Compress JPG

MozJPEG quality 75 is a good default for photos - visibly indistinguishable from the original for most images while roughly halving the size. Drop toward 60 for web thumbnails where size matters more, and use the before/after slider to see exactly where artefacts start to show on your image.

Yes. MozJPEG is Mozilla's optimising JPEG encoder - the same one Squoosh uses - and produces meaningfully smaller files than a standard JPEG export at the same visual quality, thanks to trellis quantisation and progressive optimisation. The output is still a standard .jpg that opens everywhere.

Yes. Switch the target from Quality to Target kB and enter your budget; the tool searches the JPEG quality that fits under that size for each image, and tells you honestly if a photo cannot reach it without wrecking the quality.

No. Decoding, resizing, compression and ZIP packaging all run inside your browser using WebAssembly codecs. Your images never leave your device and nothing is sent to a server, so it works offline and is safe for private photos.

Yes. Drop multiple files, a folder or a ZIP. Each image keeps its own settings (a new one inherits whatever you last used); to apply the current settings to several at once, select them and use "Apply current settings". Download them individually or as one ZIP.