Every tool you could want to edit images in bulk

Yes. There is no account, no sign-up, no watermark and no limit on how many images you process. Because everything runs in your browser, we have no server costs to pass on.

No. Your images are read into your browser's memory and processed on your own device. They never travel to a server. You can verify this by disconnecting from the internet after the page loads — the tool keeps working.

There is no hard limit. In practice a few hundred is comfortable on a desktop. On a phone, browsers cap how much image memory a tab can use, so very large batches or very large photos may fail there.

Fit inside scales your image so it fits within the target size without cropping, so the output may be smaller than the size you picked. Fill and crop scales and trims so the output is exactly the size you picked. Use Fill and crop when every image must be identical dimensions, such as a Shopify catalogue.

WebP for almost everything on a website — it is around 25–35% smaller than JPEG with universal browser support. AVIF for large hero images where the extra compression is worth slower encoding. JPEG if you are uploading to a platform you do not control.

AVIF encoding is computationally expensive and browsers do not include an AVIF encoder, so ShrinkFox downloads a WebAssembly encoder the first time you select it. That takes a few seconds, then each image takes a second or two to encode.

JPEG, WebP and AVIF are lossy formats, so yes — some data is discarded. At quality 80 the difference is invisible on most photographs. PNG is lossless, which is why the quality control is disabled when you pick it. Always keep your originals.

Yes. Open the crop screen and each image keeps its own crop box and aspect ratio. If you want the same crop everywhere, tick Apply this crop to all images and it will be applied, clamped to each image's bounds.