Choosing the right image format is crucial for web performance. Making the wrong choice can lead to massive file sizes that slow down your site and ruin your SEO.
The Big Three
- JPEG: Best for photographs. Uses lossy compression to achieve small file sizes but does not support transparency.
- PNG: Best for graphics with flat colors, text, or logos. It supports alpha-channel transparency and uses lossless compression (higher quality, but much larger file sizes).
- WebP: The modern standard developed by Google. It supports both lossy and lossless compression, AND transparency, often at file sizes 30% smaller than JPEG or PNG.
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The Verdict
Whenever possible, serve your images as WebP. All modern browsers now support it, and the bandwidth savings are simply too good to ignore. If you have legacy constraints, fall back to JPEG for photos and PNG for transparent graphics.