DBK to HRZ Converter

Turn DBK files into HRZ online — quick and free

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Reliable Output

Expect accurate DBK to HRZ conversion that preserves document structure, headings, and content as faithfully as possible.

Simple Interface

Converting DBK to HRZ takes three steps — upload, choose format, download. No learning curve or technical knowledge needed.

Structure Retained

DocBook markup is carefully mapped to HRZ output — headings, paragraphs, and lists carry over where the format allows.

How to convert DBK to HRZ

1

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

2

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

3

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

About formats

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
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

Frequently Asked Questions

When should I convert DBK to HRZ?

When you need a visual representation of your DocBook content — for slides, previews, or social sharing.

What program opens HRZ files?

Most image viewers, web browsers, and graphics editors — such as Photoshop, GIMP, and Preview — open HRZ files.

Does the conversion preserve page layout?

The converter renders your DocBook content as HRZ images, capturing the visual layout of each page faithfully.

Is DBK to HRZ conversion free?

Yes — Convertio offers free DBK to HRZ conversion. Premium plans are available for heavier workloads and larger files.

Can I convert multiple DBK files to HRZ?

Yes — upload several DBK files at once and batch-convert them all to HRZ in a single session.

Does converting DBK to HRZ require registration?

No signup is needed. Open the converter page, upload your DBK file, and get your HRZ output right away.