AFF to HRZ Converter

AFF to HRZ online — free slow-scan TV image format

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SSTV-Ready

AFF to HRZ conversion formats your artwork for slow-scan television. Ready to transmit over amateur radio frequencies.

Remote Processing

Conversion happens on Convertio servers — no special SSTV software needed on your machine.

No Sign-Up

Convert immediately without creating an account. The tool is open and available to everyone.

How to convert AFF 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

AFF (Acorn Draw) is a vector graphics file format native to Acorn Computers' RISC OS operating system, introduced with the Draw application bundled in RISC OS 2 in April 1989. The Draw application shipped as a standard component of every RISC OS installation, providing users with a capable vector illustration tool at no additional cost. AFF files store vector objects as a sequence of tagged data blocks, each containing object type, bounding box, and type-specific data — supported objects include paths with straight lines and Bezier curves, text objects with font references, sprite (bitmap) objects, groups, and tagged objects for application-specific extensions. Path objects use cubic Bezier curves with move, line, and curve elements, supporting variable line widths, join styles, dash patterns, and flat color fills. The coordinate system uses RISC OS draw units at 1/180 inch resolution, providing precision for both screen display and print output. One advantage is the straightforward binary structure — the tagged block architecture makes AFF files simple to parse and generate programmatically. Native operating system integration is another strength: RISC OS renders Draw files natively in its desktop environment, treating vector graphics as first-class objects alongside bitmaps. While Acorn Computers ceased operations in the late 1990s, RISC OS continues under active open-source development, and AFF files remain supported through the platform's drawing applications and conversion utilities.
Developer: Acorn Computers
Initial release: 1989
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

Why convert AFF to HRZ?

AFF requires extinct software to open. HRZ is used in amateur radio SSTV (slow-scan TV) applications — converting makes your artwork transmittable over radio.

What opens HRZ files?

SSTV software like MMSSTV, MultiScan, and various ham radio imaging tools handle HRZ files. Some image viewers also support it.

Is the conversion free?

Yes — free with no account required. Premium plans offer batch conversion for multiple files.

What resolution is HRZ?

HRZ images typically use 256x240 resolution with limited color, optimized for SSTV transmission constraints.

Is my upload kept private?

Your AFF file is deleted after conversion. The HRZ output is removed from servers within 24 hours.