Which browsers can create AVIF?

All current ones. Browsers can't encode AVIF natively, so this page uses a WebAssembly encoder that works the same in Chrome, Edge, Firefox and Safari. It is fetched from this site the first time you use it, so the very first AVIF needs a connection; after that it works offline.

Are my images uploaded anywhere?

No. The conversion runs entirely in your browser using the canvas API and, for some formats, WebAssembly — the image never leaves your device. Most conversions keep working with the internet switched off once the page has loaded. A few (HEIC, TIFF, AVIF and PNG to SVG) download a helper file from this site the first time you use them; if you are offline at that moment you are told so, not blamed for a broken file. There is no upload endpoint to send anything to.

Yes — no account, no watermark, no daily limit, and no paid step at download. It's free because there's no server doing the work, so it costs us almost nothing to run.

Convert a PNG to AVIF for the smallest file

AVIF produces the smallest files of any widely-used web image format — often dramatically smaller than PNG for the same picture, while still supporting transparency. If you're squeezing every kilobyte out of a site, AVIF is the current state of the art.

Browsers can open AVIF but none can create it from a canvas, so this page carries its own AVIF encoder (libavif compiled to WebAssembly). It is downloaded from this site the first time you convert to AVIF, runs in the background on your device, and works in any current browser — larger pictures simply take a few seconds.

What this does — and what it doesn't

AVIF encoding is slow compared with JPG or WebP, especially for large pictures. The page shows progress and keeps working while it encodes.
Older software may not open AVIF yet. Use WebP or PNG when broad compatibility matters more than the smallest size.

Related conversions

Keep going

PNG to AVIF — frequently asked questions

Which browsers can create AVIF?: All current ones. Browsers can't encode AVIF natively, so this page uses a WebAssembly encoder that works the same in Chrome, Edge, Firefox and Safari. It is fetched from this site the first time you use it, so the very first AVIF needs a connection; after that it works offline.
Are my images uploaded anywhere?: No. The conversion runs entirely in your browser using the canvas API and, for some formats, WebAssembly — the image never leaves your device. Most conversions keep working with the internet switched off once the page has loaded. A few (HEIC, TIFF, AVIF and PNG to SVG) download a helper file from this site the first time you use them; if you are offline at that moment you are told so, not blamed for a broken file. There is no upload endpoint to send anything to.
Is it really free?: Yes — no account, no watermark, no daily limit, and no paid step at download. It's free because there's no server doing the work, so it costs us almost nothing to run.

All image converters

Photos & everyday images

Web formats

Vector & SVG

Icons

Spotted a bug or have a suggestion?

Found something broken, have an idea, or just want to say thanks about any of our tools? Every message reaches a real person.