Stamp a text watermark in a corner, the centre, or tiled across the picture.
Convert between PNG, JPEG, WebP, AVIF, GIF, BMP, TIFF and ICO — HEIC photos from iPhones included.
Resize to fit, fill-and-crop, exact dimensions or a percentage, in bulk.
Shrink photos for the web: re-encode, optionally downscale, strip metadata, and see the savings.
See what a photo reveals — camera, time, GPS location — and download a clean copy.
Fibonacci ToolBox runs its tools from your browser session and needs JavaScript.