Why is the PNG bigger than the AVIF it came from?

PNG encodes the finished canvas without lossy compression after your selected scaling or background compositing. The size depends on the picture and encoding and can be larger than its AVIF source; the page shows both byte counts and their ratio. Choose JPEG and adjust Quality for a smaller lossy output, or choose 50% or 25% scale to reduce the dimensions.

What happens to transparency when I convert to JPEG?

JPEG has no alpha channel, so transparency cannot be stored in it at all. Rather than filling the clear pixels with black without telling you, the tool makes the background colour part of the conversion: choosing JPEG puts a colour well in the readout, the colour it holds is painted first and the picture is drawn over it. PNG keeps transparency by default, and if you want a flat PNG the Transparency control has a Flatten setting that uses the same colour well. The pane heading always says which of the two is in force, so a logo never comes out with a surprise background.

What happens to an animated AVIF?

It produces one still picture from the first frame only. The conversion uses a canvas and does not retain the image sequence, timing or animation. Keep the AVIF if you need its animation to survive.

How many files can I convert at once, and how large can they be?

You can add 20 files per batch, with up to 30 megapixels per picture, such as 6000 by 5000 pixels. There is no limit on file size in bytes. The page reports when a batch or picture exceeds those limits, and browser memory can also limit conversion.

Are my files uploaded to convert them?

No. The file is read by the browser's own AVIF decoder, drawn onto a canvas in this tab and written back out here, and the zip is built in the tab too. No image byte goes to a server, analytics or error reporting, and no picture is written to browser storage. The tool remembers only settings you explicitly change: format, scale, transparency, background colour and JPEG quality. Opening the JPEG page leaves the main page's remembered format alone.

What if my browser cannot open AVIF at all?

The page tries to decode a small AVIF when it opens. If that fails, it shows a support message and hides the file picker. Update your browser or try another browser with AVIF decoding; an individual damaged or unsupported file can still fail after the initial check.

Can I convert AVIF to JPG here instead of PNG?

Yes. Set Format to JPEG, then choose Quality from 1 to 100 and the background colour for transparent pixels. Downloads contain JPEG data with a .jpg extension. The same individual-file and ZIP downloads apply.

Can I convert AVIF on Mac, Linux or an Android phone?

Use this page in a browser on your device. It can convert files when that browser passes the AVIF support check and provides the canvas conversion APIs. Choose files from the device, convert them and use its browser download controls. No desktop program, app or extension is installed.

How do I keep transparency or full-resolution quality?

Choose PNG, 100% scale and Keep under Transparency to retain decoded image dimensions and alpha. Flatten uses the background colour instead. JPEG is lossy and has no alpha channel, even at Quality 100. HD wording does not add resolution here: conversion cannot restore detail already missing from the source, and 50% or 25% scale reduces it.

AVIF to PNG

Add AVIF images, choose PNG or JPEG, and convert them in this tab. Keep full size or reduce each picture to half or a quarter, then download individual files or the batch as a ZIP. Each row shows the original and converted file sizes.

No files yetPNG, 100%, transparency kept

Convert AVIF pictures here

or drop up to 20 of them on this stage

Never uploadedNo account20 files at onceUp to 30 megapixels each

decoded in this tab

Format

Scale

Transparency

No files open yet. Choose up to 20 AVIF pictures, or drop them on the stage, and they are decoded here in this tab.

PNG keeps every pixel exactly in the finished canvas after chosen resizing or background compositing. Keep retains transparency; Flatten replaces it with your chosen colour. File size depends on the picture and encoding and can be several times larger than the AVIF. Nothing is sent anywhere: the decoder, the canvas and the zip all run in this tab. The tool remembers settings you change: format, scale, transparency, background colour and JPEG quality, and never a picture. Opening the JPEG page does not replace your remembered main-page format.

PNG is losslessafter resizing or background compositing
finished canvas pixels encoded without loss; file size varies
An animated AVIFstated before you convert
first frame only
The limitsper batch and per picture
20 files, 30 megapixels each

Converting, not shrinking. Your browser's own AVIF decoder does the reading, so nothing is uploaded. PNG keeps every pixel exactly in the finished canvas after chosen resizing or background compositing. Its lossless encoding can make it several times larger than the AVIF; size depends on the picture and encoding. An animated AVIF converts its first frame only, and a browser that cannot decode AVIF says so instead of returning a broken file.

Common questions

Why is the PNG bigger than the AVIF it came from?: PNG encodes the finished canvas without lossy compression after your selected scaling or background compositing. The size depends on the picture and encoding and can be larger than its AVIF source; the page shows both byte counts and their ratio. Choose JPEG and adjust Quality for a smaller lossy output, or choose 50% or 25% scale to reduce the dimensions.
What happens to transparency when I convert to JPEG?: JPEG has no alpha channel, so transparency cannot be stored in it at all. Rather than filling the clear pixels with black without telling you, the tool makes the background colour part of the conversion: choosing JPEG puts a colour well in the readout, the colour it holds is painted first and the picture is drawn over it. PNG keeps transparency by default, and if you want a flat PNG the Transparency control has a Flatten setting that uses the same colour well. The pane heading always says which of the two is in force, so a logo never comes out with a surprise background.
What happens to an animated AVIF?: It produces one still picture from the first frame only. The conversion uses a canvas and does not retain the image sequence, timing or animation. Keep the AVIF if you need its animation to survive.
How many files can I convert at once, and how large can they be?: You can add 20 files per batch, with up to 30 megapixels per picture, such as 6000 by 5000 pixels. There is no limit on file size in bytes. The page reports when a batch or picture exceeds those limits, and browser memory can also limit conversion.
Are my files uploaded to convert them?: No. The file is read by the browser's own AVIF decoder, drawn onto a canvas in this tab and written back out here, and the zip is built in the tab too. No image byte goes to a server, analytics or error reporting, and no picture is written to browser storage. The tool remembers only settings you explicitly change: format, scale, transparency, background colour and JPEG quality. Opening the JPEG page leaves the main page's remembered format alone.
What if my browser cannot open AVIF at all?: The page tries to decode a small AVIF when it opens. If that fails, it shows a support message and hides the file picker. Update your browser or try another browser with AVIF decoding; an individual damaged or unsupported file can still fail after the initial check.
Can I convert AVIF to JPG here instead of PNG?: Yes. Set Format to JPEG, then choose Quality from 1 to 100 and the background colour for transparent pixels. Downloads contain JPEG data with a .jpg extension. The same individual-file and ZIP downloads apply.
Can I convert AVIF on Mac, Linux or an Android phone?: Use this page in a browser on your device. It can convert files when that browser passes the AVIF support check and provides the canvas conversion APIs. Choose files from the device, convert them and use its browser download controls. No desktop program, app or extension is installed.
How do I keep transparency or full-resolution quality?: Choose PNG, 100% scale and Keep under Transparency to retain decoded image dimensions and alpha. Flatten uses the background colour instead. JPEG is lossy and has no alpha channel, even at Quality 100. HD wording does not add resolution here: conversion cannot restore detail already missing from the source, and 50% or 25% scale reduces it.

Your browser's own AVIF decoder does the reading, so nothing is uploaded. PNG keeps every pixel exactly in the finished canvas after chosen resizing or background compositing. Its lossless encoding can make it several times larger than the AVIF; size depends on the picture and encoding. An animated AVIF converts its first frame only, and a browser that cannot decode AVIF says so instead of returning a broken file.