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PNG to AVIF Converter

Turn PNG files into AVIF in a couple of clicks. PNG is a lossless image format with full alpha transparency; AVIF is a next-gen format with the best compression available today. Some detail is discarded to fit the target format; how much depends on the format and your settings.

Not uploaded to any serverConverted on this deviceGone when you close the tabHow this works

Drop your files here

PNG files (.png) · up to 120 MB each

or paste files from your clipboard

Ready when you are

Drop a PNG file above and FileTools360 will turn it into AVIF — right here on your device, without uploading anything.

⌘K to search converters

How to use it

1
Add your PNG files
Drag them onto the drop area, choose them from your device, or paste them from your clipboard. You can queue several at once. Nothing is sent anywhere — the file stays on this device.
2
Adjust the settings if you want to
The defaults suit most people. Open Advanced to control quality and metadata removal.
3
Convert and download
Press Convert. Everything happens on your own device — nothing is uploaded. Download files one by one, or grab them all as a ZIP.

Privacy, in plain words

Is it safe? Your PNG file is not uploaded anywhere

What “uploaded” normally means. On most online converters, pressing the button copies your file across the internet onto a computer owned by that website. That copy is what the word “upload” means, and it is the part nobody explains.

What happens instead. This site does not do it. There is no server here that receives files, so your PNG file is read, converted and handed back by the browser you are using right now. It never travels — so there is no copy to store, read, leak or hand over.

Check it yourself in ten seconds

Turn off your Wi-Fi after this page has loaded, then convert a file anyway. It still works, because everything needed is already on your device.

The longer explanation of how this works, and the full detail of what is and is not stored on the privacy page.

Why this matters more than it sounds

Photographs carry more than what is in the frame — most also carry the time, the device and often the GPS coordinates where they were taken. It matters more than it sounds, because of what images usually are:

Screenshots of bank transfers

account details, and proof of what you paid whom

Medical scans and photographs

X-rays, results, images of a condition

Photographs of children

family pictures that should stay in the family

Passport and visa photos

biometric-grade images of your face

A file that is never sent cannot be kept, leaked, subpoenaed or used to train anything. That is a property of how this works, not a promise about how carefully it is run.

PNG and AVIF explained

PNG is a lossless raster format built to replace GIF. It stores every pixel exactly as given and supports a full 8-bit alpha channel, which means genuine partial transparency rather than the single transparent colour GIF offers.

AVIF stores still images using the AV1 video codec's intra-frame compression. It generally achieves the smallest files of any widely supported format, and it handles wide colour gamut and HDR, which JPEG cannot.

Where PNG files come from: Screenshots, exported logos and UI assets, and anything designed rather than photographed.
Where AVIF is used: Performance-focused websites and modern image pipelines.

PNG vs AVIF

The two formats solve different problems, which is why converting between them involves trade-offs rather than a straight upgrade.

PNG compared with AVIF
Property	Source	Target
Compression	Lossless	Lossy or lossless
Transparency	Yes	Yes
Animation	No	Yes
Introduced	1996	2019
Browser support	Universally supported.	Modern browsers only. Limited desktop app support.

PNG is stronger at: Completely lossless — re-saving never degrades the image. Full alpha transparency, including soft edges and shadows. Sharp text and hard edges stay sharp.
AVIF is stronger at: The best compression of any broadly supported image format. Handles HDR and wide colour gamut. Supports transparency and animation.

Why convert PNG to AVIF?

People make this switch when they run into the limits of PNG: you are publishing photographs on the web, where it will be several times larger than it needs to be. AVIF is the better fit when you control the audience (a modern website) and file size is the priority.

PNG limitations that prompt the switch: Much larger than JPEG or WebP for photographic content. No animation in practice (APNG exists but support is inconsistent). No native support for CMYK or print colour workflows.
What you give up: Encoding is slow compared with JPEG or WebP. Desktop application support is still thin.

Does converting PNG to AVIF reduce quality?

AVIF compresses without discarding data, but it cannot represent everything a PNG file holds. What does not fit is discarded permanently, so converting the result back will not restore it. Keep the PNG original if it is the only copy.

