Image Compression Explained: JPG, PNG, and WebP
Learn the difference between lossy and lossless compression and choose the right web image format.
Learn the difference between lossy and lossless compression and choose the right web image format.
Lossy and lossless compression
Lossy compression removes visual information to create smaller files. It works well for photographs when the quality setting is sensible. Lossless compression preserves the exact pixel data and is useful for graphics, screenshots, and assets that will be edited again.
When to use each format
JPG is a practical choice for photographs without transparency. PNG preserves sharp edges and transparency but can be much larger for photos. WebP supports both lossy and lossless modes and often produces smaller web assets.
- Photos: start with JPG or lossy WebP.
- Logos and interface captures: use PNG or lossless WebP.
- Transparency: use PNG or WebP.
- Archive an editable master separately from the optimized output.
Compare more than file size
Preview the image at its real display size. Inspect text edges, gradients, skin tones, and high-contrast detail. The smallest file is not useful if compression artifacts distract the viewer.
Useful tools for this workflow
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