HRZ to EXR Converter

Create EXR from HRZ with one click online

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Fast Turnaround

Most HRZ to EXR conversions complete in seconds. Cloud infrastructure handles the processing quickly so you spend less time waiting.

Format Flexibility

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

Privacy Protected

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

How to convert HRZ to EXR

1

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

2

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

3

Let the file convert and you can download your exr 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
EXR is a high-dynamic-range raster image format developed by Industrial Light & Magic (ILM) internally since 1999 and publicly released as open-source software in January 2003. OpenEXR was created to meet the demanding requirements of feature film visual effects compositing, where scenes routinely contain extreme brightness ranges — from deep shadows to specular highlights on water, metal, or light sources — that exceed the precision of 8-bit or 16-bit integer formats. EXR stores pixel data in 16-bit floating-point (half) or 32-bit floating-point per channel, providing over 30 stops of dynamic range with smooth precision across the entire luminance spectrum. The format supports an arbitrary number of channels (not just RGBA), tiled and scanline storage, multiple compression methods (lossless ZIP, lossy B44 and DWAA/DWAB for preview quality), multi-part files containing multiple views or layers, and deep pixel data where each pixel stores multiple depth-sorted samples for volumetric effects. One advantage is compositing fidelity: the floating-point precision means that color grading, exposure adjustments, lighting changes, and multi-layer compositing operations produce mathematically correct results without the banding, clipping, or quantization artifacts inherent in integer formats. EXR's adoption as the VFX industry standard is another core strength — it is the default interchange format for Foundry Nuke, Autodesk Flame, Blackmagic Fusion, Adobe After Effects, and every major 3D renderer, and its open-source C++ library is embedded in hundreds of production tools.
Initial release: January 2003

Frequently Asked Questions

Why convert HRZ to EXR?

Most people lack software for HRZ. Converting to EXR ensures your SSTV images are viewable everywhere — from phones to desktops.

What programs open EXR?

Open EXR with standard tools like Windows Photos, Preview on macOS, GIMP, Photoshop, or any web browser — no special software needed.

Does the conversion preserve quality?

The converter retains maximum fidelity during the HRZ to EXR transformation. Any differences stem from the output format's own characteristics.

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 multiple HRZ images at once?

Yes — upload several HRZ images in one session and convert them all to EXR simultaneously. Batch processing saves significant time.

Is the conversion instant?

Near-instant for typical images — the cloud-based processing handles HRZ to EXR conversion quickly. Very large data may take a moment.