How to Compress Images Without Losing Quality
Shrink images without making them blurry. Use resizing, the right format and 90% JPG or WebP — free, private, no upload. Files stay on your device and work offline.
Why images get large
A phone photo is often 4000×3000 px, 5–8 MB. For web, email or slides you rarely need that many pixels. Extra pixels = extra bytes. Compression works by removing pixels (resize) and by smart encoding (JPG/WebP quality).
Steps — compress without visible loss
- Resize to needed size: Open Image Resizer. If an image is 4000 px wide but your page shows 1200 px, resize to 1200 (keep aspect ratio). This alone cuts ~70% size.
- Pick the right format:
• Photo → JPG or WebP
• Graphic/logo with sharp edges or transparency → PNG or WebP
Need help? See PNG vs JPG vs WebP. - Export at the right quality: In Image to JPG or Image to WebP choose 85–90% for JPG, 80–85% for WebP. At 90% you keep detail but drop ~40% bytes vs 100%.
- Download & check: Compare zoomed 100% — edges stay sharp, no blocks. If file still large, try WebP or resize a bit more.
Compress now — private & offline
Open Image Resizer →Resize + convert to JPG 90% or WebP in one flow
Lossy vs lossless — plain terms
| Method | How it saves | Quality | When to use |
|---|---|---|---|
| Resize (fewer pixels) | Removes pixels | No loss per pixel, just smaller | Always first step if image is too large |
| JPG quality 90% | Discards invisible detail | Visually lossless | Photos for web/email |
| WebP 80% | Smarter encoding | Visually lossless | Smallest for web with transparency |
| PNG | Lossless | Perfect | Keep for editing, not for smallest web |
Common mistakes to avoid
- Saving the same JPG again and again at low quality — each save adds loss. Keep a master PNG/JPG at 90%+ and export copies.
- Upscaling a small image — makes it blurry, not sharper. Only downscale.
- Using PNG for photos — PNG is larger than JPG/WebP for photos. Use PNG only for graphics/screenshots.
Tools for this — all private, no upload
FAQ
Will 90% look worse?
At normal viewing distance, no. At 100% zoom, 90% keeps edges sharp and removes only invisible noise. 85–90% is the sweet spot for photos.
Can I compress without resizing?
Yes — just convert at 90% JPG or 80% WebP. You’ll still save ~30–40% with no visible loss.
Is it private?
Yes. Images are processed locally via canvas. No upload, works offline after load.
Part of the Image Tools cluster. Also see How to Convert HEIC to JPG and PNG vs JPG vs WebP.