PCX to JBG Converter

Online PCX to JBG image converter — free to use

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Format Bridge

Bridge the gap between PCX and modern formats. The converter handles the technical translation so you get a clean JBG file.

Server-Side Speed

Conversion happens on remote servers, so your computer or phone does not slow down. Upload PCX, get JBG — all handled in the cloud.

Privacy Protected

Convertio removes uploaded PCX files right after processing and purges JBG results within 24 hours. Your data does not linger on servers.

How to convert PCX to JBG

1

Select files from Computer, Google Drive, Dropbox, URL or by dragging it on the page.

2

Choose jbg or any other format you need as a result (more than 200 formats supported)

3

Let the file convert and you can download your jbg file right afterwards

About formats

PCX (PiCture eXchange) is a raster image format created by ZSoft Corporation in 1985 as the native format of their PC Paintbrush application, one of the first painting programs for IBM PC compatibles. The format uses a simple run-length encoding (RLE) compression scheme that works by replacing consecutive identical pixel values with a count-value pair, achieving modest compression on images with large areas of uniform color. A PCX file consists of a 128-byte header (specifying dimensions, color depth, palette information, DPI, and encoding method), the RLE-compressed pixel data organized in scan-line order, and an optional 256-color palette appended after the image data. The format evolved through several versions supporting increasing color depths: 1-bit monochrome, 4-bit (16 colors), 8-bit (256 colors), and 24-bit true color using multiple color planes. PCX became one of the most popular image formats during the DOS era, widely supported by paint programs, word processors, desktop publishers, and early games throughout the late 1980s and early 1990s. One advantage was broad DOS-era software compatibility — PCX served as a practical interchange format when competing programs used proprietary raster formats. The simplicity of RLE decoding is another strength, requiring minimal CPU and memory resources ideal for the hardware of that period. While PNG, JPEG, and other modern formats have replaced PCX in contemporary use, the format remains encountered in legacy archives and retro computing contexts.
Developer: ZSoft Corporation
Initial release: 1985
JBG is a file extension for images compressed using the JBIG (Joint Bi-level Image experts Group) standard, formally ITU-T Recommendation T.82, completed in 1993 as a successor to the Group 3 and Group 4 fax compression standards. JBIG compression is designed for bi-level (black and white) images but can also handle grayscale and limited-color images by encoding each bit plane separately. The algorithm uses a form of arithmetic coding guided by an adaptive context model: for each pixel, the encoder examines a template of surrounding already-coded pixels to build a probability estimate, then feeds this estimate to a QM-coder (a variant of the Q-coder arithmetic coder) that produces a highly efficient binary output. JBIG achieves 20-40% better compression than Group 4 on typical document images, with the improvement being even larger on halftoned photographs and images with gradual density transitions where Group 4's simple run-length approach is less effective. The standard supports progressive encoding, where a low-resolution version of the image is transmitted first and progressively refined — useful for fax-like applications where the receiver can begin displaying the image before the full-resolution data arrives. One advantage is superior compression of documents containing halftone images: newspapers, magazines, and marketing materials that mix text with photographic halftones compress dramatically better with JBIG than with Group 3/4. The standard's ITU-T backing ensures it is implemented in document imaging hardware and software worldwide. JBG files are supported by ImageMagick and various document imaging tools.
Initial release: 1993

Frequently Asked Questions

Why convert PCX to JBG?

PCX was designed for 1980s PC software. Converting to JBG modernizes the file so it works with contemporary tools, browsers, and operating systems.

Which apps support JBG format?

Document imaging software, GIMP, and fax systems that use JBIG compression for black-and-white images.

Do I need to pay for this converter?

Basic PCX to JBG conversions are free. Convertio offers premium tiers for heavier workloads with faster processing and priority support.

Is the conversion fast?

Yes — PCX to JBG conversion on Convertio runs on cloud servers and completes in seconds for typical image files.

Is the original resolution preserved?

Yes — the pixel dimensions of your PCX image are maintained in the JBG output. No downscaling or cropping happens during conversion.

Where can I upload PCX files from?

You can upload from your local device, Google Drive, Dropbox, or paste a direct URL. Convertio pulls the PCX file from any of these sources.