Frequently asked questions
Does compressing images reduce quality?+
At 80% quality, the difference is nearly invisible to the human eye. You can use the quality slider to balance file size and visual quality. WebP format gives the best quality-to-size ratio — 25–35% smaller than JPEG at the same quality.
Are my images uploaded to a server?+
No. All compression happens inside your browser using the Canvas API. Your images are never sent to any server. 100% private and works offline after the page loads.
What is the best format for web images?+
WebP is the best format for most web use cases — it produces images 25–35% smaller than JPEG at the same visual quality. All modern browsers support WebP. Use PNG only for images that need transparency.
Is there a file size limit?+
Free users can compress up to 25MB per file and 10 images at a time. Pro users get unlimited file sizes and batch processing with ZIP download.