AVIF to PNG Converter: Decode AV1 Images in Browser

AVIF is the still-image side of the AV1 video codec, pushed onto the web by Netflix, Google and the Alliance for Open Media to undercut JPEG file sizes. The trouble starts the moment a file leaves a current browser: older Photoshop builds, most Office apps, many CMS upload fields and a lot of print and design tools still reject a .avif outright. PNG is the container those tools have read since the 1990s, which is why most people end up here. Under the hood this runs the @jsquash/avif WebAssembly build, the same libavif and dav1d decode path browsers use natively. It decodes the AVIF to raw RGBA pixels, then re-encodes them with @jsquash/png. PNG uses DEFLATE, which is fully lossless, so the encode step adds no artifacts of its own. When the AVIF carries an alpha channel, that transparency maps straight into PNG's alpha, so cutouts and logos come out clean with no white box. The whole job happens in the tab you already have open. Your file is read into memory, decoded and re-encoded locally; nothing is sent anywhere and nothing survives a tab close. That is the practical difference when the AVIF is a product render, a screenshot, or anything you would rather not push through an upload endpoint. One honest limit: AVIF is normally a lossy format. The PNG holds exactly what the AVIF contained, not the detail the camera or render had before AVIF compressed it. The conversion is lossless; the source usually was not.