Convert WebP to AVIF Online
Convert WebP images to next-generation AVIF format, free, in your browser.
.webp, .png, .jpg · up to 50 MB
Use cases
WebP to AVIF: next-gen image format for the modern web
20% smaller files
AVIF produces files 20% smaller than WebP at the same visual quality. Less weight, same quality.
Core Web Vitals
Lighter images improve LCP (Largest Contentful Paint), the most important speed metric for SEO.
100% private
Your image is converted in your browser. Never uploaded to any server.
Transparency preserved
WebP alpha channel is preserved in AVIF. Perfect for logos, icons, and UI elements.
How it works
Three steps, no hassle
Upload your WebP image
Drag or select your .webp file. Up to 50 MB, no sign-up. Supports both static WebP and WebP with transparency.
Conversion to AVIF
Your image converts to AVIF directly in your browser using the Canvas API and native AVIF codec. Nothing is uploaded to any server.
Download your AVIF
Compare file size before and after. AVIF is typically 20% smaller than WebP at the same perceived visual quality.
FAQ
Got questions?
AVIF (AV1 Image File Format) is an image format derived from the AV1 video codec, developed by the Alliance for Open Media (AOMedia) and published as a specification in February 2019. AOMedia was founded in 2015 by Amazon, Apple, ARM, Cisco, Google, Intel, Microsoft, Mozilla, Netflix, and Nvidia, among others, with the goal of creating royalty-free video and image codecs. AVIF uses the AV1 codec for still image compression, giving it significantly superior compression efficiency to WebP for many content types: photographic images, illustrations, and screenshots. In comparative benchmarks, AVIF produces files approximately 20% smaller than WebP at the same subjective visual quality (SSIM/DSSIM), and 50–60% smaller than JPG. AVIF also supports transparency (alpha channel), HDR (high dynamic range), 10- and 12-bit color depth images, and animated sequences.
AVIF has native support in all major modern browsers: Chrome 85 (August 2020) was the first to add full support for static AVIF images; Firefox 93 (October 2021) added AVIF support without flags; Opera 71 (August 2020, based on Chromium 85) inherited Chrome's support. Safari 16 (September 2022, available on iOS 16 and macOS Ventura) was the last major browser to add AVIF support. Edge 121 (January 2024) added animated AVIF support. For users on browsers without AVIF support (Safari 15 and earlier, older Edge, IE), the recommended pattern is to use the HTML <picture> element with a <source type='image/avif'> and a fallback <img> in WebP or JPG.
Core Web Vitals, the set of user experience metrics that Google has used as a ranking signal since May 2021, includes LCP (Largest Contentful Paint) as one of its three main indicators. LCP measures the time for the largest visible content element — frequently a hero image — to finish rendering. Smaller images download faster, reducing LCP. If your page's LCP is a 200 KB WebP image that weighs 160 KB in AVIF, the 20% size reduction directly translates to faster download times, especially on slow mobile connections (3G, weak 4G). Google PageSpeed Insights and Lighthouse already evaluate the use of next-gen formats as a positive signal in their 'Serve images in next-gen formats' audit.
WebP was developed by Google and announced in September 2010 as a more efficient alternative to JPG and PNG. At launch, WebP offered a 25–34% reduction over JPG at equivalent quality. However, WebP uses the same base compression technology as the VP8 video codec (2010), which has been surpassed by the advances in information theory and video coding of the last decade. AVIF uses AV1 (2018), a significantly more modern codec with better modeling of visual content. For image pipelines on CDNs (Cloudflare Images, Fastly, Imgix, Cloudinary), converting master images to AVIF maximizes delivery efficiency to modern browsers. Bandwidth savings on sites with millions of page views are substantial.
Yes. Both WebP and AVIF support alpha channels (transparency). If your WebP has transparent areas (WebP with alpha channel, commonly generated from PNG or rasterized SVG graphics), the transparency is preserved in the resulting AVIF. Unlike WebP→JPG conversion (where transparency is lost and filled with white), WebP→AVIF maintains transparency fully. This makes AVIF especially valuable for logos, icons, product images with transparent backgrounds, and UI elements that need to overlay variable backgrounds.
In-browser conversion uses the HTML5 Canvas API (canvas.toBlob() or canvas.toDataURL() with type 'image/avif') and the browser's own rendering engine for AVIF encoding. This has several implications: AVIF encoding quality depends on the browser's encoder (Chrome/Chromium uses libaom, AV1's reference implementation, which prioritizes compatibility over speed); the process can be slower than converting JPG to JPG because AVIF is computationally more complex; animated WebP images are converted to only their first frame (animated AVIF requires full sequence encoding not available via Canvas API). For batch conversions or requirements of maximum speed and optimization, command-line tools like avifenc (from AOMedia's libavif library) or squoosh-cli offer greater control over encoder parameters.
Convert WebP to AVIF: the next-generation image format for the modern web
WebP was developed by Google and publicly announced in September 2010, based on the VP8 video codec technology that Google had acquired through the purchase of On2 Technologies in February 2010. WebP was designed to replace JPG and PNG with a single format capable of handling both lossy photographic images and lossless images with transparency, occupying 25–34% less than JPG at equivalent quality. WebP adoption was slow in its early years: Internet Explorer and Safari resisted its adoption for nearly a decade, with Safari not adding native support until Safari 14 (September 2020). Chrome has supported WebP since version 23 (November 2012), Firefox since version 65 (January 2019). Today, WebP is the format modern browsers use by default when saving images from web pages. However, WebP is based on compression technology from 2010, and in the thirteen years since its creation, image coding research has advanced considerably.
AVIF (AV1 Image File Format) represents the state of the art in web image compression. Based on the AV1 video codec, developed by the Alliance for Open Media (AOMedia) — a consortium founded in 2015 by Amazon, Apple, ARM, Cisco, Google, Intel, Microsoft, Mozilla, Netflix, Nvidia, and Samsung, among others — AVIF inherits decades of advances in video compression. The AV1 Image File Format specification was published in February 2019. Chrome 85 (August 2020) was the first major browser to add full AVIF support; Firefox 93 (October 2021) followed; Safari 16 (September 2022, iOS 16 and macOS Ventura) completed adoption across the three major browser engines. In terms of compression efficiency, AVIF produces images approximately 20% smaller than WebP at the same subjective visual quality, as measured by metrics like SSIM, DSSIM, or VMAF. For photographic images under specific conditions (skin tones, natural textures, smooth gradients), the difference can be even larger. AVIF also supports alpha channels (transparency), high bit-depth images (10 and 12 bits per channel), HDR color space, and animations.
For web development teams and site owners, migrating from WebP to AVIF has a direct, measurable impact on performance. Google Core Web Vitals, adopted as a ranking signal in May 2021, include LCP (Largest Contentful Paint) as one of their three main indicators: it measures the time until the largest visible content element on screen — frequently a hero image, a banner, or a product image — has finished rendering. AVIF images that are 20% smaller download faster, especially on mobile connections with limited bandwidth. In a modern CDN pipeline (Cloudflare Images, Fastly Image Optimizer, Imgix, Cloudinary, Amazon CloudFront with Lambda@Edge functions), converting master images to AVIF and serving them with content negotiation (Accept: image/avif) to compatible browsers maximizes delivery efficiency. For e-commerce sites with thousands of product images, editorial catalogs with high-resolution photography, or media platforms with millions of daily views, CDN bandwidth savings from migrating WebP to AVIF are economically significant. Convertir.ai lets you validate WebP→AVIF conversion quality and file size directly in the browser, with no command-line tool dependencies.