JPG to AVIF Converter

JPEG has been the default image format for photos on the web since the mid-1990s. It's been remarkably resilient. But the compression math behind it hasn't changed, and newer formats have had thirty years to study its weaknesses. AVIF is the result of that study. It's built on the AV1 video codec, which was specifically designed to squeeze more quality out of fewer bytes than any previous approach.

In practice, what that means is this: a JPEG photo at 400KB and an AVIF version of the same photo at 200KB will look essentially identical on screen. Your eyes won't see the difference. But your page load time will feel it. Google's Lighthouse and Core Web Vitals scoring will register it. And if you're paying for bandwidth on a CDN, your bill will reflect it too.

The quality setting that actually matters

Most people converting to AVIF for the first time either go too high on quality and wonder why the file is still large, or go too low and get blocky artifacts they don't expect. The sweet spot for most web images is quality 55 to 65, also this tool's default of 60. At that range, AVIF produces results that look as good as JPEG at quality 80 to 85, but the files are typically 40 to 50% smaller.

If you're converting product photos for an e-commerce store, stay toward quality 65. Shoppers zoom in on product images and any soft edges will cost you trust. For blog images, hero banners, and background photography, quality 55 is genuinely fine. You can push it down to 45 for thumbnail images that display at small sizes and nobody will notice.

Why AVIF is slow to encode, and what this tool already does about it

Here's the honest tradeoff with AVIF. The compression is remarkable but it's computationally expensive to produce. Where a WebP conversion might take under a second in your browser, an AVIF conversion of the same file can take roughly 5 to 30 seconds, depending on the image size and your device's processing power. Older phones and budget laptops feel this more than modern machines.

This tool doesn't use the encoder's slowest, most exhaustive setting. It runs at a speed setting tuned to be roughly 10 times faster than the maximum-compression setting, at a cost of only about 5% larger output. That's a genuinely good trade for almost every real use case, you get nearly all of AVIF's size advantage without waiting minutes per image. It just doesn't make AVIF as fast as JPEG or WebP, which use fundamentally simpler compression math to begin with.

This doesn't matter much if you're converting a handful of images for a website. It does matter if you're trying to batch convert hundreds of product photos in one sitting. For large batch jobs, converting to WebP instead is usually the more practical choice. You still get 25 to 34% file size savings over JPEG with much faster encoding, and browser support is nearly universal at 96% globally.

Serving AVIF safely with a fallback

AVIF browser support crossed 94% globally in 2025 and keeps climbing. But if you're adding AVIF images directly to a website and want to cover the remaining 6%, the HTML <picture> element is your safety net. You offer the AVIF version first, then a JPEG fallback, and the browser picks whatever it supports. The visitor always gets an image. The ones on modern browsers get the smaller, faster AVIF. It's a two-line addition to your HTML and it costs nothing.