An AVIF is one AV1 video frame in a labelled box.
Your browser has an AV1 video encoder built in. This page feeds it your JPG as a single key frame, then writes the AVIF container around that frame box by box: type, item list, size, codec settings, data. The finished file is decoded again and compared with the JPG, so every number here is measured.
The same picture written at six AV1 quantizers, plus a JPG re-save at quality 85 for scale. Each row is a real file: bytes, quality against your JPG, and how long your device took to encode it. How much AVIF saves depends on the encoder: browsers ship AV1 encoders tuned for live video, while dedicated still-image encoders work harder per pixel.
At the same quality as a JPG re-save (40.0 dB), AV1 q46 is 345 KB: 1% larger than the JPG, and 1.5× faster to encode. This browser’s AV1 encoder is built for real-time video, so it trades size for speed; a still-image encoder such as libavif (avifenc) spends longer and usually beats JPG. Click a row to use it.
The browser takes the first source it can show, so order is everything. The WebP below was encoded here too, at quality 80, so all three sizes in the comments are real. This browser:
<picture> <source srcset="lake.avif" type="image/avif"> <!-- 447 KB --> <source srcset="lake.webp" type="image/webp"> <!-- 200 KB --> <img src="lake.jpg" width="1600" height="1066" alt="" loading="lazy"> <!-- 392 KB --></picture>
Yes, JPG to AVIF conversion is completely free with no signup, no watermark, and no usage limit. Convert as many files as you need.
No. The JPG to AVIF converter runs in your browser when your file is supported there, so the file stays on your device for that workflow, reducing server exposure for that workflow. If the file is sensitive, check the processing mode first.
Most JPG to AVIF conversions finish in under a minute. Bigger files take longer, in proportion to their size. There is no queue to join and no account to make first.
Depends on what you are converting between. Go lossless to lossless and the picture or the audio comes out untouched. Go to a lossy format and you give up a little to get a smaller file.
Yes. The JPG to AVIF converter works on phones, tablets, and desktops in any modern browser including Chrome, Safari, Firefox, and Edge.