You keep seeing .avif files show up, maybe after saving an image from a website, and you're wondering what this format actually is and whether you should be using it. Or you've got an AVIF file that won't open in your usual software. Either way, it helps to understand what AVIF is, where it shines, and where it still trips people up.
What is AVIF?
AVIF (AV1 Image File Format) is a modern image format built on the AV1 video codec. It's an open, royalty-free standard backed by a group of major tech companies. The headline feature is compression: AVIF can produce noticeably smaller files than JPG and even WebP at similar visual quality.
On top of that, AVIF supports several features that older formats handle poorly or not at all:
- High efficiency compression, so images look good at small file sizes.
- Transparency (alpha channel), like PNG and WebP.
- Wide color and HDR, useful for vivid, high-dynamic-range images.
- Both lossy and lossless modes.
AVIF vs WebP vs JPG
It helps to think of these three formats as a timeline of image compression.
- JPG is the oldest of the three and the most universally supported. Every device, browser, and app reads it. The trade-off is efficiency: at smaller sizes, JPG shows blocky artifacts, and it can't do transparency.
- WebP improved on JPG with better compression and added transparency and animation. It's now widely supported across modern browsers and has become a common web format.
- AVIF generally compresses even better than WebP, especially for detailed or high-resolution images, and it handles color and HDR more capably. The cost is that it's the newest of the three, so support and tooling are still catching up.
As a rough rule: JPG wins on universal compatibility, WebP is the safe modern web choice, and AVIF pushes file size lowest while demanding the most up-to-date software to view and edit.
Browser support and the compatibility catch
Most current versions of major browsers can display AVIF images, which is why websites increasingly serve them. That's the good news for viewing on the web.
The catch is everything outside the browser. Many desktop image editors, design tools, presentation programs, and older operating systems still can't open AVIF, or need extra plugins. If you download an AVIF and try to drop it into an editor or upload it to a site that predates the format, you'll likely hit a wall. That's the single most common reason people need to convert AVIF to something else like JPG or PNG.
When should you use AVIF?
Use AVIF when:
- You control a website and want the smallest possible images for fast page loads, with a fallback for older browsers.
- You need good quality at very small file sizes and your audience uses modern browsers.
Convert away from AVIF (to JPG or PNG) when:
- You need to edit the image in software that doesn't support AVIF.
- You're uploading to a site or app that only accepts JPG or PNG.
- You're sharing with someone whose device or software can't read AVIF.
How to convert to and from AVIF with Toolmingo
Toolmingo's Image Converter handles AVIF in both directions, for free and entirely in your browser. There's no upload to a server, no account, and no watermark. Here's how:
- Open the Image Converter tool on Toolmingo.
- Drag in your file. To open a stubborn AVIF, add the
.aviffile; to create one, add a JPG or PNG. - Choose your output format: pick JPG or PNG to make an AVIF usable everywhere, or pick AVIF to shrink an existing image.
- Click convert. The processing runs locally in your browser, so it's fast and your images stay private.
- Download the result and use it wherever you need.
Since the conversion happens on your own device, even unpublished or sensitive images never leave your computer.
Squeezing files even smaller
If your goal with AVIF is small files for the web, you can pair conversion with Compress Image to fine-tune the size of any format. Compressing before or after conversion gives you control over the balance between quality and file size, which is exactly the kind of optimization AVIF was designed for.
FAQ
Is AVIF better than JPG? For file size at a given quality, generally yes, AVIF compresses more efficiently and supports transparency and HDR, which JPG can't. But JPG opens absolutely everywhere, so it's still the better pick when broad compatibility matters more than file size.
Why won't my AVIF file open? Many editors, apps, and older systems don't support AVIF yet, even though most modern browsers do. Converting the AVIF to JPG or PNG gives you a file that works in virtually any software.
Does converting to or from AVIF upload my image anywhere? No. Toolmingo's Image Converter runs in your browser, so your image is processed locally and never sent to a server. It's safe for private and confidential files.