FAX to HDR — Format Comparison & Online Converter
Fast, instant FAX to HDR conversion. No signup required. Just drop your .fax file and get .hdr in seconds.
Batch Settings
About FAX to HDR Conversion
FAX and HDR (introduced 1985) are both image formats, but they differ in important ways. FAX is a widely used file format. HDR (Radiance) is a high-dynamic-range image format used in lighting and rendering.
When you convert FAX to HDR, the goal is to convert between formats quickly. Converting FAX to HDR maintains high quality with CocoConvert's optimised encoder settings. Understanding these technical differences helps you choose the right format for your workflow.
Your FAX file is decoded and re-encoded as HDR. The conversion involves 4 steps: (1) your fax file is uploaded and validated, (2) the file is decoded (parsed into its raw data), (3) the data is re-encoded in hdr format, (4) the converted file is ready for download.
CocoConvert's converter handles the entire pipeline server-side using FFmpeg, Sharp, and qpdf — battle-tested libraries used by streaming platforms and enterprise tools. Files are encrypted in transit and deleted within 24 hours.
This conversion is ideal when you When you need a HDR file. For the opposite direction, CocoConvert also supports HDR to FAX conversion.
How to Convert FAX to HDR
- 1
Upload .fax file
Select your FAX file by dragging it to the upload zone or using the file picker. Batch upload is available for multiple files.
- 2
Choose .hdr
Set HDR as the output format. The converter uses optimal settings based on the FAX→HDR conversion profile.
- 3
Convert
The server-side engine decodes your FAX file and re-encodes it as HDR. Processing time depends on file size and complexity.
- 4
Download result
Grab your converted .hdr file. Multiple output files can be downloaded together.
What Happens When You Convert FAX to HDR
Your FAX file is decoded and re-encoded as HDR.
Your FAX file is uploaded and validated
The file is decoded (parsed into its raw data)
The data is re-encoded in HDR format
The converted file is ready for download
Format Comparison
FAX
.fax file
| Extension | .fax |
| MIME Type | image/g3fax |
| Category | Image |
HDR
.hdr file
| Extension | .hdr |
| MIME Type | image/vnd.radiance |
| Category | Image |
Should You Convert FAX to HDR?
When to Convert
- ✓When you need a HDR file
Frequently Asked Questions
What is the difference between FAX and HDR?
FAX is a widely used file format. HDR (Radiance) is a high-dynamic-range image format used in lighting and rendering.
Does FAX to HDR conversion affect quality?
Converting FAX to HDR maintains high quality with CocoConvert's optimised encoder settings.
Which format has better compression, FAX or HDR?
FAX is a common image format. HDR uses lossless compression. The better choice depends on whether you prioritize file size or quality.
How long does FAX to HDR conversion take?
Most conversions finish in seconds. Larger files or complex image content may take 10–30 seconds. CocoConvert processes files in parallel for batch jobs.
Is FAX or HDR better for long-term storage?
HDR is better for archival since it preserves all original data.
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