Quick Answer
WebP makes smaller files than JPG at the same quality, about 25-35% smaller for photographs. Use WebP for websites and modern applications. Use JPG when you need compatibility with older systems or when specific software requires it.
WebP vs JPG Comparison
| Feature | WebP | JPG |
|---|---|---|
| Compression | Lossy and lossless | Lossy only |
| Transparency | Yes (alpha channel) | No |
| File size | 25-35% smaller than JPG | Larger |
| Quality | Same or better at smaller size | Good |
| Animation | Yes (animated WebP) | No |
| Browser support | 97%+ (all modern browsers) | Universal (100%) |
| Editing support | Growing | Universal |
| Photo editing apps | Most modern apps | All apps |
| Social media | Accepted | Accepted everywhere |
| Best for | Websites, web apps | Maximum compatibility |
When to Use WebP
- Website images, where smaller files mean faster page loads and better SEO rankings
- Web applications, to cut bandwidth costs and improve the user experience
- Progressive web apps, for better performance on mobile and slow connections
- Animated images, since WebP animations are smaller than GIF
- Images that need transparency, because WebP supports alpha channels like PNG
- Modern email clients, where WebP support is growing
When to Use JPG
- When your audience might use very old browsers or software
- Photo printing, since most print services prefer JPG
- Legacy systems, as older image editing or CMS software may not support WebP
- Email attachments to unknown recipients, where JPG is the safest choice
- Government or corporate forms, because some systems only accept JPG
- Social media uploads, which platforms often convert to JPG anyway (though most accept WebP)
Web Performance Impact
Switching from JPG to WebP is one of the easiest ways to improve page speed. Files are 25-35% smaller, which cuts load time and improves Largest Contentful Paint (LCP) scores. Bandwidth costs drop as well, which matters most on high-traffic sites, and users see no difference in visual quality.
Google's own studies found that WebP provides an average of 30% more compression than JPG on the web.
How WebP Compression Works
WebP uses VP8 encoding for lossy images and WebP Lossless encoding for lossless ones. The lossy mode works much like JPG's DCT compression, with more advanced prediction and entropy coding. The lossless mode takes a different approach based on image fragment substitution.
In practice, WebP can match JPG quality at a smaller file size, or give higher quality at the same file size.
Try It Now
Convert between WebP and JPG in your browser, with no software to install.