What is the difference between Quality First and Size First?
Quality First preserves the image's original dimensions and only lowers JPG/WebP quality to hit the target. Size First also reduces dimensions if quality alone can't reach the target — useful for very strict KB caps.
What if my image can't be compressed to the target?
You'll see a warning per image. The tool offers one-click switches to Size First mode or to switch the format to WebP, which usually fits the target.
Are my images uploaded to your server?
No. All images are processed locally in your browser using JavaScript and WebAssembly. Your files never leave your device, and we have no infrastructure that could receive them.
Can I compress multiple images?
Yes. You can drop a batch of images (or an entire folder) and download the compressed results as a single ZIP file with the original folder structure preserved.
Which formats are supported?
JPG, PNG, WebP and AVIF are supported when available in your browser. The Auto mode picks the smallest modern format your browser can encode.
Can I compress images to a specific size?
Yes. Use the
Compress to KB tool to target 100KB, 200KB, 500KB, 1MB or any custom size.
Do I need an account?
No. There is no signup, no login, and no payment. The tool works as soon as the page loads.