PCX Image (.PCX)
PCX (PiCture eXchange) is one of the earliest widely used bitmap image formats, originally developed by ZSoft Corporation for its PC Paintbrush program in the 1980s. It uses a simple run-length encoding (RLE) compression scheme and supports color depths from 1-bit to 24-bit. PCX was once the dominant bitmap format on DOS and early Windows platforms but has been largely superseded by PNG and JPEG.
Advantages of PCX Image
What the PCX format does well, and why you might choose it.
- Simple RLE compression is fast to encode and decode
- Lossless compression preserves image quality
- Widely supported by legacy imaging software
Limitations of PCX Image
What the PCXformat doesn't do well, and when to choose another format.
- Largely obsolete, replaced by modern formats like PNG
- RLE compression is inefficient for complex photographic images
- Limited to 24-bit color with no alpha transparency support
What PCX files are used for
- Legacy application compatibility and file conversion
- Historical document archival from older systems
- Retro computing and DOS-era software
How PCX files work
Raster images are grids of pixels, each carrying color information. The format determines how those pixels are stored: lossless formats (PNG, TIFF, BMP, WEBP-lossless) preserve every pixel exactly, lossy formats (JPG, WEBP, AVIF, HEIC) discard imperceptible detail to shrink the file. Color depth (8-bit, 10-bit, 16-bit), color profile (sRGB, Display P3, ProPhoto), alpha channel support, and metadata (EXIF, IPTC, XMP) all vary by format. Modern web formats like AVIF and WEBP build on improvements in video compression to deliver dramatically smaller files at equivalent quality versus JPG and PNG.
Best practices when working with PCX
Photographs compress well as JPG or AVIF; graphics with sharp edges, text, or transparency belong in PNG or WEBP-lossless. Never re-save a JPG repeatedly — every save adds compression artifacts. Strip EXIF metadata before publishing photos publicly if you don't want GPS coordinates and camera serial numbers exposed. For print, deliver in TIFF at 300 DPI; for screen, JPG/WEBP at 72-100 DPI is plenty. If you're optimizing for the web, AVIF beats WEBP beats JPG on file size, but JPG still has the broadest support.
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The most common formats people convert to PCX, ready to convert in seconds.
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Choosing PCX versus the alternatives
JPG: photographs, social media uploads, anywhere universal compatibility matters. PNG: graphics with text, line art, screenshots, or transparency. WEBP: modern web replacement for JPG and PNG with better compression. AVIF: best-in-class web compression, growing browser support. TIFF: print and archival masters. BMP: rarely the right answer in 2026 — uncompressed and uniform-poor versus PNG. HEIC: efficient mobile photo capture, but limited compatibility outside Apple's ecosystem.
Where PCX fits in real workflows
Most image workflows have a master file (PSD, RAW, TIFF) that you keep forever and never publish, plus delivery exports (JPG, WEBP, AVIF) generated for each context where the image appears. Treat published files as derivatives — if quality requirements change, regenerate from the master rather than re-converting an already-compressed version.
Privacy and file handling
When you convert a PCXfile with MegaConvert, the file is uploaded to our converter, processed, and automatically deleted within an hour. We don't train models on your files, share them with third parties, or retain them after the conversion completes. The download link expires when the file is removed. If your work involves files subject to NDA or compliance requirements (HIPAA, GDPR data processing), please review our privacy policy before uploading sensitive material.
Frequently asked questions about PCX
What is a .PCX file?
PCX (PiCture eXchange) is one of the earliest widely used bitmap image formats, originally developed by ZSoft Corporation for its PC Paintbrush program in the 1980s. It uses a simple run-length encoding (RLE) compression scheme and supports color depths from 1-bit to 24-bit. PCX was once the dominant bitmap format on DOS and early Windows platforms but has been largely superseded by PNG and JPEG.
What is the MIME type of PCX?
The official MIME type for PCX files is image/x-pcx. This is the value web servers and applications use to identify the format when transferring files.
What category does PCX belong to?
PCX is a Image Converter format. Files in this category share common conversion paths and use cases.
How do I open a .PCX file?
PCX files are typically opened by software that natively supports the PCX Imageformat. If you don't have a compatible application, the most reliable approach is to convert the file to a more universal format using the converters listed above. Most PCX Image files convert to widely-supported alternatives in seconds.
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