JPG to AVIF

How to use the JPG to AVIF

1. 1Press Select files, or drop your JPG photos onto the page.
2. 2Leave the quality at 60% for web use, or raise it for photos you want to keep sharp.
3. 3Wait while each photo is converted. The row shows the new size.
4. 4Download a single AVIF with its button, or press Download all to get a ZIP.
5. 5Check the results in your browser before you replace the originals.

Why switch photos from JPG to AVIF

JPG was designed in the early 1990s. AVIF uses the video technology behind the AV1 codec and describes the same picture with far fewer bytes. A 3 MB phone photo often becomes around 1 MB, and a page full of photos loads noticeably faster on a mobile connection.

Smaller pictures also help search results, because speed is part of how pages are judged. For a photo library, the same idea means more pictures in the same storage.

Choosing a quality

The slider runs from 20 to 100. For photos on a website, 50 to 65 is the sweet spot. For pictures you will edit again or print, go higher, near 80. Very low values make flat areas look painted.

• 50–65%: website photos and blog posts
• 70–85%: portfolios and product photos
• 90–100%: archive copies, files get larger

Before you replace your originals

Keep the JPG files. AVIF is a delivery format: it is excellent for showing a picture but less widely supported by older software for editing. If you edit again, start from the JPG, not from the AVIF, because every lossy save removes a little more detail.

Phone and computer

On a phone, pick photos from your gallery and download the results to your files. A large photo can take a few seconds because the encoder does real work. On a computer you can drop a whole folder, and it works through the pictures one at a time so the page stays responsive.

A quick example

Take a 4,000 by 3,000 pixel holiday photo of 3.4 MB. At 60 percent quality its AVIF is often between 900 KB and 1.6 MB, depending on how much fine detail is in the scene. Photos of faces, sky and water shrink the most, and photos of leaves, gravel and fabric the least.

The preview and file size appear on the row as soon as the photo is done, so you can try 50, 60 and 70 percent on one picture and pick the lowest setting that still looks right to you.

Good to know

AVIF encoding is slower than JPG saving, which is normal: it spends effort to make the file smaller. The first conversion also loads the encoder, about 3.5 MB, which the browser keeps for later. Pictures with transparency are not a concern for JPG sources, but the tool also handles them if your file turns out to be another type. AVIF is small, but not every old app opens it. Convert transparent images with PNG to AVIF, use PNG to WebP for wider support, and shrink the original first with Compress Image if you need to.

Features

• Real AVIF encoding, not a renamed file
• Convert many photos at once
• Quality slider from 20% to 100%
• Shows how much smaller each file got
• Download one by one or as a ZIP
• Private: nothing leaves your device

Frequently asked questions