Batch compress images online — private ZIP
Shrink a whole set of product photos, screenshots, or web images in one pass. Every file stays on your device, including the ZIP.
Done before the upload bar would finish.
Choose or drop up to 20 images.
Pick a format and one quality level for the batch.
Compress everything and download a ZIP or individual files.
What the browser does — and where it stops.
PixelNook re-encodes pixels with your browser’s canvas codecs. File size and visual quality can vary by browser, format, dimensions, and source image; a requested maximum size is a target, not a guarantee.
Browser API referenceReviewed 7 September 2026 · Method and source checked · Automated tests passed
Questions, answered.
Are my images or ZIP uploaded?+
No. PixelNook compresses the images and assembles the ZIP locally in your browser.
How many images can I compress at once?+
You can process up to 20 JPG, PNG, or WebP files in one batch, with a 25 MB limit per source file.
Why can a compressed file become larger?+
Flat graphics and already optimized images can grow when re-encoded. PixelNook shows the result size so you can keep only the useful outputs.