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PNG, which is an acronym for Portable Network Graphics, is the most well-known raster image format on the internet, that supports lossless data compression. Although the PNG was designed to replace GIF, it introduced new useful features. As it is designed to be simple and portable, developers are able to easily implement the PNG format. Also, it supports full alpha channel which makes the PNG a good choice for designing icons and logos which need transparency.
Although PNG is categorized as a lossless image format, both true-color and indexed-color images are compressed effectively, using Deflate lossless data compression algorithm, which is a combination of LZ77 and Huffman Coding.
| Name | Portable Network Graphics | ||||||||||||||||||
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| File Extension(s) | .png | ||||||||||||||||||
| Category | Raster Images | ||||||||||||||||||
| Use For | Digital arts including flat images, logos, and icons. Diagrams, drawings, charts, detailed screenshots, and web graphics. | ||||||||||||||||||
| Developer | PNG Development Group | ||||||||||||||||||
| MIME Type(s) | image/png | ||||||||||||||||||
| License | ©2003 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C liability, trademark, document use and software licensing rules apply. No known royalty-bearing patents. | ||||||||||||||||||
| File Sample(s) | N/A | ||||||||||||||||||
| Compression | Lossless, optionally indexed color like GIF. DEFLATE algorithm. | ||||||||||||||||||
| Max Dimensions | 2,147,483,647×2,147,483,647 pixels | ||||||||||||||||||
| Color Modes |
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| Animation | No | ||||||||||||||||||
| Transparency | Yes | ||||||||||||||||||
| Interlacing | Yes | ||||||||||||||||||
| Metadata | Yes | ||||||||||||||||||
| Layers | No | ||||||||||||||||||
| Multipage | No |