Image Compressor & Optimizer
Compress and optimize images locally. No upload required—everything happens in your browser.
Drop images here or click to browse
Supports all image files
How Image Compression Works
Image compression reduces file size by removing redundant data while preserving visual quality. There are two main types:
Lossy Compression
Permanently removes some image data to achieve smaller files. JPEG uses this—quality slider controls how much data is discarded. Lower quality = smaller file, more artifacts.
Lossless Compression
Reduces file size without losing any data. PNG uses this for graphics with transparency. Perfect reconstruction but larger files than lossy.
This tool uses the HTML5 Canvas API to perform lossy compression directly in your browser. Your images never leave your device—no server upload required.
Image Format Comparison
| Format | Compression | Transparency | Best For |
|---|---|---|---|
| JPEG | Lossy | ✗ | Photos, complex images with gradients |
| PNG | Lossless | ✓ | Graphics, logos, screenshots, icons |
| WebP | Both | ✓ | Web images (25-35% smaller than JPEG/PNG) |
| AVIF | Both | ✓ | Modern web (50% smaller than JPEG) |
| GIF | Lossless | ✓ | Simple animations, limited colors (256) |
| SVG | Vector | ✓ | Icons, logos, scalable graphics |
Quality Setting Guide
Near-lossless quality. Best for professional photography, print materials. Minimal file size reduction.
Optimal balance for web images. Imperceptible quality loss, 60-80% file size reduction. Industry standard.
Noticeable quality loss on close inspection. Good for thumbnails, previews, or bandwidth-constrained scenarios.
Visible artifacts and blur. Only for extreme size constraints or placeholder images.
Common Use Cases
🌐 Website Performance
Images account for ~50% of page weight. Compression improves load times, SEO rankings, and user experience.
📧 Email Attachments
Stay under email size limits (typically 25MB). Compressed images load faster in email clients.
💾 Storage Optimization
Reduce cloud storage costs. A 5MB photo can often be compressed to under 500KB with minimal quality loss.
📱 Social Media
Faster uploads and better quality control vs platform auto-compression which can introduce artifacts.
Frequently Asked Questions
Are my images uploaded to a server?
No. This tool runs entirely in your browser using the HTML5 Canvas API. Your images never leave your device. All compression processing happens locally using JavaScript.
What quality setting should I use?
70-85% is the sweet spot for most web use. This provides 60-80% file size reduction with virtually no perceptible quality loss. For print or professional work, use 90%+. For thumbnails or previews, 50-60% is acceptable.
Why is my PNG larger after "compression"?
PNGs are lossless, so the quality slider doesn't reduce their size the same way. When converting PNG to JPEG (via quality slider), the file shrinks dramatically but loses transparency. For true PNG optimization, specialized tools like pngquant provide better results.
What's the difference between JPEG, PNG, and WebP?
- JPEG: Best for photos. Lossy compression, no transparency. Smallest files for photographic content.
- PNG: Best for graphics/screenshots. Lossless, supports transparency. Larger files but pixel-perfect.
- WebP: Modern format, 25-35% smaller than JPEG/PNG. Supports both lossy/lossless and transparency. 97% browser support.
How much can I expect to reduce file size?
Results vary by image, but typical expectations:
- Smartphone photos (12MP+): 4-8MB → 200-500KB (90%+ reduction)
- DSLR photos: 10-30MB → 500KB-2MB (85-95% reduction)
- Screenshots: Varies widely based on content complexity
- Already compressed web images: 10-30% additional reduction