Are my images uploaded anywhere?

No. Every image is decoded and re-encoded locally in your browser tab — nothing is sent to a server.

What formats can I compress?

Upload JPG, PNG, or WebP. Output is JPG or WebP, since both support the lossy compression that actually shrinks file size.

Yes. Add a batch of images, set a quality level, and compress them all at once — download each one or grab all of them as a zip.

If you choose JPG as the output, transparent areas are filled with white since JPG has no alpha channel. Choose WebP to keep transparency.

Choose a quality level and shrink JPG, PNG, or WebP images — one at a time or a whole batch. Nothing leaves your browser.

+ Add JPG, PNG, or WebP images

Nothing uploaded — images are read straight into your browser tab.

Are my images uploaded anywhere?: No. Every image is decoded and re-encoded locally in your browser tab — nothing is sent to a server.
What formats can I compress?: Upload JPG, PNG, or WebP. Output is JPG or WebP, since both support the lossy compression that actually shrinks file size.
Can I compress more than one image at a time?: Yes. Add a batch of images, set a quality level, and compress them all at once — download each one or grab all of them as a zip.
Will compressing a PNG with transparency lose it?: If you choose JPG as the output, transparent areas are filled with white since JPG has no alpha channel. Choose WebP to keep transparency.