Reduce the file size of JPG and JPEG photos with a quality slider and instant before/after comparison.
Open toolFree 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
- 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: JPEG, PNG, WEBP, AVIF, GIF, BMP. Output: JPEG, PNG, WEBP.
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 “optimisation”.
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.
Common issues & limitations
- Already-optimised images may not get smaller; the tool tells you when that happens.
- PNG is lossless, so quality has no effect on PNG output — use colour reduction or WebP instead.
- All processing happens on your device; nothing is uploaded, so very large batches are limited by your available memory.
Frequently asked questions
How much can I compress an image?
It depends on the image. Photos often shrink 40–80% at quality 80 with no visible loss. Flat graphics may compress far more when converted to PNG or WebP.
What happens if the result is larger than the original?
The tool tells you and keeps the original selected, because already-optimised 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.