HRZ to XWD Converter

Get XWD output from your HRZ data in seconds

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Privacy Protected

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

Quick Results

HRZ to XWD conversion is fast — upload, process, and download typically wraps up in under a minute for standard images.

Quality Preserved

The converter extracts the best visual data from your HRZ source. The resulting XWD output maintains the quality your original data supports.

How to convert HRZ to XWD

1

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

2

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

3

Let the file convert and you can download your xwd 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
XWD (X Window Dump) is a screen capture image format defined as part of the X Window System by the MIT X Consortium, dating to approximately 1987. The xwd command-line utility captures the contents of an X window or the entire screen and saves it as an XWD file — functionally equivalent to a screenshot utility but predating the concept by years. XWD files contain a detailed header specifying the X server's visual type, bit depth, byte order, bitmap unit and padding, the window's dimensions, border width, and color map information, followed by the raw pixel data exactly as represented in the X server's framebuffer. This means XWD files faithfully capture the exact pixel representation used by the display hardware — including server-specific byte ordering, padding, and color organization — making them primarily useful on the system where they were captured or on systems with compatible display configurations. The header also stores the window name string and the full color map entries for indexed-color visuals. XWD supports all X11 visual types: StaticGray, GrayScale, StaticColor, PseudoColor, TrueColor, and DirectColor, at any bit depth supported by the X server. One advantage is exact framebuffer fidelity: XWD captures the window's pixel data in its native format without any color space conversion or compression, making it the definitive record of what the X server was actually displaying. The format's integration with the X11 command-line toolkit provides another practical benefit — xwd can capture specific windows by ID or name, be triggered remotely via SSH, and piped directly to format converters. XWD files are handled by ImageMagick, GIMP, xwud (the viewer companion to xwd), and xv.
Developer: MIT X Consortium
Initial release: 1987

Frequently Asked Questions

Why convert HRZ to XWD?

X window system screen capture format — converting HRZ to XWD gives your SSTV images broader reach and easier sharing across standard platforms.

What programs open XWD?

Most image viewers and editors handle XWD — Photoshop, GIMP, IrfanView, and built-in viewers on Windows, macOS, and Linux.

Can I batch convert HRZ to XWD?

Yes — Convertio supports batch uploads. Add multiple HRZ images and convert them all to XWD at once to speed up your workflow.

Will my image lose quality?

Quality depends on the target format. XWD screen capture output preserves data within its format constraints — no unnecessary degradation occurs.

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.

How long does the conversion take?

Most HRZ to XWD conversions finish within seconds. Larger or more complex images may take slightly longer depending on the data size.