There is no size limit to a PNG — they can easily be 140GB or larger.

How large is a PNG image?

Anywhere from somewhere around 150 Bytes to somewhere around 1875 Kilobytes. Compression efficiency depends entirely on the contents.

What is the max resolution for PNG?

PNG-8 means 8 bits, so 256 colors maximum. PNG-24 means 24 bits, so 16,7 million colors max. Resolution is not an inherent factor of any format, so saying a PNG-8 is “low resolution” does not make sense, it only has low number of colors.

Can a PNG file be high resolution?

png is a lossless compression file type, which means it can withstand compression into smaller sizes without sacrificing image quality. The high resolution of the original is maintained throughout the compression process, and once the image is unpacked and reverted to its normal size, the quality is the same.

What is the maximum number of pixels in a PNG image?

@Stefano: The standard says size is 32 bit unsigned integer so the theoretical limit would be somewhere around 4 billion pixels (nine zeros) x and y. As mentioned by Mark Ransom, a straightforward implementation of PNG would require almost 3GB to render your 30k by 30k pixel image.

How many bytes are there in a PNG file?

PNG file contains 8-bytes header. JPEG file (see specification) contains 2-bytes header (SOI) followed by series of markers, some markers can be followed by data array. Each type of marker has different header format. The bytes where the image is stored follows SOF0 marker (10-bytes length).

How big can a PNG image be resized?

A naive implementation of resizing would require the image to be blown up to 2.7GB in size before it is displayed. This would clearly be too large for a normal 32-bit program to handle. The PNG specification doesn’t appear to place any limits on the width and height of an image; these are 4 byte unsigned integers, which could be up to 4294967295.

What is the maximum size of a 32-bit unsigned integer in PNG?

PNG doesn’t technically use 32-bit unsigned integers; it uses 31-bit unsigned integers padded with an extra zero bit. This was done to accommodate languages which don’t have unsigned integer types. The upper limit on image width or height is thus 2^31-1 or 2,147,483,647. – DK. Mar 20 ’11 at 3:53 1