HRZ to XPM Converter

Export HRZ to XPM — simple online conversion

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Universal Access

Convert niche HRZ data into standard XPM that opens on any device. Bridge the gap between specialized and mainstream formats effortlessly.

Visual Fidelity

Your HRZ imagery is carefully converted to XPM with maximum quality retention. No unnecessary degradation during the transformation process.

Privacy Protected

Uploaded HRZ data is erased immediately after conversion. XPM results are purged within 24 hours — your content stays confidential.

How to convert HRZ to XPM

1

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

2

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

3

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

About formats

HRZ is a simple raster image format associated with slow-scan television (SSTV), a method of transmitting still images over radio frequencies used by amateur radio operators since the late 1950s when Copthorne Macdonald pioneered the technology. HRZ files store images at a fixed resolution of 256x240 pixels in raw RGB format, with each pixel represented as three bytes (red, green, blue) at 8 bits per channel, producing uncompressed files of exactly 184,320 bytes. The format has no header, no metadata, and no compression — the file is simply a sequential dump of raw pixel data in row-major order. This extreme simplicity reflects the format's origins in the amateur radio community, where SSTV images are transmitted as audio tones encoding luminance and chrominance values over narrow-bandwidth HF (shortwave) radio channels. The fixed 256x240 resolution corresponds to common SSTV transmission modes, and HRZ files serve as the digital capture or storage medium for received SSTV transmissions. One advantage is the format's zero-overhead structure: with no parsing, decompression, or metadata processing required, HRZ files can be read by any program capable of reading raw pixel data with known dimensions — a single function call in virtually any programming language. The format's connection to amateur radio SSTV culture is another notable aspect: HRZ files document a unique form of image communication where operators transmit photographs over thousands of miles using nothing but radio waves and audio encoding, a practice that continues today alongside digital modes. HRZ files can be opened by ImageMagick, GIMP, and specialized SSTV software.
Developer: SSTV Community
Initial release: 1985
XPM (X PixMap) is a color image format for the X Window System, developed by Arnaud Le Hors at GROUPE BULL beginning in 1989 as the color successor to the monochrome XBM format. Like XBM, XPM files are valid C source code — each file defines the image as a static array of character strings, where the header strings specify width, height, number of colors, and characters per pixel, the color definition strings map character codes to color values (supporting X11 color names, hexadecimal RGB, and symbolic color types like 'background' and 'foreground'), and the pixel strings encode each row as a sequence of character codes that index the color palette. This ASCII art representation makes XPM images human-readable: one can often see the image content directly in the text of the source file. The format went through three revisions: XPM1 (1989, compatible with X10), XPM2 (simplified syntax), and XPM3 (1991, the current version with the static char* syntax and extended color specification). XPM was the standard format for X Window application icons, splash screens, pixmap buttons, and themed UI elements throughout the 1990s and 2000s. One advantage is the combined benefits of being a valid C source file and a color image: XPM files can be compiled into applications, edited in any text editor, processed by text tools, and version-controlled, while supporting up to 256 colors with transparency (using the 'None' color keyword). The X11 ecosystem's reliance on XPM ensures broad tool support. XPM files are handled by all X11 toolkits, ImageMagick, GIMP, and web browsers (legacy support).
Initial release: 1989

Frequently Asked Questions

Why convert HRZ to XPM?

Most people lack software for HRZ. Converting to XPM ensures your SSTV images are viewable everywhere — from phones to desktops.

What programs open XPM?

Any modern image viewer opens XPM — Windows Photos, macOS Preview, GIMP, Photoshop, and web browsers all support it.

Is the conversion instant?

Near-instant for typical images — the cloud-based processing handles HRZ to XPM conversion quickly. Very large data may take a moment.

What is the HRZ format?

HRZ is used in amateur radio slow-scan television. It stores radio-transmitted images and ham radio communication — converting to XPM makes this data universally accessible.

Does this work on mobile devices?

Yes — the converter runs in any web browser, so it works on phones, tablets, laptops, and desktops regardless of operating system.

Does the conversion preserve quality?

The converter retains maximum fidelity during the HRZ to XPM transformation. Any differences stem from the output format's own characteristics.