Free Image Compressor Online
Compress JPG, PNG, and WebP images instantly. No signup required. Reduce file sizes by up to 90% while maintaining excellent quality.
How to Compress an Image Online
- Click the upload area (or drag and drop) to select a JPG, PNG, or WebP file from your device.
- Pick an output format: WebP gives the smallest file size for most images, JPEG is the safest choice for maximum compatibility, and Original keeps your source format unchanged.
- If the image is larger than you need, drag the Max Width slider down — most web pages only ever display images at 1920px wide or less, so shrinking a 4000px photo down to 1920px alone can cut its file size by more than half before any compression is even applied.
- Adjust the Quality slider. 85-90% is usually indistinguishable from the original to the human eye while still shrinking the file substantially; going below 70% starts to introduce visible artifacts on detailed photos.
- Click Compress & Download. The compressed file downloads straight to your device — nothing is sent to a server at any point.
WebP vs JPEG vs PNG: Which Format Should You Use?
| Format | Best for | Typical file size |
|---|---|---|
| WebP | Photos and graphics on websites; supported by all modern browsers | Smallest (25-35% smaller than JPEG at equal quality) |
| JPEG | Photos where maximum compatibility matters (email, older software, printing) | Small, but larger than WebP |
| PNG | Screenshots, logos, and images that need transparency or sharp text/edges | Largest, but lossless |
Frequently Asked Questions
Does compressing an image reduce its quality?
With lossy formats like JPEG and WebP, yes, to a degree — but at 80-90% quality the difference is rarely visible to the eye while the file size drops significantly. Choosing "Original" on a PNG keeps compression lossless, so quality is unaffected.
What's the difference between resizing and compressing?
Resizing (the Max Width slider) reduces the actual pixel dimensions, so there's less image data to store in the first place — often the biggest single win if you don't need full resolution. Compression keeps the dimensions the same but encodes the pixel data more efficiently.
Is there a limit on file size or number of images?
No artificial limit — since compression happens in your browser rather than on a server, you're only bound by your own device's memory.
Smart Compression
Uses WebP format and intelligent resizing to maintain quality while reducing file size by 60-90%.
100% Private
All compression happens in your browser. Your images never leave your device.
Lightning Fast
Instant compression with no server uploads or processing delays.