Drop images here or click to browse
Supports JPG, PNG, WebP · Multiple files · All processing is local — no upload
Compression Settings
10% (smallest)55% (balanced)100% (lossless)
How Image Compression Works
JPEG compression uses discrete cosine transform (DCT) to discard high-frequency detail that's less visible to the human eye. A quality of 80–85% typically reduces file size by 60–75% with barely perceptible quality loss. PNG uses lossless LZW compression — lowering quality converts it to JPEG internally. WebP (from Google) achieves 25–35% smaller files than JPEG at equivalent quality, with support in all modern browsers since 2020.
Use the Compress Image Online Free above — enter your values and get instant results. This free online tool calculates compress image online without losing quality without any download or signup required. Results update in real time as you type.
Use the Compress Image Online Free above — enter your values and get instant results. This free online tool calculates how to reduce image file size free without any download or signup required. Results update in real time as you type.
For web images: 75–85% quality hits the sweet spot — files are 60–75% smaller with barely noticeable quality loss. For photos to print: 90–95%. For thumbnails and avatars: 60–70%. WebP at 80% quality typically looks as good as JPEG at 90% while being 25-35% smaller. For PNG screenshots or graphics with text, keep at 100% (or switch to PNG output to keep lossless).
No. All compression happens in your browser using the Canvas API and JavaScript. Your images never leave your device. This also means compression works offline once the page loads, and there's no file size limit imposed by a server.