Image Compress
Reduce image size with adjustable quality (JPEG / WebP)
How does image compression work?
Lossy compression (JPEG, WebP) discards visual information humans rarely notice — high-frequency details, subtle colour variations — to shrink the file. The quality knob trades file size for fidelity. At quality 90 most images are visually indistinguishable from the original; at 50 you'll see artifacts in smooth gradients.
PNG is lossless, so 'compressing' a PNG means re-encoding with smarter palette choices — usually a 5–20% reduction. For dramatic PNG savings, convert to WebP or JPEG (if you can lose transparency).
Common use cases
- Reduce a 5MB phone photo to under 500KB for email or Slack.
- Compress hero images on a website to improve Core Web Vitals (LCP).
- Shrink a screenshot before posting to a forum that limits attachments.
- Reduce a portfolio image set so a download archive fits under cloud storage limits.
Frequently asked questions
What quality setting should I use?
Quality 80–85 is the sweet spot for most photos — half the file size of quality 95 with no visible difference. Drop to 70 for thumbnail or aggressive web compression. Below 60 most images show artifacts.
Can I compress without losing any quality?
Use a lossless format (PNG, WebP lossless) — but the file size reduction is small (5–20%). For large savings, lossy compression is the only option.
Why is my PNG barely getting smaller?
PNG is already efficient for the kind of images it suits (sharp edges, flat colour). For photos in PNG, convert to JPEG or WebP for big savings.
Does compression remove EXIF metadata?
Yes — metadata (camera info, GPS coords) is stripped by default, both for size and privacy. Use a dedicated EXIF tool if you need to preserve it.
Is my image uploaded?
No. Compression runs entirely in your browser; the file never leaves your device.