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Fldigi 3.20.29

A multi-platform software for radio amateurs

Free Download

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Fldigi screenshotFldigi stands from "Fast Light Digital Modem Application" and is a multi-platform modem utility that is capable of supporting the majority of digital modes used by radio amateurs nowadays. The application supports MFSK, RTTY, CW, PSK, Olivia, Hell, DominoEX, and Throb.

You can also use Fldigi to perform several frequency measurement tests and calibrate your sound card to a certain time signal.

Fldigi was designed for users who are passionate about radio signals and are willing to learn more and to broaden their experience. The application is not difficult to use, but some technical skills in this domain are required.


  • The interface is clean and simple.
  • Supports all the popular digital modes used by radio amateurs.


  • A certain level of experience is required to use the program at its full potential.
  • The application doesn't have FSK (frequency-shift keying) capabilities.
Name Fldigi
Version 3.20.29
Developer | see all products from this developer
Product Homepage Fldigi
License Free (Freeware)
Last Week Downloads 8
All Time Downloads 2,776
Filesize 3MB
OS Support Win 8.1/Vista/XP/8/7
Category Utilities

100% CLEAN Certification

BadgeFldigi has been tested by team against viruses, spyware, adware, trojan, backdoors and was found to be 100% clean. Our editors will recheck this software periodically to assure that it remains clean.


Old Versions

Software Date Added
Fldigi 3.22.13 July 28, 2015 - Latest Version
Fldigi 3.20.29 November 12, 2010

Download the free Fldigi