.PNG File Extension
Portable Network Graphic
|Developer||PNG Development Group|
4.2 | 1485 Votes
|Category||Raster Image Files|
What is a PNG file?
A PNG file is an image saved in the Portable Network Graphic (PNG) format, commonly used to store web graphics, digital photographs, and images with transparent backgrounds. It is a raster graphic similar to a .JPG image but is compressed with lossless compression and supports transparency.
- Downloading an image from the Internet or an image attached to an email
- Saving a digital photograph with an image editor, such as a logo or icon designed by a graphics professional or web designer
- Taking a screenshot in Windows or macOS 10.4 and later (Ubuntu Linux also stores print screen screenshots in the PNG format)
Why the PNG format was created
PNG was created in 1995 to be a free alternative to the GIF format for transferring images on the web. It improved upon the limitations of the GIF format, which supported a limited number of colors and included a patent license. Additionally, while GIF images only support fully opaque or fully transparent pixels, PNG images may include an 8-bit transparency channel, which allows the image colors to fade from opaque to transparent.
Other PNG features include support for indexed (palette-based) 24-bit RGB or 32-bit RGBA (RGB with a fourth alpha channel) color images. The format also supports full-color, non-indexed RGB or RGBA images and grayscale images.
While the PNG format became more widely used than GIF, PNG is a single-image format, whereas GIF supports multiple images. The GIF format allowed users to save simple animations as GIF files and led to the format's resurgence online, especially on social media. In response to this limitation, the PNG Development Group created the Multiple-image Network Graphics (.MNG) format in 2001, but it was not widely adopted like the GIF format.
Common PNG Filenames
Screen Shot YYYY-MM-DD at HH.MM.SS PM.png - The name given to screenshots taken in macOS, where a timestamp is included in the filename.
How to open a PNG file
You can open PNG images with many free and commercial programs, including most image editors, video editors, and web browsers. Windows and macOS also come bundled with programs that support PNG images, such as Microsoft Photos and Apple Preview.
How to convert a PNG file
Many image editors, including Microsoft Paint, Apple Preview, and Corel PaintShop Pro, can convert PNG files to other formats.
For example, Microsoft Paint can convert PNG files to the following formats: