AVIF to WebP: Complete Conversion Guide for Web & Compatibility

By Bill Crawford  ·  March 2026  ·  8 min read  ·  Last updated March 7, 2026

Connect on LinkedIn →

What Is WebP?

WebP is a modern image format developed by Google and first released in 2010. It supports both lossy and lossless compression, full RGBA transparency, and animation — giving it the core capabilities of JPG, PNG, and GIF combined in a single format. Lossy WebP typically produces files 25–35% smaller than equivalent-quality JPG, while lossless WebP produces files 26% smaller than PNG on average.

WebP's defining advantage is compatibility. As of 2024, WebP is supported by all major browsers including Chrome, Firefox, Safari (since version 14), Edge, Opera, and their mobile counterparts. It is also accepted by the majority of CMS platforms, image CDNs, and web-publishing tools. For web image delivery, WebP is the most broadly compatible modern format available today.

AVIF: The Next-Generation Challenger

AVIF (AV1 Image File Format) is a newer format based on the AV1 video codec's intra-frame encoding. It was standardized by the Alliance for Open Media in 2019 and has seen rapid browser adoption since 2021. AVIF achieves compression efficiency roughly 50% better than JPG and measurably better than WebP at equivalent visual quality.

Despite its technical advantages, AVIF has a key limitation: it requires more processing power to encode and decode, and it is not yet universally accepted across all platforms. Older browser versions, some CMS systems, email clients, and native OS image viewers may not support AVIF. This is the primary reason to convert AVIF to WebP: to gain the broader compatibility that WebP offers.

When Should You Convert AVIF to WebP?

The most common scenarios for AVIF-to-WebP conversion are:

• Legacy browser support. If your audience includes users on older Chrome, Firefox, or Samsung Internet versions that support WebP but not AVIF, converting ensures those users see correctly rendered images.
• CMS platform requirements. Many CMS platforms — including older versions of WordPress, Squarespace, and Shopify — accept WebP uploads but reject or ignore AVIF files. Converting to WebP ensures compatibility with those platforms' media pipelines.
• Email newsletter images. Most email clients do not support AVIF. Converting to WebP (or JPG) is necessary for images that will appear inline in HTML email.
• Third-party integrations. Social media platforms, DAM systems, and advertising networks each have their own format support lists. WebP is more widely accepted than AVIF across these integrations.
• Standardizing a mixed asset library. If your workflow produces AVIF files from some tools and WebP from others, converting to a single format (WebP) simplifies delivery logic and reduces <picture> tag complexity.

AVIF vs WebP: Detailed Comparison

Understanding WebP Quality Settings

WebP quality is specified on a 0–100 scale. Unlike some formats where quality 100 means truly lossless, WebP quality 100 still uses the lossy compression pipeline but minimizes artifacts to near-invisible levels. For true lossless output, WebP offers a separate lossless encoding mode (not exposed in this tool's quality slider, which uses the standard lossy pipeline).

Guidelines for choosing a quality value:

• Quality 90–100: Near-transparent quality difference from the source. File sizes are larger but artifacts are invisible to the human eye. Use for photography, product images, or any image where sharpness is critical.
• Quality 80–89: Excellent quality. Slight file size reduction with no perceptible loss for most images. This is the recommended range for general web delivery. The default setting of 90 falls at the top of this band.
• Quality 70–79: Good quality with meaningful size reduction. Suitable for background images, thumbnails, or situations where loading speed is more important than pixel-perfect rendering.
• Quality 50–69: Visible but acceptable quality loss. Best for very large images where bandwidth is severely constrained, or for thumbnails that will be displayed at a fraction of the source resolution.
• Quality below 50: Noticeable artifacts. Generally only appropriate for very small thumbnails or situations where file size is the dominant constraint.

When converting from AVIF (itself a lossy format) to WebP, you are introducing a second generation of lossy compression. The quality of the output is bounded by both the source AVIF quality and the WebP quality setting. To minimize generation loss, always start from the highest-quality AVIF available and use a WebP quality of 90 or higher.

