WebP vs AVIF: Which Image Format Is Better for Websites?
Compare WebP and AVIF for compression, transparency, HDR, compatibility and real-world website image delivery.
ReFormatic ·
WebP and AVIF are both modern image formats designed to reduce image delivery costs compared with many older formats. However, newer does not automatically mean better for every image and every website.
Quick answer
AVIF can provide very efficient compression and supports modern features such as HDR, while WebP has a mature deployment history and remains a practical option for many websites. Compare actual output quality at the same display size and verify your browser and processing pipeline instead of choosing a format based only on its name.
What is WebP?
WebP supports lossy and lossless compression, transparency and animation. MDN describes it as a strong choice for both still and animated web images.
That makes WebP a common replacement for JPG and PNG in image delivery pipelines.
What is AVIF?
AVIF is an image format based on AV1 compression technology. It can support lossy and lossless encoding, transparency and HDR.
For some images and encoder settings, AVIF can produce very small files at high perceived visual quality. Encoding speed, software workflow and target-environment support still matter.
Is AVIF always smaller than WebP?
No. Results vary with image content, encoder, quality level, chroma settings, resolution, alpha transparency and HDR requirements.
The most reliable test is to encode the same source into both formats and inspect the real output at the size users will actually see.
Should every website image be converted to AVIF?
Not necessarily. Websites can provide several image formats. HTML <picture> allows multiple sources so a browser can select a supported option.
A practical workflow is to retain a high-quality source, generate AVIF/WebP delivery versions and keep a legacy fallback only where necessary.
What can ReFormatic do?
The ReFormatic image tool can convert supported image formats and adjust image dimensions before export. Relevant routes include:
This makes it easy to generate multiple test outputs from one source image and compare file size and visible quality.
Frequently asked questions
Does WebP support transparent backgrounds?
Yes. WebP supports transparency.
Does AVIF support HDR?
Yes, AVIF can represent HDR content when the surrounding workflow and display support it.
Does converting JPG to WebP make the image sharper?
No. Format conversion cannot create detail that does not exist in the source. The goal is usually more efficient encoding and delivery.
What should I keep as the master image?
For important assets, keep a high-quality source instead of treating a compressed web-delivery file as your only original.
Conclusion
WebP is a practical modern web format, while AVIF can provide excellent compression and richer capabilities such as HDR. Test your own images, quality targets and browser audience rather than assuming one format always wins.