HEIF to HRZ Converter

Easily convert HEIF to HRZ — works in any browser

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Universal Access

Platform-independent conversion — process HEIF to HRZ on any operating system or device through your web browser, without plugins or installs.

Data Protection

Privacy is a priority. Your HEIF is removed from servers immediately after conversion, and the HRZ download is automatically deleted within 24 hours.

Remote Processing

The HEIF to HRZ conversion runs entirely on cloud servers — your computer stays fast and responsive while the heavy processing happens remotely.

How to convert HEIF 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

HEIF (High Efficiency Image File Format) is a container format for images and image sequences standardized by the Moving Picture Experts Group as ISO/IEC 23008-12, first published in 2015. HEIF is built on the ISO Base Media File Format (ISOBMFF, the same container used for MP4 video), providing a flexible structure that can hold single images, image collections, image sequences (like animations or bursts), and derived images with non-destructive editing operations. The container is codec-agnostic — while the most common implementation pairs HEIF with HEVC/H.265 compression (branded as HEIC by Apple), the standard also accommodates AV1 compression (creating the AVIF variant), H.266/VVC, and other future codecs. HEIF supports features that JPEG lacks: 10-bit and 12-bit color depth, wide color gamuts (Display P3, BT.2020), lossless compression, alpha transparency, depth maps, thumbnail images, and Exif/XMP metadata — all within a single file. Auxiliary image items can store computational photography data like depth maps, HDR gain maps, and semantic segmentation masks. One advantage is the format's future-proof architecture: by separating the container from the codec, HEIF can adopt newer, more efficient compression technologies without changing the file structure, metadata handling, or application-level APIs. The substantial compression improvement over JPEG is another core strength — HEVC-based HEIF typically achieves 40-50% file size reduction compared to JPEG at the same visual quality, beneficial for storage and bandwidth. HEIF is supported by Apple's ecosystem (iOS, macOS), Windows 10/11, Android 10+, GIMP, ImageMagick, and Adobe products.
Initial release: 2015
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

What are the reasons to convert HEIF to HRZ?

HEIF's modern compression isn't recognized by every application — transforming to HRZ trades cutting-edge efficiency for guaranteed compatibility.

How do I open a HRZ file?

Open HRZ files using slow-scan television software, IrfanView, and XnView.

How fast is the HEIF to HRZ conversion?

Conversion typically takes just a few seconds — HEIF images are processed on powerful servers and the HRZ output is ready almost immediately.

Does converting HEIF to HRZ affect quality?

Your HEIF image data is processed carefully during conversion. The resulting HRZ retains the maximum quality the target format can support.

Is HEIF to HRZ conversion free?

Converting HEIF to HRZ is free at Convertio. For heavier workloads or extra features, paid plans provide additional capacity.

Is my HEIF file safe during conversion?

Yes — uploaded HEIF files are deleted immediately after conversion, and the HRZ output is removed from servers within 24 hours for your privacy.