How the conversion works
Modern browsers ship their own AVIF decoder, and this tool borrows it. When the page loads it checks whether your browser can open AVIF at all, and warns you above the drop area if it cannot. Each image you add is decoded by the browser, painted onto a canvas over your chosen fill color, and saved as a JPG at the slider's quality. Pixel size and file name stay the same, so hero.avif becomes hero.jpg.
hero.avif → decode with your browser's AVIF support → fill transparency → save as JPG at quality 92 → hero.jpg
None of this involves a server. The images are converted on your device and are not uploaded or stored.
What AVIF is, briefly
AVIF is an image format built on AV1, a royalty-free video codec from the Alliance for Open Media, a group that includes Google, Apple, Microsoft, Mozilla, Amazon and Netflix. It squeezes images smaller than JPG or WebP at similar quality and supports transparency, HDR and wide color. Browsers adopted it quickly; much of the software people use outside the browser has not.
Browser support for this tool
| Browser | Opens AVIF from |
|---|---|
| Chrome (desktop and Android) | Version 85, 2020 |
| Firefox | Version 93, 2021 |
| Safari (Mac, iPhone, iPad) | Version 16, 2022 |
| Edge | Version 121, 2024 |
If you see the notice saying your browser cannot open AVIF, update the browser or open this page in one of the browsers above. On an iPhone or iPad, Safari's version follows iOS, so iOS 16 or later is needed.
Where JPG gets you further
- Desktop software. Older photo viewers, Word and PowerPoint versions, and many image editors will not open AVIF.
- Upload forms and marketplaces. Most list JPG and PNG as the accepted formats.
- Printing and sharing. Print services, digital frames and the people you send pictures to can all open a JPG.
Worked example: images saved from a news site
You saved three charts from an article and each arrived as AVIF, around 40 KB. You want them in a report. Drop all three here, keep quality 92 and press Convert. The JPGs come out at the same pixel size, and the list shows each new file size; expect them to be noticeably larger than the AVIFs. Press "Download all 3 as ZIP" and insert the JPGs into your document.
Limits
Animated AVIF converts to a single still frame. Metadata such as EXIF and the color profile is not copied, and HDR images are saved as standard 8-bit JPG. Images over about 16.7 megapixels are scaled down to fit the browser's canvas limit, and the list says when that happened. The tool also accepts WebP, PNG, GIF and BMP files and converts them the same way.
Questions people ask
Where do AVIF files come from?
Mostly from websites. Image CDNs and many large sites send AVIF to browsers that support it because it is even smaller than WebP, so saving a picture from a web page can give you a .avif file. Some image editors and phone apps can also export AVIF. iPhones do not take photos in AVIF; their default is HEIC, which has its own converter.
Which browsers can run this converter?
Any browser that can display AVIF: current Chrome, Edge and Firefox, and Safari 16 or later on Mac, iPhone and iPad. The tool uses the browser's own AVIF decoder, so if your browser is too old, the page shows a notice instead of failing silently.
Why can't my computer open AVIF files?
Plenty of desktop software still does not read AVIF, including older photo viewers, office suites and image editors. On Windows, the Photos app relies on Microsoft's AV1 Video Extension from the Microsoft Store to show AVIF. Converting to JPG avoids all of that, because every program reads JPG.
Will the JPG look worse than the AVIF?
At the default quality of 92 it looks the same on screen. The JPG will usually be a larger file, often several times larger, because AVIF compresses far more efficiently. That size is the price of a file that opens everywhere.
What about HDR or transparent AVIF images?
Transparent areas are filled with the color you choose, white by default, because JPG has no transparency. HDR and wide-color AVIFs are saved as a standard 8-bit JPG, so very bright highlights and extra-vivid colors are toned down to what a normal JPG can hold.
Are my images uploaded?
No. Your browser decodes the AVIF and writes the JPG on your device. Nothing is sent anywhere.