Lossy vs lossless compression
Lossy compression makes a file smaller by permanently discarding some image detail, while lossless compression shrinks the file without throwing anything away. JPG and default WebP are lossy; PNG and lossless WebP keep every pixel. Lossy produces smaller files, and lossless keeps perfect quality.
When lossy is the right choice
Photographs handle lossy compression well because the eye does not miss the fine detail that gets removed. This is why JPG is the standard for photos on the web, where small file size keeps pages fast.
When to stay lossless
Graphics with sharp edges, text, or flat color, like logos and screenshots, look best lossless. Lossy compression can smear their crisp edges, so PNG or lossless WebP is the safer pick.
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Frequently Asked Questions
Does compressing an image lower its quality?
Lossy compression can, though a good tool finds the highest quality that still hits your target size. Lossless compression does not change quality at all.
Which should I use for photos?
Lossy, usually as JPG or WebP. Photos compress well with little visible change and end up much smaller.