Image to AVIF Converter

AVIF is the newest mainstream image format, offering the best compression available today. In plain terms, AVIF makes your images dramatically smaller — often 50% smaller than JPEG — while keeping them looking virtually identical. This format was developed by a consortium that includes Google, Mozilla, Microsoft, Apple, and Netflix, which is why it enjoys broad industry support and rapid browser adoption. If you want the smallest possible image files for your website, AVIF is the answer.

Converting to AVIF with Krunkit is straightforward: drop your images onto the upload area and the tool handles everything automatically. Behind the scenes, Krunkit uses a technology called WebAssembly to run the AVIF encoder directly in your browser. This means your private photos, client deliverables, and confidential materials never leave your computer. The conversion speed depends on image size — a typical 1200x800 web photo converts in 2-4 seconds, while a large 4000x3000 camera photo may take 5-8 seconds.

One thing to be aware of: AVIF takes longer to encode than JPEG or WebP. This is because its advanced compression algorithm does more work to achieve smaller files. Think of it like packing a suitcase very efficiently versus just throwing everything in — the careful approach takes more time but fits more in less space. For a batch of 10 images, expect the full conversion to take 20-60 seconds. The payoff is files that are 40-60% smaller than the same images in JPEG.

After converting, you can use your AVIF images on any modern website. WordPress, Squarespace, Shopify, and most website builders accept AVIF uploads. If you are building a custom site, simply use the AVIF file like any other image — in an HTML img tag or CSS background-image property. For the small percentage of visitors using older browsers, Krunkit lets you also download a JPEG or WebP version as a backup to use with the HTML picture element.