Convert PNG images to AVIF locally - much smaller files with transparency kept, no upload.
Running locally on your device ...
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Your files never left your device
No. Everything runs in your browser - your file never leaves your device. How this is verifiable
PNG files are often large. AVIF usually stores the same image far more compactly while keeping transparency - ideal for logos and graphics on fast websites.
The PNG is decoded locally and encoded as AVIF with a self-hosted codec; the alpha channel is preserved. The quality slider controls the file size. Nothing is uploaded.
AVIF pays off here especially with large photos or illustrations full of gradients: there the lossy method brings huge savings a lossless PNG can never reach. For a flat graphic with few colours - a simple logo or an icon - the difference is smaller, and a well-optimised PNG can keep up. AVIF also supports a wide colour gamut and high bit depths, which avoids visible banding in photos with subtle brightness transitions.
In practice on the web you use this format to make a page's often heavyweight PNG screenshots and product images noticeably lighter without visitors noticing a difference. Always check the result with your own eyes, though: set the slider high enough that sharp labels or fine lines do not fray, and keep the lossless original in case you want to edit the subject again later.
| Input formats | PNG |
|---|---|
| Output format | AVIF |
| Batch processing | Yes |
| Processing | Locally in your browser (WebAssembly) |
| File upload | None |
Limitations: AVIF is lossy (even at high quality); for pixel-exact lossless graphics, PNG remains better. Older programs may not open AVIF.
Yes, AVIF supports transparency and the alpha channel is kept.
For graphics and photos often much smaller than the PNG, depending on quality.
No, everything runs locally in the browser.
Yes, download individually or as a ZIP.