jLog is a modern Logging program for Hams that can run on all major platforms, e.g. macOS, Linux, Windows, etc. It offers a nice, clean interface and allows efficient entry of QSOs.

It is available for free so you can afford to try it!

You won't get stuck with jLog. Import or Export of data using the standardized ADIF 3 formats are possible to easily exchange data with any other decent Log program.

Key features

The simplicity of use, consistant across platforms is followed by many functional advantages, such as

  • Real-time integrations

    Real-time integration with WSJT-X for logging and lookup with QRZ and HamQTH

  • Efficient Internet lookups

    QRZ, HamQTH and US FCC lookups. Real-time logging with eQSL and LoTW.

  • Many QTHs in a single log

    Keep track of QTHs, rigs, etc. and the TQSL Locations and eQSL Nicknames.

  • Powerful QSL tracking

    Separate tracking of Paper, eQSL and LoTW QSL status.

  • Fast searches

    Search a huge log in less than a second.

  • Updated Award Status

    Automatic Award status and Reports, e.g. "WAS"-type for 28 countries.

Key characteristics

The Main Window is always present and contains essential information in a single view, i.e, without pop-ups or page shifts. Three key components of jLog are introduced below.

The Main Window

A Botton Bar at the top with frequently used buttons.

Then the Main Window with the Log overview. Navigate up/down using the Up/Down-keys. Open a selected entry by pushing the Space Bar.

A continuously updated Status Window below, updated as the different rows of the Main Window are selected.

The Previous Field below is also continuously updated and is showing either previous contacts with the same station or the same country (selectable).

                Main window

The Entry window

The Entry window allows entry of new QSOs and display or modification of existing QSOs. The macOS Look and Feel is shown but the look is very similar on Linux and Windows.

For new QSOs, time, frequency and mode is automatically updated from the radio if "Auto" is active. Push the "Start" button to set the current computer time into the start time field. Push the "End" button to set the current computer time into the end time field. Push "Ref" to manually update the detailed frequency field on the 2nd line in the rightmost position.

Note that the fields that are updated automatically are not changeable unlessthe "Auto" checkbox is unchecked. Power and Location are also considered to not need frequent updating (can be set using the Preset command).

              Entry window

The Profile

The Profile is where all settings or preferences are kept.

Configurations are typically used to reflect alternative QTHs, but can be used to reflect e.g. guest Operators or Rigs (in case multiple rigs can be used for a given frequency or mode). These parameters can be closely linked to the TQSL 'Locations' and 'eQSL 'Nicknames'.

Other settings are typical favourite settings, eQSL and LoTW setting, and DX Clusters or Spots settings.

The Radio setup allows for radios connected via traditional physical serial ports as well as TCP/IP ports, e.g. as used by Flexradio's SmartSDR.

jLog Entry window


Stay updated regarding new releases or other critical information by following @jlogorg on Twitter. See recent tweets below:

Download jLog

jLog is installed and later updated by downloading a single installer file

New jLog V6.7.3.1 available

Prior to jLog V 6.7, a Java Runtime Environment had to be installed before installing jLog. This is no longer necessary.

Although the jLog application is the same for any platform, separate installers are available for each major platform to simplify the installation task. The optional serial port used for CAT control and keyer control may require platform specific drivers.

Please do remember to regularly check for updates. Errors are being fixed and new functionality may be added.

Go to the installer page for your platform,

Older versions of jLog

Older versions (prior to V 6.7) are available on the old jLog Website

Interested in propagations?: Solar Cycle 25 Sunspot Number Trend


Please feel free to contact jLog Support (mail@jlog.org) for:

  • reporting bugs or potential bugs
  • suggesting improved/new functionality
  • some assistanse with application installation, Log conversion, etc.



jLog is Copyright © 2001 – 2022 LA3HM Arve Olaussen. All Rights Reserved.

jLog can be freely distributed and installed for non-commercial use by licensed Radio Amateurs. However, you must not distribute copies of your personal Registration Code.

The jLog Author takes no responsibility for possible loss of data. Make frequent backup copies of your work, preferably to another disk (or at least disk area). Report any problems to mail@jlog.org.

PureJavaComm radio interface

jLog V5 and newer uses PureJavaComm. No changes has been made to the standard distribution.

Copyright (c) 2011, Kustaa Nyholm / SpareTimeLabs under Simplified BSD License. All rights reserved.

The Simplified BSD License conditions are available here: Simplified BSD License

Java Runtime Environment (JRE) and Installers

OpenJDK 17 JRE is Copyright (c) 1995, 2012, Oracle and/or its affiliates. All rights reserved. Distribution licensed under GNU GPL V2 with the Classpath Exception.

The GNU General Public License V2 conditions are available here: GNU GPL V2 with the Classpath Exception


Policy statement

The purpose of this web-site is solely to provide information about jLog and to allow potential users to download the jLog application. No user information is collected and such information can therefore not be stored nor transferred to any third parties.


Any changes to this policy will be posted as updates to this statement.


Please contact the author by e-mail to mail@jlog.org if you have any questions.