A Practical Guide to Image Codecs and Compression for Web
A practical guide to choosing image formats and compression settings for the web. Learn about modern codecs like WebP and AVIF, and how to use WebPS to balance quality and file size.
Understanding Image Compression
When optimizing images for the web, you're constantly making choices between quality, file size, and loading speed. The [MDN Web Docs image format series](https://developer.mozilla.org/en-US/blog/image-formats-codecs-compression-tools/) explains that modern codecs like WebP and AVIF offer better compression efficiency than traditional JPEG and PNG. However, the right choice depends on your specific use case.
Key Codecs Compared
- **JPEG**: Good for photographs, lossy compression, widely supported.
- **PNG**: Lossless, supports transparency, larger file sizes.
- **WebP**: Superior lossy and lossless compression, smaller files, well-supported in modern browsers.
- **AVIF**: Even better compression than WebP, based on the AV1 codec, but slower to encode.
*Source: MDN Blog, Nov 2025*
Compression Techniques
Image compression can be lossy (discarding some data) or lossless (retaining all data). The MDN series highlights experimenting with codecs, quality metrics, and tools to balance efficiency and visual fidelity. Finding the right quality setting can significantly reduce file size without a noticeable drop in quality.
Using WebPS for Compression
[WebPS](https://webps.com), a powerful online image editor built on miniPaint, makes compression straightforward. When you export your image, you can choose from modern formats like WebP and AVIF, and adjust the quality slider to see how file size changes. The editor’s real-time preview helps you decide the best balance for your project. With features like non-destructive editing and support for large images (v4.6.1 miniPaint, Feb 2021), WebPS ensures your workflow stays efficient.
Quick Tips for Web Performance
- Start with the right format: Use WebP for photographs, PNG for graphics with transparency, and AVIF for future-facing projects.
- Compress intentionally: Reduce quality slightly to drastically cut file size.
- Test on real devices: What looks good on your monitor might load slowly on mobile.
By combining knowledge of image codecs with practical tools like WebPS, you can keep your pages fast and your visuals crisp.