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Convert PNG Images to AVIF

Processed entirely in your browser. Never uploaded to a server.

Drop PNG images here or click to browse

Processed entirely in your browser. Never uploaded to a server.

PNG is lossless and keeps transparency, but it's a poor fit for anything photographic and a heavy download for a website. AVIF keeps the alpha channel PNG gives you while compressing far more aggressively, which is the usual reason to make this switch for web assets.

Expect this one to take a while

The encoder is a WebAssembly build of libavif and it's about three megabytes, downloaded once on your first conversion. AVIF encoding is slow by nature — it inherits AV1's expensive search — so a large image can take a few seconds per file. All of it runs on your device; nothing is uploaded.

FAQ

Does the transparency survive?
Yes. AVIF supports a full alpha channel, and this converter carries a PNG's transparency straight through to the AVIF — including partial transparency, not just an on/off mask. If you're replacing PNG icons or graphics with alpha on a website, AVIF is a safe target for that.
Is this a lossless conversion?
No, by default it isn't. PNG is always lossless; this tool encodes the AVIF at a lossy quality setting because that's where most of the file-size win comes from. If you need a bit-for-bit-safe copy in a smaller lossless format, this isn't it — AVIF supports a lossless mode, but a general-purpose converter tuned for lossy web output isn't the place to rely on that.
How much smaller will the file be?
Often dramatically smaller, especially for photographic PNGs — PNG compresses losslessly and doesn't handle photos efficiently at all, so a lossy AVIF re-encode of a photo saved as PNG can come out at a fraction of the size. Flat-color graphics, icons, and screenshots shrink too, just less dramatically since PNG already compresses that kind of content well.
Why was my image a PNG in the first place if it's a photo?
Usually because it was screenshotted, exported from a design tool, or downloaded from somewhere that only offered PNG. PNG is the right call when you need pixel-perfect output or transparency; it's not chosen for photos on purpose. Converting it to AVIF fixes the size without losing the transparency that PNG was probably there for.

Need the lossless PNG back, or software that can't open AVIF? Use AVIF to PNG.

Want more control over the output size or dimensions? Try Compress Image or Resize Image.

Curious what makes AVIF different from PNG? Read AVIF explained. Before you commit to it site-wide, check where AVIF is and isn't safe to use.