💧 Bulk Watermark Adder

The watermark size is calculated as a percentage of the image's smaller dimension (width or height). For example, at 5% on a 1000px image, the watermark will be about 50px tall. This ensures consistent appearance across all image sizes — from small thumbnails to large high-res photos.

You can process up to 50 images at once. Larger batches may take longer depending on image sizes, but all processing happens locally in your browser. For best performance, 20-30 images at a time is recommended.

No! Your original images remain completely untouched. The tool creates watermarked copies that you download. Originals are never modified, uploaded, or stored anywhere. You keep full ownership and control of your files.

Corners: Standard placement, subtle branding. Center: More visible, good for proof sheets. Tile: Repeats the watermark across the entire image — best for preventing theft as it's nearly impossible to remove without damaging the image.

You can download as PNG (lossless, best for text), JPEG (compressed, smaller file size), or WebP (modern format with good compression). Quality can be adjusted from 75% to 100% for JPEG and WebP formats.

Absolutely! All processing happens locally in your browser using JavaScript Canvas API. Your images never leave your device — no uploads, no servers, no third parties. This makes it 100% secure for client work, personal photos, or any sensitive images.