Compress Images on Mac & Windows — Free JPG/PNG Compressor, No Install
Last updated: March 20265 min readImage Tools
Image Compression on Desktop — Your Options
Mac and Windows both lack good built-in image compression. Mac Preview can reduce JPG quality on export but ignores PNG. Windows has nothing built in. Photoshop costs $22/month. Browser tools fill the gap with zero friction.
| Method | Platform | JPG | PNG | WebP | Cost |
|---|
| Photoshop | Mac/Win | ✓ Full control | ✓ Full control | ✓ Yes | $22.99/mo |
| Mac Preview | Mac only | ~Basic export quality | ✗ No PNG compression | ✗ No | Free |
| Windows Photos | Windows | ✗ No compression | ✗ No | ✗ No | Free |
| TinyPNG (web) | Any | ✓ Good | ✓ Good | ✓ Yes | Free (20/day limit) |
| Browser-local tool | Any | ✓ Adjustable quality | ✓ Lossless + lossy | ✓ Yes | Free — unlimited |
How to Compress on Mac
- Open Compress Image in Safari or Chrome
- Drop your image — JPG, PNG, WebP, or any common format
- Adjust quality — slide from maximum quality (slight compression) to maximum compression (more aggressive)
- Download — the compressed image saves to your Downloads folder
Mac tip: Drag images directly from Finder or Photos into the browser tool. On M1/M2/M3 Macs, compression is nearly instant even for large images.
How to Compress on Windows
- Open Compress Image in Chrome or Edge
- Drop from File Explorer — or paste from clipboard
- Select quality and download
JPG vs PNG Compression — Different Approaches
| Format | How It Compresses | Typical Savings | Best For |
|---|
| JPG | Lossy — removes visual data humans rarely notice | 40-70% smaller | Photos, screenshots with gradients |
| PNG | Lossless — reorganizes data without losing anything | 20-50% smaller | Screenshots, logos, text-heavy images, transparency |
| WebP | Both lossy and lossless modes available | 30-60% smaller | Web images (supported by all modern browsers) |
The tool automatically detects your image format and applies the appropriate compression method.
Quality Settings Guide
- 90-100% quality: Minimal compression, ~20% size reduction. Use for photography portfolios or print
- 75-85% quality: Good balance — 40-60% size reduction. Use for web, email, social media
- 50-70% quality: Aggressive — 60-75% reduction. Use for thumbnails, quick previews, bulk storage cleanup
- Below 50%: Very aggressive. Visible artifacts on zoom. Only for tiny thumbnails or situations where file size matters more than quality
After Compressing — Common Workflows
- Resize Image — further reduce size by lowering pixel dimensions
- Convert Format — switch from PNG to JPG (or vice versa) for better compatibility
- Crop Image — remove unnecessary parts to reduce content and size
- Strip EXIF — remove metadata (location, camera info) to reduce file size slightly and improve privacy
Blog