Understand how image compression works and how to shrink file sizes while keeping photos looking sharp — free and private, in your browser.
What 'without losing quality' really means
True lossless compression keeps every pixel identical but only saves a little space. The bigger savings come from lossy compression, which removes detail your eye barely notices. The trick is finding the point where the file is much smaller but still looks the same at normal viewing size.
Compress smartly
Upload your image and adjust the quality. A setting around 80% quality typically cuts file size dramatically with no visible difference. Preview the result before you download.
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Compress Image
Habits that protect quality
- Always compress from the original, not a copy that's already been compressed.
- Resize oversized images to the dimensions you actually need first — this alone saves a lot.
- Use JPEG for photos and PNG for graphics with sharp edges or transparency.
- Compare before and after at 100% zoom to judge real quality loss.
If you need an exact file size instead of a quality slider, use the compress-to-size tool linked below.