LogFX is a simple Log reader supporting color highlighting and able to handle giant files.
Switch branches/tags
Clone or download
Latest commit e41abec Nov 5, 2017
Failed to load latest commit information.
docs/images Mac and Linux screenshots. Sep 20, 2017
src Fixed #10 close popups with ESC. Nov 5, 2017
.gitignore Initial commit Aug 16, 2015
LICENSE Added GPLv3 License Sep 16, 2017
build.gradle Up version to 0.8.0. Nov 5, 2017
gradlew.bat Upgraded Gradle Aug 19, 2017
release-notes.md Updated release notes. Nov 5, 2017
settings.gradle Initial commit Aug 16, 2015


LogFX Logo


A log viewer capable of reading large files without a performance hit.

It is written in JavaFX so it can run in any Operating System.


  • extremely fast to open and navigate large files.
  • tail file(s) with option to pause at any time.
  • go to date-time in any log file (or all opened files).
  • highlight text using regular expressions rules.
  • highly customizable look via JavaFX CSS (refreshes instantly).
  • keyboard friendly (shortcuts for everything).

Getting LogFX

To get LogFX:

  • click on the Download button near the top of this page, then open the Files tab, choose the logfx-x.x-all.jar file... notice the all qualifier...


  • download the jar from the command-line:
curl -sSfL https://jcenter.bintray.com/com/athaydes/logfx/logfx/0.8.0/logfx-0.8.0-all.jar -o logfx.jar

Size of the jar as of version 0.6.1: 289 KB. Not MB!

Running LogFX

Java 8+ is required to run LogFX

Run it with:

java -jar logfx.jar

If you don't want it to use the default hundreds of MB of RAM, ask java to use at most 50MB and it will run fine:

java -Xmx50m -jar logfx.jar


See screenshots in the Wiki.

System properties

LogFX allows customizing certain behaviours using system properties.

The following properties are currently recognized at startup:

  • logfx.home - home directory (~/.logfx/) by default.
  • logfx.stylesheet.file - custom stylesheet file location.
  • logfx.stylesheet.norefresh - set this to any value to stop LogFX from watching the custom stylesheet file.
  • logfx.log.target - where to send LogFX's own log (file|sysout|syserr).
  • logfx.log.level - log level for LogFX's own log (trace|debug|info|warn|error).

To specify a different home for LogFX (say, /temp/logfx), for example, start LogFX with this command:

java -Dlogfx.home=/temp/logfx -jar logfx.jar

This allows you to store several different LogFX customizations in the same machine.

Specifying a custom stylesheet

Notice that the logfx.stylesheet.file allows you to specify your own stylesheet to customize the looks of LogFX.

The default stylesheet can be found at src/main/resources/css/LogFX.css.

The most interesting element is the .root, which lets you set the theme-colour as well as the UI icons' colours:

.root {
    -fx-base: #1d1d1d;
    -icons-color: rgb(61, 114, 144);

You can also increase the padding between log lines, as another example:

.log-line {
    -fx-padding: 2, 5, 2, 5;

To see some possibilities, check the Screenshots in the Wiki.