Convert your images to PCX format

A Pioneer from the DOS Era

Long before JPEG and PNG dominated our screens, there was another format that ruled the world of PC graphics. The PCX format, short for Picture Exchange, was one of the very first widely adopted image file types on IBM compatible computers. It was created by ZSoft Corporation in the mid 1980s as the native format for its popular PC Paintbrush program, a trailblazing application that brought digital art to the masses during the era of MS DOS. For many early computer users, PCX was their first introduction to digital images, making it a true pioneer of personal computer graphics.

Simple Compression for a Simpler Time

At its core, a PCX file is a raster image, storing picture data as a grid of pixels. Its key innovation was the use of a simple but effective form of lossless compression called run length encoding, or RLE. This technique works by finding consecutive runs of identical pixels and storing them more efficiently. Instead of saving a pixel's color information over and over again, for example "blue, blue, blue, blue, blue," the file would simply store a count and a color, like "five blue."

This method was particularly well suited for the kinds of graphics common at the time, which often featured large areas of solid color, such as in charts, diagrams, and early video game sprites. For these images, run length encoding could significantly reduce file sizes compared to uncompressed formats like the early BMP. However, this compression scheme was far less effective on complex, photorealistic images where neighboring pixels are rarely the same.

The Rise and Eventual Decline

During the late 1980s and early 1990s, PCX became a de facto standard. Its association with PC Paintbrush, which was even bundled with early versions of Microsoft Windows, meant it was supported by a huge range of software, from desktop publishing applications to word processors and early scanners. It was the go to format for saving and sharing images in the pre internet age. Many classic DOS games used the PCX format to store their graphical assets, from background screens to character animations.

However, as technology advanced, the limitations of PCX became more apparent. The rise of the World Wide Web created a demand for formats with much more efficient compression. GIF, with its superior LZW compression and support for animation, became the standard for online graphics. JPEG, with its revolutionary lossy compression, made it possible to store high quality photographs in very small files. At the same time, Microsoft's own BMP format became the native default for Windows. Faced with this competition, the once dominant PCX format began its slow fade into obscurity.

A Respected Digital Relic

Today, the PCX format is almost entirely obsolete. Modern image editing software may still offer support for it, but it is rarely used for creating new images. Its primary role now is a historical one. You might encounter a PCX file when exploring the files of a classic video game or trying to open very old documents from the DOS era. While it has been replaced by more powerful and efficient formats, PCX holds an important place in computing history as one of the foundational building blocks that helped create the rich visual world we know today.