PNG to AVIF Converter

Encodes a PNG image as AVIF, a next-generation format based on the AV1 video codec, using a WebAssembly build of the libavif encoder that runs entirely inside your browser.

Drop or select one PNG file. The image is drawn to a canvas and its pixels are handed to the WebAssembly AVIF encoder; a ready-to-download AVIF file appears once encoding finishes, typically within a few seconds.

Upload logo.png (610 KB, with a transparent background) and you get logo.avif ready to download — usually a much smaller file, with the transparent background preserved, encoded at the tool's default quality setting of 75.

PNG's lossless compression keeps files large, especially for photographic content; AVIF's lossy but highly efficient compression — while still supporting transparency — typically produces a far smaller file for a similar look.

Encoding runs a full WebAssembly build of the AV1 image encoder in your browser, which is more computationally demanding than a simple format conversion — large images can take several seconds instead of appearing instantly. AVIF preserves the PNG's alpha (transparency) channel, but because the output is compressed with lossy quality-75 encoding by default, pixels are no longer an exact match to the lossless source.

Only one file can be converted at a time — there's no batch mode or quality slider yet. Some older devices, email clients and desktop software still don't display AVIF, so keep the PNG if you're unsure the recipient supports it.

Encoding uses a WebAssembly build of the open-source libavif library (the reference AVIF codec). The whole process runs locally in your browser; your image is never uploaded to a server.