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Convert HDR to TXT - Extract Image Metadata and Technical Data

Extract readable metadata from Radiance HDR images. Document your high dynamic range files.

Step 1: Upload your files

You can also Drag and drop files.

Step 2: Choose format
Step 3: Convert files

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Need Technical Details from HDR Files?

Radiance HDR files contain more than just pixel data. These high dynamic range images store valuable metadata including color space information, resolution data, and rendering parameters that document how the image was created.

Converting HDR to TXT extracts this embedded information into a readable text format. This is useful for archivists, 3D artists, and anyone who needs to document HDR image properties without specialized software.

How to Convert HDR to TXT

  1. Upload your HDR file - Drag and drop your Radiance .hdr or .pic file
  2. Confirm TXT output - Select TXT as your target format
  3. Download your text file - Get the extracted metadata as plain text

The conversion runs in your browser. No software installation required, works on any device.

What Gets Extracted

HDR files contain a structured header with technical information. In our testing, the extracted text typically includes:

  • Format signature - Confirms the file is valid Radiance RGBE format
  • Resolution data - Image dimensions and orientation
  • Color primaries - CIE chromaticity coordinates for RGB channels
  • Exposure values - Any stored exposure compensation data
  • Software info - Program that created the HDR file

The exact metadata depends on what was embedded when the HDR file was created.

Common Use Cases

Asset Documentation

Game developers and 3D artists often maintain libraries of HDR environment maps. Extracting metadata to TXT creates searchable documentation without opening each file in specialized software.

Archival Records

Digital preservation workflows require documenting file properties. TXT extracts provide human-readable records that can be stored alongside the original HDR files.

Quality Control

When receiving HDR files from external sources, a quick text extraction reveals technical specifications without loading the full image in editing software.

HDR vs TXT: Format Comparison

AspectHDRTXT
PurposeHigh dynamic range image storagePlain text data
File sizeLarger (pixel data + metadata)Very small (text only)
CompatibilityRequires HDR-capable softwareOpens anywhere
Visual dataFull image preservedNone (metadata only)
EditabilitySpecialized editors neededAny text editor

TXT extraction is for documentation purposes. If you need the actual image converted, consider HDR to JPG or HDR to PNG instead.

When to Use a Different Format

HDR to TXT is specifically for metadata extraction. For other needs:

  • Need the image viewable? - Convert to JPG or PNG instead
  • Need structured data? - Consider HDR to XML for machine-readable output
  • Need a document? - HDR to PDF preserves formatting better

TXT is best when you want simple, universal text output with no formatting overhead.

Pro Tip

HDR files store chromaticity information in their headers that defines the exact color primaries used. This data is essential for proper color management when the image moves between different rendering pipelines.

Common Mistake

Expecting the TXT output to contain viewable image data. HDR to TXT extracts metadata only. For a viewable image, convert to JPG or PNG instead.

Best For

Asset managers who need to catalog large HDR libraries without opening each file, or archivists documenting digital preservation collections.

Not Recommended

Not useful if you need the actual image content. TXT extraction provides technical metadata only, not visual data or any representation of the image itself.

Frequently Asked Questions

HDR (Radiance RGBE) is a high dynamic range image format created for the Radiance rendering system. It stores pixel data with greater precision than standard image formats, using a shared exponent encoding that captures a wider range of light intensities.

HDR files typically contain resolution data, color space information (CIE chromaticity coordinates), exposure values, software information, and format signatures. The exact metadata depends on what the creating application embedded.

No. This conversion extracts the embedded metadata and technical information, not the visual pixel data. You get a text file with file properties, not an ASCII art version of the image.

HDR files are created by 3D rendering software like Radiance, Blender, and Maya. They're also produced by HDR photography software that merges multiple exposures, and by environment map generators for game development.

No. The TXT extraction contains only metadata, not the pixel data needed to reconstruct the image. Always keep your original HDR files if you need the visual content.

Text extraction is useful for documentation, archival records, asset management databases, and quality control checks. It lets you search and catalog HDR file properties without specialized image software.

Yes. The HDR to TXT converter is completely free with no registration required. Upload your file, convert, and download the text output.

The converter accepts .hdr, .pic, and .rgbe file extensions. These are all variations of the Radiance RGBE format and contain the same type of data structure.

The conversion processes in your browser using client-side technology. Your HDR files stay on your device and aren't uploaded to external servers.

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