How to compress images online for free

Compressing images reduces their file size without any noticeable drop in visual quality. Smaller images load faster on websites, use less storage, and are quicker to share by email or messaging apps.

CuroImage’s compressor runs entirely inside your browser using the HTML5 Canvas API. Your photos never get uploaded to any server — everything happens locally on your device, making it the most private image compressor available.

What compression quality should I use?

For most photos, a quality setting between 70–80% gives excellent results — the difference is invisible to the eye but the file can be 60–80% smaller. For images with text or sharp lines, use 85–90% to preserve clarity. For casual sharing, 60% is often fine.

Which formats can I compress?

You can compress JPG, PNG, WebP, and GIF images. For the smallest file sizes on the web, convert to WebP first then compress — WebP files are typically 30–40% smaller than equivalent JPGs.