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Filesvo

PNG to AVIF Converter

Turn heavy PNG files into AVIF, keeping the alpha channel intact. Filesvo runs an AV1 encoder inside your browser, so the conversion is local and your images are never uploaded.

or drag and drop PNG files here — you can also paste from the clipboard

Processed on your device — files are never uploaded to Filesvo.

How to use Filesvo

  1. Select or drop PNG files, or paste an image from your clipboard.
  2. Choose a quality — transparency is carried over automatically.
  3. Click Convert to AVIF. The first file waits for a one-time encoder download.
  4. Download the results.

PNG vs AVIF

PNG is lossless, which is exactly why it is large: a full-page screenshot or a detailed illustration routinely runs to several megabytes. AVIF compresses the same picture with the AV1 codec and supports a full alpha channel, so transparent logos, UI assets and screenshots keep their transparency at a fraction of the weight.

AVIF at the default quality is lossy — that is where the size saving comes from. For a photograph or a screenshot destined for a web page that is the right trade. For a master copy, an icon that must stay pixel-exact, or artwork you will edit again, keep the PNG.

Encoding uses libaom compiled to WebAssembly, because no browser can write AVIF on its own. It downloads once, is cached afterwards, and runs entirely on your device.

Private by design

Your files are processed directly in your browser using open-source codecs compiled to WebAssembly that run inside the page and are not uploaded to Filesvo. Nothing is stored on our servers, because nothing ever reaches them.

The engine is a static file your browser downloads once and then caches — the only network request this tool makes. It is used exactly as its authors published it; see the engines and their licences.

Frequently asked questions

Is transparency kept when converting PNG to AVIF?
Yes. AVIF stores alpha as a separate channel alongside the colour data, so transparent and semi-transparent areas of your PNG survive the conversion.
Is the AVIF lossless like the PNG was?
No. Filesvo encodes lossy AVIF, which is what makes the files so much smaller. Raising the quality slider keeps more detail at the cost of size; if you need a byte-exact copy of the original pixels, stay with PNG.
Why does the first conversion pause?
It is downloading the libaom AV1 encoder, once — a 3.5 MB file, roughly 1.1 MB compressed in transit. Browsers cannot create AVIF themselves, so Filesvo brings its own. After the first run it is cached and conversions start straight away.
Do my files leave my device?
No. Only the encoder travels — downwards, to you. Your PNGs are read, converted and saved entirely inside your browser.

Related Filesvo tools

JPG to AVIF

Convert JPG photos to AVIF — the smallest modern image format — using a real AV1 encoder in your browser.

AVIF to PNG

Convert AVIF images to lossless PNG with transparency preserved — all in your browser.

PNG to WebP

Convert PNG images to compact WebP files with transparency preserved — in your browser.