Convert PNG to AVIF. With transparency, without uploading
AVIF can make heavyweight PNG assets much smaller while preserving alpha transparency. Hero images, illustrations, and cut-outs keep their transparent backgrounds. The AV1 encoder runs as WebAssembly in your browser, supports batches, and does not upload the source files. Encoding is CPU-intensive, so large images can take a few seconds.
How it works
- Drop .png files below, singly or in bulk.
- Adjust the quality slider. Even moderate settings look clean in AVIF.
- Save each .avif output and compare file sizes.
Frequently asked questions
Does AVIF keep my PNG’s transparency?
Yes. AVIF has full alpha channel support, so transparent and semi-transparent pixels come through intact. This makes it a genuine PNG replacement for the web, unlike JPG.
Is the conversion lossless?
No. This tool produces lossy AVIF at the quality you select, which is where the large size reductions come from. At high quality settings the difference from the PNG is extremely difficult to see. Keep your PNG originals as the editing masters.
What kind of size reduction should I expect?
It depends on content: photographic PNGs and screenshots often shrink by 80–90%, while simple flat graphics shrink less dramatically. Either way AVIF almost always beats both PNG and WebP on size.
Are my design assets uploaded anywhere?
No. Everything. Decoding the PNG, encoding the AVIF. Happens locally in your browser through WebAssembly. Unreleased designs and client work never leave your machine.