MMegaConvert

Convert HDR to AVIF

Free online HDR to AVIF converter. No signup required.

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Max file size: 100 MB

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How to Convert HDR to AVIF

Follow these simple steps to convert your file in seconds.

  1. 1

    Upload your .hdr file

    Drag and drop your .hdr file into the upload area, or click "Browse" to select it from your device. Your file is uploaded securely and processed on our servers.

  2. 2

    Click "Convert to AVIF"

    Once your file is uploaded, press the convert button to start the HDR to AVIF conversion process.

  3. 3

    Wait for the conversion to complete

    The conversion usually takes just a few seconds. You can see the progress in real time while your file is being processed.

  4. 4

    Download your converted .avif file

    When the conversion is finished, click the download button to save your new .avif file. The file is ready to use immediately.

Understanding HDR and AVIF Formats

Learn about the source and target file formats to understand what happens during conversion.

Source Format

Radiance HDR Image

image/vnd.radiance

HDR (High Dynamic Range) Radiance format, also known as RGBE, stores images with a high dynamic range of luminance values using a run-length encoded format. Developed by Greg Ward for the Radiance lighting simulation system, it encodes each pixel as three 8-bit mantissas and a shared 8-bit exponent. HDR images capture a much wider range of brightness than standard 8-bit formats.

Advantages

  • Captures a wide dynamic range of lighting from very dark to very bright
  • Relatively compact encoding for high dynamic range data
  • Widely supported in 3D rendering, game engines, and compositing software

Limitations

  • Lower precision than 32-bit EXR for demanding visual effects work
  • Not suitable for direct display without tone mapping
  • Limited to RGB data with no alpha channel support

Common Uses

  • Environment maps and image-based lighting in 3D rendering
  • HDR photography merging and tone mapping workflows
  • Lighting simulation and architectural visualization

Target Format

AVIF Image

image/avif

AVIF (AV1 Image File Format) is a modern image format based on the AV1 video codec, offering significantly better compression than JPEG and WebP. It supports both lossy and lossless compression, HDR, wide color gamut, alpha transparency, and animated sequences. AVIF is developed as a royalty-free open standard by the Alliance for Open Media.

Advantages

  • Superior compression efficiency, often 50% smaller than JPEG at equivalent quality
  • Supports HDR, wide color gamut (10-bit and 12-bit), and alpha transparency
  • Royalty-free and open standard with growing browser support

Limitations

  • Encoding is significantly slower than JPEG or WebP
  • Not yet universally supported in all browsers and image editors
  • Maximum image dimension limitations in some implementations

Common Uses

  • Next-generation web image optimization for bandwidth savings
  • High-quality HDR image delivery on supporting platforms
  • Progressive replacement for JPEG and WebP in web applications

Frequently Asked Questions

Common questions about converting HDR to AVIF.

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