WebP vs AVIF: Which Modern Image Format Should You Use?

The Short Version

If you need broad compatibility right now and fast encoding, use WebP. If you want the best possible compression and can accept slower encoding and slightly narrower browser support, use AVIF. For maximum reach, serve AVIF with a WebP fallback and JPEG as a last resort.

Background: Why New Formats Exist

JPEG was standardized in 1992. PNG arrived in 1996. Both remain the most widely used image formats on the web, but they were designed for a different era. JPEG's compression creates visible artifacts at lower quality settings, and PNG files are often unnecessarily large for photographic content.

WebP was developed by Google and released in 2010. AVIF, based on the AV1 video codec, was finalized as a still image format in 2019. Both aim to replace JPEG and PNG with better compression and more features.

Compression Efficiency

This is where the most meaningful differences appear. Both formats outperform JPEG, but AVIF consistently achieves better compression ratios.

In real-world testing across photographic images, AVIF typically produces files that are 20% smaller than WebP at equivalent visual quality, and roughly 50% smaller than JPEG. WebP itself is usually 25-35% smaller than JPEG at comparable quality.

For example, a 500 KB JPEG photograph might compress to approximately 325 KB as WebP and 260 KB as AVIF, with no perceptible quality difference to the human eye. Across an entire website with hundreds of images, that gap adds up to meaningful bandwidth savings and faster page loads.

Image Quality

Both formats handle photographic content well, but they have different strengths:

• AVIF excels at low bitrates. When you need to compress an image aggressively, AVIF maintains perceptual quality better than WebP. It handles smooth gradients, skin tones, and subtle color variations particularly well, avoiding the blockiness that can appear in highly compressed WebP or JPEG images.
• WebP handles sharp edges and text better. For images with crisp lines, text overlays, or sharp geometric shapes, WebP can sometimes produce cleaner results than AVIF at the same file size. AVIF's AV1-based compression can occasionally smooth out very fine detail.
• Both support transparency. Unlike JPEG, both WebP and AVIF support alpha channels for transparent backgrounds. However, WebP lossy with alpha can produce artifacts around transparency edges, while AVIF handles this more cleanly.
• AVIF supports wider color gamuts. AVIF natively supports 10-bit and 12-bit color depth and HDR content. WebP is limited to 8-bit color. For HDR displays and wide-gamut photography, AVIF is the clear choice.

Browser Support

Browser support is where WebP has a significant practical advantage:

WebP's support is now nearly universal. AVIF has caught up considerably since Safari added support in 2023, but there remains a gap in older browser versions still in active use.

Encoding Speed

This is AVIF's biggest practical weakness. AVIF encoding is significantly slower than WebP encoding, often by a factor of 10x or more. A batch of images that takes 5 seconds to convert to WebP might take over a minute to encode as AVIF.

For static sites where images are encoded once during a build step, this is acceptable. For dynamic applications that need to convert images on the fly or user-facing tools where people are waiting, encoding speed matters. WebP provides a much faster conversion experience.

Decoding speed (displaying the image in a browser) is comparable between the two formats, so end users will not notice a difference when viewing pages.

Animation Support

Both formats support animation as an alternative to GIF. WebP animations are widely supported since they share browser support with static WebP. AVIF animations (AVIF sequences) offer better compression but have more limited tool and browser support.

If you are converting animated GIFs, WebP is currently the more practical choice for broad compatibility.

Practical Recommendations

For Web Developers

Use the HTML <picture> element to serve AVIF first, WebP second, and JPEG/PNG as a fallback:

<picture>
  <source srcset="image.avif" type="image/avif">
  <source srcset="image.webp" type="image/webp">
  <img src="image.jpg" alt="Description">
</picture>

This gives every visitor the best format their browser supports. Most modern CDNs and image optimization services can also handle format negotiation automatically via the Accept header.

For Social Media and General Sharing

Stick with JPEG or PNG for maximum compatibility. Most social media platforms will re-encode your images anyway. If you have WebP or AVIF files that you need to share, convert them to a universal format first.

For Photographers and Designers

If color accuracy and HDR support matter, AVIF is the better archival and delivery format. Its 10-bit and 12-bit color depth preserve nuances that 8-bit WebP and JPEG cannot represent. For day-to-day work where files need to be shared across tools and platforms, PNG remains the safest lossless choice and JPEG the safest lossy one.

Side-by-Side Summary

The Bottom Line

WebP and AVIF are not competitors so much as they are steps on the same evolutionary path. WebP replaced JPEG and PNG for most web use cases. AVIF will likely do the same to WebP over the next few years as encoding tools improve and browser support reaches parity.

Today, the pragmatic choice for most projects is WebP as the primary format with AVIF as a progressive enhancement. Serve both using the <picture> element or content negotiation, and let each browser use the best format it supports. Keep JPEG and PNG as fallbacks and as your interchange formats when sharing files outside the web.

Need to convert between image formats? Try our free browser-based tools: WebP to PNG, WebP to JPG, PNG to WebP, SVG to WebP, and more. All processing happens locally in your browser.