Which format compresses best?

WebP usually produces the smallest files at a given quality; JPG is the most universally supported. Both are available.

Is the Image Compressor free to use?

Yes. Image Compressor is completely free with no sign-up, no watermarks and no usage limits.

Are my files uploaded to a server?

No. Image Compressor runs entirely in your browser — your files and data never leave your device.

Does it work on mobile and offline?

Yes. It works in any modern browser on desktop or mobile, and the toolkit is a PWA that keeps working offline after your first visit.

Image Compressor

Compress JPG, PNG and WebP images to a smaller file size with an adjustable quality slider and live before/after preview — entirely client-side.

How it works

1
Add your images
Drag and drop, paste, or browse. Nothing is uploaded — files are read directly in your browser.
2
Choose your options
Set the options for Image Compressor and preview the result before you export.
3
Process on your device
Image Compressor runs locally on a Canvas, so even large batches are handled quickly and privately.
4
Download
Save a single file, or grab everything at once as a ZIP.

Common uses

Get a large hero image under a page-speed budget without a visible drop in quality.
Squeeze photos below an email or upload attachment limit.
Batch a product gallery down to fast-loading WebP for a faster storefront.

About the Image Compressor

Compress JPG, PNG and WebP images to a smaller file size with an adjustable quality slider and live before/after preview — entirely client-side.

Image Compressor is part of a free, privacy-first toolkit. Everything is processed locally on a Canvas with high-quality pica resampling — there are no uploads, no quality loss from a server round-trip, and no limits.

Because image compressor works without any sign-up or installation, you can use it as often as you like and it's always available — on desktop or mobile, and even offline.

Explore more image tools, or try Image Resizer · Batch Image Resizer.