WebP
Definition
A modern image format that creates smaller files than JPEG or PNG with similar quality. Developed by Google, it speeds up websites significantly.
What is WebP?
WebP is a modern image format developed by Google that provides superior compression compared to JPEG and PNG. The same image in WebP format is typically 25-35% smaller than JPEG while maintaining equivalent quality.
Since images often account for half of a page's file size, WebP can significantly improve loading speed.
WebP vs Other Formats
| Format | Best For | Transparency | Animation | File Size |
|---|---|---|---|---|
| WebP | Most uses | Yes | Yes | Smallest |
| JPEG | Photos | No | No | Medium |
| PNG | Graphics, transparency | Yes | No | Larger |
| GIF | Simple animations | Limited | Yes | Large |
Advantages of WebP
Smaller Files
25-35% smaller than JPEG for equivalent quality. For a 500KB image, that's 125-175KB saved.
Supports Transparency
Unlike JPEG, WebP handles transparent backgrounds – often at half the file size of PNG.
Supports Animation
Animated WebP files are much smaller than GIFs.
Wide Browser Support
All modern browsers support WebP – Chrome, Firefox, Safari, Edge. Only very old browsers lack support.
Using WebP on Your Website
Automatic Conversion
Many platforms handle WebP automatically:
- WordPress plugins like ShortPixel or Imagify
- Cloudflare's image optimisation
- Next.js built-in image component
- Shopify's CDN
Fallback for Old Browsers
<picture>
<source srcset="image.webp" type="image/webp">
</picture>
This serves WebP to supporting browsers and JPEG to others.
Impact on Performance
Converting a typical website's images to WebP can:
- Reduce total page size by 15-25%
- Improve LCP (Largest Contentful Paint)
- Speed up mobile loading significantly
- Reduce hosting bandwidth costs
There's no reason not to use WebP on modern websites.