Measured, not estimated

What converting PNG to AVIF actually costs

On every sample measured, the AVIF came out smaller — 2.1× smaller at worst and 76× smaller at best.

1 of the 5 samples came back pixel-identical. The rest did not, scoring as low as 0.995 similarity against the input.

Each row is one sample chosen to isolate a property these formats treat differently.
Sample	PNG in	AVIF out	Change	Similarity
Smooth gradientContinuous tone with no detail — the easiest thing to compress, and where banding shows first.	331 KB	4.3 KB	−99%	0.995
Hard-edged text and UIHigh-contrast edges. This is where JPEG's ringing artefacts appear and where PNG wins.	87.4 KB	40.9 KB	−53%	1.000
Film-like noiseRandom detail. Incompressible by design — the worst case for every lossy codec.	1.1 MB	229 KB	−79%	0.995
Flat colour blocksLarge areas of one colour — a logo or a chart. Lossless formats should crush this.	4.9 KB	736 B	−85%	1.000
Soft alpha edgeA transparent gradient. JPEG cannot store it at all, which is the single most common reason a conversion surprises someone.	55.6 KB	2.2 KB	−96%	0.999

Produced by a stand-in encoder. Your browser's own encoder has no equivalent outside a browser, so this was measured with the same codec at the same quality from a different implementation. Expect the shape of the answer to hold and the exact bytes to differ.

Samples are generated from a fixed seed rather than taken from real photographs or documents, so the corpus is reproducible and carries no licensing question — and so the numbers predict the shape of your result rather than its exact size. Measured 2026-10-01. The method, and the command that regenerates every figure on this page, are on the how it works page.

About these formats

Source

Portable Network Graphics

Lossless image format with full alpha transparency.

Extensions: .png
MIME type: image/png
Best for: Transparency · Graphics and logos · Screenshots
Compatibility: Universally supported.

Target

AV1 Image File Format

Next-gen format with the best compression available today.

Extensions: .avif
MIME type: image/avif
Best for: Smallest web images · HDR and wide gamut · Photography
Compatibility: Modern browsers only. Limited desktop app support.

Good to know

PNG to AVIF Converter — questions

How do I convert PNG to AVIF?

Drop your PNG file onto the area above, then press Convert. The AVIF file saves straight to your device. You do not need an account, and there is no watermark.

Is it safe to convert PNG files here — are they uploaded to a server?

No, nothing is uploaded. On most online converters, pressing the button copies your file across the internet onto a computer owned by that website; it is converted there and sent back. That copy is what "upload" means, and it is the part that puts your file out of your control. This site does not do it. Your PNG file is read and converted by the browser you are using right now and never leaves this device, so there is no copy for anyone to store, read or hand over. You can prove it: turn off your Wi-Fi after this page loads and the conversion still works.

Can I convert confidential PNG files, like bank statements or contracts?

Yes, and that is the case this site was built for. Because the file never leaves your device, a confidential document is no more exposed than it is sitting in your own folder — there is no transfer, no copy on someone else's hardware, no retention period to read about and no staff with access. Nothing is logged about the file either: not its name, not its size, not its contents. The one thing worth saying plainly is that this protects the file in transit and at rest on our side, not from anything already on your own computer.

Does converting to AVIF reduce quality?

AVIF uses lossy compression, so some data is discarded. At the default quality the difference is very hard to see or hear; raise the quality setting if you need to be certain, at the cost of a larger file.

How large a file can I convert?

Up to 120 MB per file for this conversion. Because the work happens in your browser, the practical limit is your device's memory — larger files work on a desktop with plenty of RAM and may fail on an older phone.

Can I convert several files at once?

Yes. Add as many as you like and press Convert All. Each file is processed independently, so one failure does not stop the rest, and you can download everything together as a ZIP.

Can I use this on my phone?

Yes. FileTools360 works in mobile browsers on iOS and Android, including choosing files straight from your camera roll. Very large images may run out of memory on a phone — those are better converted on a laptop.