PCX to G4 Converter

PCX to G4 conversion — free and online

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Quick Turnaround

Upload and convert PCX to G4 in moments. Server-side processing keeps the workflow fast regardless of your device's capabilities.

Quality Preserved

The conversion transfers all pixel data from PCX to G4 faithfully. No detail is lost during the format change.

Effortless Conversion

The converter handles everything automatically. Just upload your PCX image, pick G4, and the file is ready in moments.

How to convert PCX to G4

1

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

2

Choose g4 or any other format you need as a result (more than 200 formats supported)

3

Let the file convert and you can download your g4 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
G4 is a monochrome image format based on the ITU-T Group 4 facsimile coding standard (Recommendation T.6), ratified by the CCITT in 1984 as an improvement over Group 3 for use on error-free digital networks like ISDN rather than analog telephone lines. G4 files contain 1-bit image data compressed using exclusively two-dimensional Modified Modified READ (MMR) coding, where each scanline is encoded as a set of differences (changing elements) relative to the line above it. By eliminating the one-dimensional coding fallback and the end-of-line synchronization markers required by Group 3, G4 achieves 20-50% better compression ratios on typical document pages while producing a simpler, more regular bitstream. The format is most commonly encountered as a compression method within TIFF files (TIFF compression tag 4), where it became the standard archival format for scanned documents in enterprise document management, government records, and legal imaging systems. G4 compression is specified at 200, 300, or 400 dpi depending on the scanning application, with 300 dpi being the most common for archival-quality document imaging. One advantage is exceptional compression efficiency for document content: G4's two-dimensional prediction exploits the strong vertical correlation in text and line art pages, typically compressing a 300 dpi letter-size page to 30-50 KB — roughly half the size of equivalent Group 3 encoding. The format's entrenchment in document management infrastructure is another strength — G4 TIFF is the mandated format for many government digital records systems, court filing systems, and corporate archives, supported by every enterprise imaging platform.
Developer: ITU-T (CCITT)
Initial release: 1984

Frequently Asked Questions

Why convert PCX to G4?

PCX is a DOS-era bitmap with limited modern support — converting to G4 makes your image accessible in current software and shareable across platforms.

What software opens G4?

Fax software, document imaging systems, GIMP, and archive tools that handle Group 4 compressed fax images.

Is the original resolution preserved?

Yes — the pixel dimensions of your PCX image are maintained in the G4 output. No downscaling or cropping happens during conversion.

Can I convert multiple PCX files at once?

Yes — Convertio supports batch uploads. Queue several PCX files and convert them all to G4 in one session, saving time on repetitive tasks.

Will the image quality change?

Image data is transferred faithfully from PCX to G4. The conversion itself does not degrade or enhance the original pixel information.

Do I need to pay for this converter?

Basic PCX to G4 conversions are free. Convertio offers premium tiers for heavier workloads with faster processing and priority support.