All video rendering and watermark compositing take place 100% locally in your browser's WebAssembly memory. Files never leave your computer.
Yes. The engine uses stream copy mode (-c:a copy) to preserve the original audio track without any generational loss or re-encoding.
You can watermark MP4, WebM, MOV, AVI, and MKV video files. The exported video includes FastStart headers for immediate web playback.

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