Compresser des images par lot

The defaults suit most web and email jobs: quality 80, the long side capped at 1920 pixels and a 1 MB target per file. With those settings our 2400 × 1600 test JPG went from 631,537 to 234,132 bytes, and a 2400 × 1600 PNG from 4,348,538 to 945,151 bytes. Each result shows its new size and the percentage saved, and the totals line adds up the whole batch.

Change a setting and press Apply settings to rerun every file in the list with the new values. If a file does not need compressing, for example a JPG that is already smaller than the target, you get the original back rather than a re-encoded copy that is larger or worse.

Images are compressed in sequence, not all at once, so a batch of 50 large photos does not exhaust your browser’s memory. You can watch the progress, keep adding files while it runs up to the 50-file limit, and remove an image from the list at any point; a removed file is skipped even if it was still waiting. If one file is damaged or in a format the browser cannot decode, it is marked with an error and the rest carry on.

Time depends on your device and on the image sizes, since the work runs on your own processor. A web worker keeps the page responsive while it runs.

Keep original compresses JPGs as JPG, PNGs as PNG and so on. Choosing WebP or JPG instead converts the whole batch in the same pass, which is the quickest way to turn a folder of PNG screenshots into small WebP files for a website. AVIF output is encoded with a WebAssembly encoder and is slower than the others.

Inside the ZIP each file keeps its name with _compressed added, so holiday.jpg becomes holiday_compressed.jpg, and the extension follows the output format. If two results end up with the same name, say photo.png and photo.jpg both converted to WebP, the second is saved as photo_compressed-2.webp instead of overwriting the first.

Most batch compressors send every file to a server and back. Here the decoding, resizing and encoding run in the browser tab, so a folder of client photos, product shots or scanned documents never leaves your computer. There is no account and no daily limit, and closing the tab clears every file from memory.