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Image Watermark

Add text or image watermarks to your photos. Full-screen tiling or single watermark, opacity, rotation, custom fonts and colors. 100% browser-side processing, no upload.

Click or drag image here

Supports JPG / PNG / WebP / AVIF (GIF: first frame only)

How It Works

The image watermark tool runs entirely in your browser. No data is ever uploaded to any server.

1. Local Loading: The source image and watermark are loaded into browser memory via Canvas. Original files are never modified or transmitted.

2. Watermark Compositing: The Canvas rendering engine overlays text/image watermarks with your chosen opacity, rotation, and layout. Text watermarks support custom fonts and colors.

3. Tiling Algorithm: In tile mode, spacing is automatically calculated based on watermark dimensions to ensure seamless full-image coverage without edge gaps.

4. Local Export: After compositing, a new image is generated locally. Supports JPG/PNG/WebP formats. GIF images are processed as static (first frame only). All local, one-click download.

FAQ