AVIF to PNG converter

AVIF grew out of the AV1 video codec. The Alliance for Open Media wrote a specification, AV1 Image File Format, that describes how a single AV1 frame is stored in a HEIF container — the same container an iPhone uses for HEIC photos. Version 1.2.0 of that document is dated 16 October 2025 and it sets out what the format can hold: 8, 10 or 12 bits per colour channel, a wide colour gamut, an alpha channel and image sequences, which is how AVIF animates.[1]

PNG is a quarter of a century older. It appeared in 1995 as a replacement for GIF, after Unisys and CompuServe asserted patent claims over the LZW compression both GIF and TIFF used.[2] It was lossless by design: the data is packed so that every pixel can be reconstructed to the exact value it had. The W3C specification allows sample depths from 1 to 16 bits, an optional alpha channel and indexed, greyscale and truecolour images.[3]

The third edition of that specification, published by W3C on 24 June 2025, folded into the standard several things that had been working outside it. The APNG animation chunks, in wide use for years, became official. The cICP chunk arrived, which lets a PNG describe a high dynamic range and wide colour gamut image. The eXIf chunk, the place where camera data lives, moved into the main body of the document. The previous edition was dated 10 November 2003, so this update took PNG more than twenty years.[3]

Drag your AVIF files onto the Add files box, or click it and pick the images from your device. Then press Convert. You can save the results one at a time with the Download button on each queue row, or take the whole batch with Download all.

Quality here is fixed at the maximum. PNG stores the image losslessly, so the output file receives exactly what the browser read out of the AVIF: the same pixel count, the same colours and the same transparent areas.

All of the work happens on your own machine. The page code reads the AVIF file, draws it onto a browser canvas and writes the PNG from there. The image stays on the device from the first click to the last, and it leaves the browser memory when you close the tab.

In the queue on the right, each file shows its size before and after conversion along with the difference in percent. The same summary for the whole batch sits under the buttons. Clear all empties the queue, and the Remove label on a row takes a single file out of it.

Under the converter there is a format switcher reading AVIF to PNG. Clicking either format opens a list, and picking an entry takes you to the converter page that handles that pair.

AVIF saves space the way video does. The encoder predicts what the next patch of the image looks like from the patches around it and stores only the difference, and in lossy mode it drops detail that the eye will not pick up at normal viewing size.

PNG works on a different principle. Its compression has to allow every pixel to be reconstructed exactly, so it packs the data without discarding anything. The more fine detail a photograph carries, the fewer repeating patterns are left to pack, and the closer the file lands to the raw size of the image.

That raw size is easy to work out. A photo measuring 3840 by 2560 pixels holds 9,830,400 points. Each point needs four bytes: one each for red, green and blue, plus one for opacity. Together that is 37.5 MB of data before anything is compressed at all. Lossless PNG brings the same photo down to 18 MB, and that is where it stops.

That is where the number in the tool comes from. In our measurement the same photo weighed 1.29 MB as AVIF and 18.0 MB once written as PNG. An Increased line then appears under the buttons, with the number of megabytes and the percentage the file grew by.