The best web image format depends on what the image needs to do. A product photo, a logo, a screenshot, and a responsive hero image have different requirements for compression, transparency, sharp edges, scaling, and browser support.
Start with the image purpose, not the smallest file extension. Modern formats can reduce transfer size, but the final choice should still preserve the detail that matters to the visitor.
Use this quick decision guide
- Photos: start with WebP or AVIF. Keep a JPEG fallback when you need broader compatibility.
- Screenshots, diagrams, and text-heavy graphics: use PNG when lossless detail is important. WebP or AVIF can also work when tested carefully.
- Logos and interface icons: use SVG whenever the original is a true vector asset. It stays sharp at different display sizes.
- Transparency: use PNG, WebP, or AVIF. JPEG does not support an alpha channel.
- Animation: consider WebP or AVIF, and test the target browsers. Avoid choosing GIF by default when a modern alternative meets the requirement.
Why WebP is a practical default
WebP supports lossy and lossless compression, transparency, and animation. It is a practical delivery format for many photo and graphic workflows. When a CMS or image pipeline makes WebP easy to serve, it is often a sensible first modern format to test.
The goal is not to convert every source asset blindly. Compare the visual result at the size it will actually render. Text in screenshots, thin lines, soft gradients, and transparent edges deserve a closer review.
When AVIF is worth the extra testing
AVIF can provide strong compression and supports transparency, high color depth, and animation. It can be a good candidate for large photographic images where every transferred byte matters. Use <picture> with a fallback when the audience includes browsers or embedded web views that may not support the selected format.
Do not assume that a smaller file is automatically better. Encoding speed, CMS support, image quality, and the available fallback all affect the real production choice.
PNG and JPEG still have clear roles
PNG is lossless and remains useful for crisp screenshots, diagrams, and assets with transparency. JPEG remains a widely compatible, lossy fallback for photographs. Neither format is “obsolete”; they are tools for specific content.
Ship the right dimensions too
Format is only one part of image performance. Export images near the largest displayed size, include width and height attributes, and provide responsive sources when a layout shows meaningfully different image sizes across devices. Avoid sending a large desktop original to a small mobile card.
A repeatable workflow
- Keep the source file in the format that suits editing.
- Resize a delivery copy to the needed display dimensions.
- Create WebP or AVIF candidates and compare them visually.
- Keep a sensible fallback where compatibility requires it.
- Verify the page in a browser and check its actual network payload.
Use the Image Resizer to create correctly sized copies, then use the Image Converter or Image Compressor to prepare delivery files locally.