Convert PNG to AVIF Online Free — Smaller Images, Faster Pages
PNG files are great for quality, but they come with a weight problem. If your images are slowing down your website, an AVIF conversion is one of the fastest fixes available today. Transfonic lets you convert PNG to AVIF directly in your browser — free, with no account required and no software to install.
You get a next-generation image format that loads faster and takes up significantly less space, without giving up any of that visual quality you need.
How to Convert PNG to AVIF
The conversion takes three steps and takes under a minute from start to finish. Upload your PNG file by clicking the upload button or dragging it onto the tool. Once it's uploaded, the tool gets to work automatically — no settings to fiddle with, no quality sliders to calibrate unless you want to. Then download your converted AVIF file directly to your device.
In a real test using a 1.2MB PNG photograph, Transfonic produced an AVIF output of 580KB — a 52% reduction in file size with no visible quality loss on a 1920×1080 display. For web use, that kind of reduction means faster load times, better Core Web Vitals scores, and less bandwidth burned on every page visit.
Why AVIF Is Worth Switching To
AVIF stands for AV1 Image File Format and it's built on the AV1 codec — the same compression technology behind next-gen video streaming. Compared to PNG, AVIF files are dramatically smaller. Compared to WebP, AVIF typically compresses even further while maintaining the same level of detail.
Here's what makes it useful in practice:
Smaller files — typically 40–60% smaller than PNG at equivalent quality
Full transparency support — AVIF handles alpha channels, so transparent PNGs convert cleanly
Wide color gamut — supports HDR and WCG for richer, more vibrant images
Browser support — Chrome, Firefox, Safari, and Edge all support AVIF natively
No quality loss — lossless AVIF conversion preserves every pixel of your original
One honest note: AVIF is not yet supported by some older browsers or by certain image editing software that hasn't updated its format library. If you need maximum compatibility across legacy environments, PNG to WebP is a solid middle-ground format worth considering.
Who Should Convert PNG to AVIF?
Web developers and front-end engineers use PNG to AVIF conversion when optimizing site performance. Swapping out heavy PNG assets for AVIF files is a proven way to improve Google PageSpeed scores and reduce page weight, especially on image-heavy landing pages and portfolios.
E-commerce store owners benefit too. Images never land anywhere else, while product photography always has to find its way into PNG, but because you get a much bigger file, those files tend to bloat category pages and slow down the product galleries. Go AVIF — converts the fat, but you cannot tell in a picture.
This is a common swap made by bloggers, content makers and WordPress users after seeing their site flunk Core Web Vitals audits. It is a one-time gain per image that carries on paying dividends with each individual visitor filling up the page later.
If you're working with multiple image formats and need a broader conversion toolkit, Transfonic's image conversion hub covers dozens of format pairs in one place.
Free, Private and Ready Right Now
There's nothing to sign up for and nothing to pay. Every PNG you upload is processed over a 256-bit SSL-encrypted connection and permanently deleted from the server the moment your AVIF file is ready to download. Transfonic never stores, shares, or analyzes your images.
For other PNG format conversions, PNG to JPG is also available on Transfonic — same free, no-account workflow.