Compress Images Without Losing Quality
Smart compression runs entirely in your browser. No file size limits, no quantity limits. Compare before and after in real time.
Drop images here to compress
PNG, JPG, WebP, AVIF · Up to 50 files · No size limits
100% Private
Files never leave your device. All compression happens locally.
Before & After
Slide to compare original vs compressed. See the difference.
Works Offline
Install as PWA. Compress without internet connection.
Batch + ZIP
Compress up to 50 files at once. Download all as ZIP.
How Image Compression Works
Image compression reduces file size by removing redundant or less-important data while preserving visual quality. There are two types: lossless compression (no quality lost — every pixel is preserved exactly, typically 10-30% savings) and lossy compression (more aggressive savings of 50-90%, with a slight quality trade-off that's usually invisible to the human eye). Our tool uses smart lossy compression — we find the sweet spot where files shrink dramatically but you can't see the difference.
Why Compress Images?
- Faster websites: Images are 60%+ of most web pages. Smaller images = faster load times = better SEO rankings.
- Email attachments: Many email servers reject attachments over 25MB. Compression makes your images sendable.
- Save storage: Compressing your photo library can free gigabytes of space without deleting anything.
- Upload faster: Smaller files upload to social media, CMS platforms, and cloud storage in seconds instead of minutes.
Lossy vs Lossless Compression
Lossless compression works by finding patterns in the data and encoding them more efficiently — like using shorthand for repeated information. The original image can be perfectly reconstructed. PNG uses lossless compression. Lossy compression (used by JPG and WebP) goes further: it analyzes the image and discards information that the human eye is unlikely to notice, like subtle color variations in smooth areas. Our quality slider lets you choose the balance between file size and visual fidelity.
Frequently Asked Questions
Is this tool really free?
Yes — completely free. No registration, no payment, no hidden limits. We support the site through advertising. The compression engine costs nothing to run because all processing happens on your device.
Do my files get uploaded to your server?
No. All image processing happens locally in your browser using the Canvas API. Your files are never uploaded to any server. You can verify this by disconnecting from the internet — the tool still works perfectly.
How much can I compress my images?
JPG and WebP images can typically be compressed 50-85% with minimal visible quality loss at our default 80% quality setting. PNG images can be compressed 10-30% losslessly, or much more if converted to a lossy format.
What formats are supported?
Input: PNG, JPG, WebP, AVIF, GIF, BMP, and more. Output: Auto (keeps original format), PNG (lossless), JPG (smallest), or WebP (best compression-to-quality ratio).