Image Compressor Without Losing Quality
Most of a photo's file size is data your eyes can't perceive. BigWow's compressor trims that invisible data by adjusting JPEG quantization in your browser — typical results are 60–80% smaller files with zero visible difference. Keep the quality slider at 80–85% for visually lossless results.
80–85% quality is visually indistinguishable from the original for most photos.
Average file size reduction of 60–80% at visually lossless settings.
0 uploads — quantization runs on your CPU inside the browser sandbox.
Frequently Asked Questions
Is it really possible to compress without losing quality?
Visually, yes. JPEG and WebP are designed to discard information the human eye barely registers. At 80–85% quality the savings come from that imperceptible data — you won't see a difference on screen.
What's the best quality setting for no visible loss?
Keep the slider at 80–85%. Below 70%, banding and softness may become noticeable on detailed photos; above 85%, file size savings shrink with no visible gain.
Does this work for PNG screenshots and graphics?
Yes — PNG input works fully. For flat-color graphics and screenshots, PNG output stays sharp; for photos, WebP or JPG output compresses far smaller at equal quality.
Sources & References
- Joint Photographic Experts Group (JPEG) ISO/IEC 10918 quantization tables.
- Google WebP Container Specification for modern lossy compression.
Try it now — 100% free, zero upload
No account, no ads, no file size limits. Opens instantly in your browser.