Reduce the file size of JPG and JPEG photos with a quality slider and instant before/after comparison.
Free Image Compressor
Compress JPG, PNG and WebP images in your browser and compare the before and after sizes instantly.
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How to use Image Compressor
- Add images by dropping them, clicking to browse, or pasting from the clipboard.
- Pick a compression mode or set quality manually, and optionally choose an output format.
- Press “Process images” and compare the before/after preview and sizes.
- Download each result, or grab everything as a ZIP.
About this tool
The Image Compressor re-encodes your photos and graphics at a quality you control, then shows the exact size saved so you can decide whether the trade-off is worth it. It works on JPG, PNG and WebP, and can even aim for a specific target file size.
Recommended settings
Settings we suggest
- Balanced (quality 80) is a sensible default for most photos.
- If a file barely shrinks, try converting it to WebP instead.
- Use the target-size option when you need to stay under an upload limit.
Supported formats
Input: JPG, PNG, WebP, AVIF, GIF, BMP. Output: JPG, PNG, WebP, or the same format as the input.
Input formats
JPGPNGWebPAVIFGIFBMP
Output formats
Same as input JPGPNGWebP
Quality & file size
Lossy formats (JPEG, WebP, AVIF) trade detail for smaller files as you lower the quality; PNG stays lossless regardless of the slider. The tool always shows the original and result sizes so you can judge the trade-off, and it never recommends a result that is larger than your original as an “optimization”.
Privacy
Every image is decoded, transformed and re-encoded entirely in your browser using the Canvas API and a Web Worker. Files are never uploaded, are not stored in localStorage, and are cleared from memory when you remove them or close the page.
More detail: how we process images, security privacy policy.
Common issues & limitations
- Already-optimized images may not get smaller; the tool tells you when that happens.
- PNG is lossless, so quality has no effect on PNG output — use color reduction or WebP instead.
- All processing happens on your device, so the limits protect your own browser rather than a server: 25 MB per file, 20 files per batch, and 40 megapixels per image.
Frequently asked questions
How much can I compress an image?
It depends entirely on the image, which is why the tool shows you the real before and after sizes rather than a promise. A photograph straight from a camera usually has a lot to give; one that has already been compressed once has very little. Flat graphics often do far better as PNG or WebP than as a compressed JPEG.
What happens if the result is larger than the original?
The tool tells you and keeps the original selected, because already-optimized files can grow when re-encoded. You can try a different format instead.
Can I compress to a target file size?
Yes. Enter a target in KB or MB and the compressor searches quality (and, if needed, resolution) to get close to it, then reports whether it succeeded.
Are my images uploaded to a server?
No. Every image is decoded, processed and encoded entirely inside your browser using the Canvas API. The files never leave your device and are discarded when you close the page.
Related tools
Guides that explain this
Longer reads on choosing a format and a quality setting, written around the same trade-offs this tool exposes.