How to Convert Images to AVIF (and Why It's Worth It)

Want the same photo at half the file size with no visible quality loss? That's the promise of AVIF, and for websites it translates directly into faster pages and better Core Web Vitals. Here is how to convert to AVIF for free in your browser, and when it's actually worth the switch. And if Core Web Vitals are your end goal, this Core Web Vitals improvement checklist breaks down what LCP, CLS and INP each need.

Convert to AVIF in 3 steps

1. Open the free Image to AVIF converter.
2. Upload a JPG, PNG, or WebP image.
3. Adjust quality if needed, then download the AVIF.

The conversion happens on your device — nothing is uploaded.

Why AVIF is worth it

• Smaller than JPEG. AVIF typically cuts file size by 50% or more versus JPEG at similar quality.
• Smaller than WebP. Compared with WebP — already a big improvement on JPEG — AVIF is usually 20–30% smaller again (this is the heart of the AVIF vs WebP comparison).
• Modern features. It supports transparency and high dynamic range, so it can replace both JPEG and PNG.

For the best web results, convert your final images with the Image to AVIF tool and compare the output size against your originals.

Browser support and fallbacks

AVIF is supported in current versions of Chrome, Edge, Firefox, and Safari, so most visitors will see it. For maximum compatibility, serve AVIF with a fallback using the <picture> element:

<picture>
  <source srcset="photo.avif" type="image/avif">
  <source srcset="photo.webp" type="image/webp">
  <img src="photo.jpg" alt="...">
</picture>

You can generate the WebP fallback with Image to WebP.

Converting back to JPEG

If a tool or platform doesn't accept AVIF, convert it back with AVIF to JPG. To squeeze a JPEG further afterward, run it through the Image Compressor.

Privacy note

The Image to AVIF converter works entirely in your browser, so your photos stay on your device.

Frequently asked questions

Is AVIF better than WebP? For file size, usually yes — though WebP encodes faster and is supported in slightly more places.

Are my images uploaded? No. Conversion happens entirely in your browser.

When AVIF isn't the right choice

AVIF is excellent for delivering finished images, but it's a poor working format. Encoding is slow — noticeably slower than JPEG or WebP, especially at high quality — so it's frustrating for large batches and pointless for images you'll keep editing, since each re-encode costs time and you should never edit a lossy file repeatedly anyway. Avoid it for email attachments and document uploads too: many mail clients and older apps still won't preview AVIF, and the recipient sees a broken thumbnail. It also offers no benefit for tiny UI icons, where the format overhead can make files larger than a hand-tuned PNG or SVG. Use AVIF as the final web-delivery step, keep your editable master in its original format, and provide a WebP or JPEG fallback for reach.