Format Overview
JPEG has been the dominant image format on the web for over 25 years. WebP, introduced by Google in 2010, was designed as a modern replacement offering better compression.
Today, both formats have their place in a web developer's toolkit.
File Size Comparison
In our testing across thousands of images, WebP consistently produces smaller files:
- Photographs: WebP is 25-34% smaller than JPEG at equivalent quality
- Graphics with text: WebP is 20-30% smaller
- Mixed content: WebP averages 28% smaller
These savings translate directly to faster page load times and reduced bandwidth costs.
Quality Analysis
At comparable file sizes, WebP and JPEG produce similar visual quality. However, WebP handles certain content types better:
WebP excels at: Sharp edges, text overlays, gradients, and images with transparency.
JPEG excels at: Very high-quality photography where maximum detail preservation is needed.
Browser Support in 2025
WebP now enjoys universal browser support. All major browsers including Chrome, Firefox, Safari, and Edge fully support WebP. Global support exceeds 97%.
The only remaining gaps are very old browser versions that represent less than 1% of web traffic.
When to Use Each Format
Use WebP when:
- Building modern websites where performance matters
- You need transparency support (alternative to PNG)
- Serving images at scale where bandwidth savings add up
- Using a CDN that supports automatic format negotiation
Use JPEG when:
- Maximum compatibility is required (email attachments, legacy systems)
- Working with professional photography workflows
- The receiving system doesn't support WebP
Migration Strategy
The best approach is to serve WebP with a JPEG fallback using the HTML picture element or content negotiation via Accept headers. This ensures all users get the best experience their browser supports.