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HRZ to KWD Converter

Produce KWD from HRZ — browser-based converter

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Format Flexibility

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

Browser-Based Tool

No downloads or installations needed — open the converter in your browser and convert HRZ to KWD instantly from anywhere.

Data Safety First

All HRZ uploads are removed after processing. Converted KWD output is deleted within 24 hours to protect your information.

How to convert HRZ to KWD

1

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

2

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

3

Let the file convert and you can download your kwd 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
KWD is the native document format of KWord, the word processor component of KOffice (later renamed Calligra Suite), developed by the KDE community with its first stable release in KOffice 1.0 in 2000. KWord distinguished itself from other word processors through a frame-based layout model where text, images, and other content existed in independent frames that could be positioned freely on the page, similar to desktop publishing applications — a departure from the linear text-flow approach used by most word processors. KWD files store document content in a compressed XML format that describes the frame hierarchy, text content with formatting markup, paragraph styles, page dimensions, headers, footers, and embedded media. The format uses a ZIP container packaging the XML document alongside any referenced images and resources. One advantage was the flexible frame-based layout — users could position text and image frames independently on the page, enabling newsletter-style layouts and creative document designs without switching to a dedicated DTP application. The open XML structure is another benefit, making KWD files transparent and accessible to automated processing. KWord was included in several Linux distributions as part of the KDE desktop environment during the 2000s. The project was eventually discontinued in favor of Calligra Words, which adopted the ODF standard. KWD files can be opened with legacy KOffice installations or converted through document conversion tools.
Developer: KDE
Initial release: 2000

Frequently Asked Questions

Why convert HRZ to KWD?

Kde office suite document format — converting HRZ to KWD gives your SSTV images broader reach and easier sharing across standard platforms.

What programs open KWD?

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

Can I batch convert HRZ to KWD?

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

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.

Can I convert on a phone or tablet?

Absolutely — the online converter works in mobile browsers just as well as on desktop. No app installation is required at all.