Heavy PNGs slow your site down
PNG is lossless, which makes it perfect while you design but heavy when you publish. A product cut-out on a transparent background, a hero illustration, a screenshot in a tutorial or a photo exported as PNG can weigh far more than it needs to on a web page. Every extra kilobyte adds loading time, especially on phones, and slow images hurt page speed scores and the experience of your visitors.
AVIF is a modern format designed for the web. It supports transparency like PNG, and at similar visual quality it usually produces much lighter files. Converting PNG to AVIF is one of the simplest ways to make image-heavy pages faster.
Who uses PNG to AVIF
Online store owners on Shopify, WooCommerce or other platforms with product photos on transparent backgrounds. Web developers preparing assets for a site that serves AVIF with a PNG fallback. Bloggers and documentation writers with lots of screenshots. Designers handing off optimized images to a client's website. In each case the goal is the same: the image should look the same and weigh less.
Current versions of Chrome, Edge, Firefox and Safari display AVIF. Older software and some apps can't, so keep your PNG originals for print and for places outside the browser.
Transparency and quality
Transparent areas stay transparent in the AVIF file, so a logo or product cut-out keeps sitting cleanly on any background color. Because AVIF compresses with some loss, compare the result at full size, especially for graphics with thin lines or small text. If edges look soft, raise the quality a little.
Encoding AVIF is slower than saving PNG, JPG or WEBP. It happens on your device: on a computer it's usually fast, while on a phone each image can take a few seconds. For a large batch, use a computer if you can.
Converted on your device
Nothing is uploaded. Your PNG files are converted in the browser, so unreleased designs and client assets stay private. There's no account, no watermark and no limit on the number of files: select a full folder of images and download every AVIF in one ZIP.
Getting the most out of AVIF
Start with a medium quality and look at the result at full size next to the original PNG. If the image looks the same, try a lower value; if fine edges or small text look soft, go higher. Images that are much bigger than they'll ever be shown on screen waste space in any format, so it often pays to use “Resize image” first and set the width your website actually displays.
On the website itself, many developers serve AVIF inside a picture element with a PNG or WEBP fallback, so older browsers still get an image. Some platforms and plugins handle this for you; check the documentation of yours.