How this works in your browser
AVIF applies still-image compression derived from the AV1 video codec, using the same intra-frame prediction and transform machinery that encodes a single video frame. That is precisely why it compresses so well and why it is slow: the encoder searches through many possible ways to predict and partition each block to find the most efficient representation, which is real computation rather than a lookup. Browsers can decode AVIF natively but do not expose an encoder, so a dedicated encoder runs in the page to produce the file. The alpha channel is carried through the same pipeline, which is what lets AVIF replace PNG for transparent graphics rather than only competing with JPEG.
PNG to AVIF vs. traditional online converters
| Feature | PNG to AVIF (in-browser) | Traditional online converters |
|---|---|---|
| File upload required | No - never leaves your device | Yes - file is sent to a server |
| Processing queue | None - starts instantly | Often, especially at peak times |
| Watermark on output | Never | Common on free plans |
| Usage limits | None - free, unlimited use | Often capped per day or file size |
| Works offline once loaded | Yes, for most tools | No - requires a live connection |
| Account required | No | Often, for anything beyond a trial |
Who uses PNG to AVIF
Cutting page weight
Replace large PNG hero images and photography with far smaller files that look the same.
Compressing transparent graphics
Shrink logos and cut-outs that need an alpha channel and would otherwise stay as heavy PNGs.
Improving Core Web Vitals
Reduce the bytes that Largest Contentful Paint is usually waiting on, since images tend to dominate page load.
How to use PNG to AVIF
- 1
Open the PNG to AVIF converter
Go to tools.slaytic.com and open the PNG to AVIF tool. No sign-up or account required.
- 2
Drop your PNG file
Add the image and expect a wait, since AVIF encoding is genuinely CPU-intensive, particularly on a phone.
- 3
Download the AVIF
Save the result, typically far smaller than the PNG with transparency preserved.
Frequently asked questions
Why does this take longer than other conversions?
AVIF encoding is computationally heavy. Unlike JPG, PNG, or WEBP - which browsers can encode natively and instantly - AVIF encoding runs a dedicated in-browser encoder, which takes real processing time, more on mobile devices.
Is transparency preserved?
Yes, AVIF supports an alpha channel like PNG.
Will every browser display the AVIF result?
Yes, all current major browsers can display AVIF images, though very old browser versions may not.
Should I choose AVIF or WEBP?
AVIF compresses harder, often meaningfully smaller than WEBP at the same quality, which makes it the better choice when bytes genuinely matter. WEBP encodes almost instantly, has slightly broader support in older software, and is easier to work with in bulk. For a handful of hero images, AVIF. For a large batch, WEBP is usually the pragmatic call.
Should I delete the original PNG?
No, keep it as your master. AVIF is a lossy delivery format, so re-exporting from it later compounds the compression. Archive the PNG and treat the AVIF as a build output you can always regenerate.
Is AVIF worth it for a small logo?
Rarely. The encoding cost is fixed while the saving scales with image size, so a 4KB icon gains almost nothing for a noticeable wait. The benefit is real on large photographic images where a percentage saving is worth actual kilobytes.
Is my image uploaded anywhere?
No. Despite the heavy processing, the encoder runs inside your browser tab rather than on a server.