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HRZ to DBK Converter

Online HRZ to DBK conversion — fast results

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Format Flexibility

HRZ to DBK conversion opens new possibilities. Use your SSTV images in contexts where DBK is the expected or required format.

Batch Processing

Convert multiple HRZ images to DBK in one session. Queue your images and let the converter process them all without manual repetition.

Intuitive Process

No learning curve needed. The HRZ to DBK converter walks you through every step with a clean, self-explanatory interface.

How to convert HRZ to DBK

1

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

2

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

3

Let the file convert and you can download your dbk 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
DBK is a file extension associated with DocBook, a semantic markup language for technical documentation defined in XML (and originally SGML). DocBook was created around 1991 by HaL Computer Systems and O'Reilly & Associates, later maintained by the OASIS DocBook Technical Committee. The vocabulary provides over 400 element types designed specifically for books, articles, reference pages, and technical manuals — including structural elements (book, chapter, section, appendix), block elements (para, programlisting, table, figure), and inline elements (emphasis, filename, command, classname). Authors write content focusing on meaning rather than appearance, and separate stylesheets transform the DocBook source into output formats like HTML, PDF, EPUB, and man pages. One advantage is strict separation of content and presentation — a single DocBook source document can generate a printed book, a website, an ebook, and Unix man pages through different transformation pipelines, without any content duplication. The rich semantic vocabulary is another strength: because elements like <command>, <filename>, and <errorcode> carry precise meaning, toolchains can index, cross-reference, and validate technical content in ways that generic markup cannot. DocBook has been adopted by major open-source projects including the Linux kernel documentation, GNOME, KDE, and FreeBSD for their official documentation, and it remains the standard for single-source technical publishing.
Initial release: 1991

Frequently Asked Questions

Why convert HRZ to DBK?

Semantic markup for technical documentation — converting HRZ to DBK gives your SSTV images broader reach and easier sharing across standard platforms.

What programs open DBK?

DBK works with major office apps including Microsoft Office, LibreOffice, and online editors like Google Docs.

Do I need HRZ software installed?

No — the converter processes HRZ entirely in the cloud. You do not need any amateur radio slow-scan television software on your device to convert.

Is the output quality comparable?

The conversion extracts the best possible quality from your HRZ data. The DBK output reflects the format's capabilities accurately.

Is batch HRZ to DBK conversion supported?

Absolutely — queue multiple HRZ images and convert them all to DBK in a single session. No need to process one at a time.

How long does the conversion take?

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