eFax

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File Format
Name EFax
Ontology
Extension(s) .efx

eFax is an internet fax software owned by J2 Global[1]. J2 Global was founded in 1995 as JFAX.com. eFax Messenger is software which can send and receive image files in the proprietary .EFX file format.[2]

Contents

File Identification

J2 Global's original JFAX service used a file format based on the TIFF-F format with a .JFX extension. Also known as J2 Messenger[3].

Version 3 & 4 of the .EFX file format is proprietary and begins with hex values DCFE then 2 bytes of unknown values then 6 bytes 00000000FFFF.

Version 5 is unknown.

Screenshots

EFax-OpenMenu.png

Software

References

  1. https://en.wikipedia.org/wiki/J2_Global
  2. https://www.efax.com/efax-help-center/efax-messenger/viewing-faxes
  3. https://www.jconnect.com/supported-file-types
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