WebP and Transparency

One of WebP's most important capabilities is full alpha channel support. WebP can encode RGBA images with per-pixel transparency, making it a direct replacement for PNG in web contexts where transparency is required. Converting an AVIF file that contains transparent areas to WebP will preserve that transparency in the output — no need to add a white or colored background.

This is particularly relevant for product images on white backgrounds, logos, icons, and UI elements. A WebP with transparency will be smaller than an equivalent PNG while maintaining the same transparency behavior in browsers.

Serving Both AVIF and WebP

If you have control over your web server or CDN configuration, the best-practice approach is to serve both formats using the HTML <picture> element, letting the browser choose the best format it supports:

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

In this pattern, a browser that supports AVIF will use the AVIF source for the best compression. A browser that supports WebP but not AVIF will use the WebP source. Older browsers fall back to the JPG. The AVIF-to-WebP converter on this site produces the WebP layer of this stack.

Conversion Methods

Browser-Based (No Installation)

The AVIF to WebP Converter on this site handles everything client-side. Drop your AVIF files, set the quality slider, click convert, and download WebP files. Batch conversion with ZIP download is supported. No account, no upload, no file size limits — processing happens entirely in your browser using the native AVIF decoder and the Canvas API's WebP encoder.

ImageMagick (Command Line)

For batch conversion on macOS or Linux with ImageMagick 7+ installed:

magick input.avif -quality 90 output.webp

For batch conversion of an entire directory:

for f in *.avif; do magick "$f" -quality 90 "${f%.avif}.webp"; done

cwebp (Google's Official Encoder)

Google's cwebp tool is the reference WebP encoder. Convert from AVIF by first converting to PNG with ImageMagick, then encoding with cwebp:

magick input.avif input.png && cwebp -q 90 input.png -o output.webp

Squoosh (Google's Browser Tool)

Google's Squoosh app (squoosh.app) supports AVIF input and WebP output with fine-grained quality and encoder controls. It processes files client-side like the tool on this site, but handles one file at a time without batch mode.

Tips & Best Practices

• Start from the highest-quality source. If you have both a lossless source (PNG, TIFF) and an AVIF, use the lossless source as the input for WebP encoding rather than re-encoding from AVIF. Each lossy-to-lossy conversion step adds compression artifacts.
• Use quality 90 as your baseline. This is the sweet spot for most photographic web content. Adjust down if file size is a constraint, or up if you notice artifacts in the output.
• Test at your target display size. An image that looks great at 2x (Retina) may show artifacts more prominently at 1x. Always verify at the actual rendered size on your target platform.
• Use the <picture> element when possible. Rather than choosing between AVIF and WebP, serve both and let the browser pick. This maximizes compression for modern users while ensuring compatibility for older clients.
• Check your CDN's format negotiation. Many modern CDNs (Cloudflare, Fastly, Imgix) can transcode images automatically based on the browser's Accept header. If your CDN supports this, you may not need to pre-convert at all — the CDN will serve AVIF or WebP dynamically.

Frequently Asked Questions

Is WebP better than AVIF?

AVIF achieves better compression — roughly 20–30% smaller files than WebP at equivalent visual quality. But WebP has broader browser and platform support. For modern browsers targeting maximum compression, keep AVIF. For broad compatibility across all platforms and user environments, WebP is the right choice.

Does WebP support transparency?

Yes — WebP supports full per-pixel RGBA transparency. Any transparent areas in your AVIF source will be preserved in the WebP output. This makes WebP a viable replacement for PNG in web contexts where transparency is required, at significantly smaller file sizes.

What quality should I use when converting AVIF to WebP?

Quality 90 is the default and recommended starting point. It produces minimal artifacts at a meaningful reduction in file size compared to quality 100. Adjust down to 80 if you need smaller files and the content is not highly detailed. For thumbnails or background images, quality 70–80 is acceptable.

Does converting AVIF to WebP degrade quality?

Yes, to a small degree. Both AVIF and WebP are lossy formats. Converting AVIF to WebP applies a second round of lossy compression to image data that was already compressed once. At quality 90 or higher, the degradation is typically invisible, but using the highest-quality AVIF source available minimizes generation loss.

Related Tools