AVIF to JPG Converter

This tool converts AVIF images to JPG (also written JPEG) inside your browser. It is for anyone who saved an .avif picture from a website and needs a file that every phone, computer, email client and upload form accepts — without handing the image to an online converter's server.

AVIF, the AV1 Image File Format, is an Alliance for Open Media specification that stores AV1-compressed images in a HEIF container (the same box structure as iPhone HEIC photos). It handles transparency, 8-, 10- and 12-bit colour, HDR, wide colour gamuts and animation, and websites like it because the files are small. JPG is the opposite trade-off: decades old, lossy, no transparency, no animation — and readable by practically everything.

When you click Convert, each file's header is checked first. An AVIF begins with an ftyp box whose brands say avif (a still image) or avis (an image sequence); a JPG, PNG or WebP renamed .avif is caught and named, and a HEIC photo is identified as HEIC. Your browser then decodes the AVIF with its own decoder (MDN lists support from Chrome 85, Edge 121, Firefox 93 and Safari 16.1). The canvas is filled with your background colour — white unless you pick another — the image is drawn on top at its full pixel size, and the canvas is saved as JPG at the quality you set, 92 out of 100 by default. If your browser cannot decode AVIF, you get an error saying so rather than a blank file.

The background colour matters because JPG cannot store transparency. Wherever the AVIF is transparent or partly transparent, the pixels are blended with the colour you chose; pick the colour of the page or document the image will sit on. If you need to keep transparency, convert AVIF to PNG instead.

Expect the JPG to be larger than the AVIF. AV1 compression is more efficient than JPEG, so the same picture usually needs more bytes as a JPG. Lower the quality slider for a smaller file; text and sharp edges show JPEG artefacts sooner than photos do.

Colour depth is reduced, too. A browser canvas holds 8 bits per channel in sRGB by default, and JPG output from it is 8-bit, so a 10- or 12-bit, HDR or wide-gamut AVIF comes out as an ordinary 8-bit sRGB JPG; how HDR brightness is mapped down is up to the browser. An animated AVIF gives you its first frame only, and the page says so.

Nothing is uploaded: files are read and converted in your browser's memory, which you can confirm in the developer tools' Network tab. Up to 50 files per batch, each up to 50 MB.

1. Each file must be at most 50 MB, and its ftyp box must carry an AVIF brand (avif or avis); other formats are refused with a message naming what the file really is. 2. Quality must be 1–100 (default 92) and the background a hex colour (default #ffffff). An avis brand adds the note that only the first frame is converted. 3. The browser decodes the AVIF with createImageBitmap. If it cannot, the tool stops with an error naming the browser versions that support AVIF. 4. A canvas the size of the image is filled with the background colour, the image is drawn over it (transparent pixels blend with the colour), and the canvas is encoded with canvas.toBlob("image/jpeg", quality ÷ 100). 5. The output keeps the original file name with a .jpg extension. Download each file, or all of them as a ZIP built in the browser.