We have all opened a 300 MB log in Notepad and watched it freeze. Then came the scrolling, the Ctrl+F, and the moment you realise the error you need is 40,000 lines above the one you are looking at. LogExpert exists for exactly that job. It is a Windows log viewer and a graphical version of tail -f: it follows files as they grow, and it lets you filter, highlight, bookmark and split lines into columns without loading everything into memory.
The original project lived on CodePlex. Today it is maintained by the LogExperts team on GitHub and gets frequent releases. The current version is LogExpert 1.50.0 (October 2026). It is free and open source.
LogExpert at a glance
| Latest version | 1.50.0, released 3 October 2026 |
|---|---|
| Licence | Free, open source |
| Platform | Windows 10 and 11 |
| Requirements | .NET Desktop Runtime (.NET 10 for current versions) |
| Other install options | Chocolatey: choco install logexpert |
| Developer | LogExperts community (open-source project on GitHub) |
What you get
- Tail mode. Open a log and it keeps scrolling as new lines arrive, like
tail -fon Linux. - Tabs. Several logs in one window, and you can merge rolling files (app.log, app.log.1, app.log.2) into a single view.
- Search with regular expressions, plus a separate filter view that shows only the matching lines. A filter result can be sent to its own tab.
- Highlighting. Colour lines by keyword or RegEx, for example red for
ERRORand yellow forWARN. - Triggers. A matching line can set a bookmark automatically or call a plugin.
- Bookmarks to jump between interesting places in a huge file.
- Columnizers. Plugins that split a line into columns (date, level, thread, message). There are built-in ones for common formats, log4j XML and Serilog compact JSON.
- SFTP plugin to open logs directly from a Linux server.
- Portable mode. All settings are stored next to the program, handy for a USB stick or a jump host.
- Light, dark or system colour mode (new in 1.43.0).
Download and install
- Click the Download button at the top of this page and save the ZIP archive.
- Unpack it to any folder and run
LogExpert.exe. No installation is required; settings are stored next to the program. - If the program does not start, install the .NET Desktop Runtime from Microsoft (recent LogExpert versions need .NET 10; older builds ran on the .NET Framework that ships with Windows).
- Administrators who deploy software with Chocolatey can also use
choco install logexpert.
Practical tasks
Follow a live application log
Open the file, make sure Follow tail is on, and add a highlight rule for ERROR|FATAL. New errors appear in red at the bottom as they happen, and you can leave the window open on a second monitor during a deployment.
Find everything for one request or user
Open the filter panel, enter the request ID or user name, and send the result to a new tab. You now have a clean list of 50 relevant lines instead of 2 million, and each line still links back to its place in the full log.
Jump straight to a line from another tool
Since version 1.50.0 (October 2026) you can start LogExpert at a specific line:
LogExpert.exe "C:logsapplication.log" --line 1234
This is useful from scripts, monitoring alerts or an IDE. If the file is already open, the existing window is reused.
Read logs as a table
Pick a columnizer for the file (or let LogExpert guess it from the file name and content). Timestamps, severity and message become separate columns, so you can sort and scan much faster than in plain text.
Where it fits, and where it does not
LogExpert is a desk tool for one engineer looking at files. It is not a log management system: there is no central collection, no retention, no dashboards and no alerting to Slack. If you need that across dozens of servers, look at Graylog, Grafana Loki or the ELK stack, and keep LogExpert for quick local investigation.
Common problems and fixes
| Problem | What to do |
|---|---|
| Nothing happens when you start it | Install the .NET Desktop Runtime (not only the ASP.NET or Console runtime). |
| Portable copy keeps asking the same questions or writes to AppData | Fixed in 1.42.0; update. |
| Session opens with missing tabs | Fixed in 1.40.4 and improved again in 1.43.0 (session file list is recovered from the tab layout). |
| Follow tail stops after an update | A setup packaging bug in 1.40.4 was fixed in 1.40.5; reinstall the current version. |
| Lines are not split into columns | Select the right columnizer manually via the context menu; automatic detection is still experimental. |
LogExpert vs. alternatives
| Tool | Strength | Compared to LogExpert |
|---|---|---|
| BareTail | Very small, simple tail | Free version has no filtering or columns |
| Notepad++ with plugins | Already installed on many PCs | Struggles with very large files, no live tail by default |
| Klogg / glogg | Fast search in huge files, cross-platform | No columnizers or triggers |
| Microsoft CMTrace | SCCM / Intune logs | Built for one log format |
FAQ
Is LogExpert free?
Yes, it is free and open source with no paid edition.
Does LogExpert run on Linux or macOS?
No, it is a Windows application built on .NET. On Linux, tail -f, less +F or Klogg are the usual choices.
Can it open very large files?
Yes. It reads files in blocks instead of loading them completely, so multi-gigabyte logs open without freezing the PC.
Is there a portable version?
Yes. Unpack the archive and run it; settings are saved in the program folder.
Why did the version jump from 1.9 to 1.4x?
Version 1.9 was the last release of the original project. The community fork on GitHub continued development and now publishes new versions almost every month.
Can it read logs on a remote server?
Yes, by opening a network share path, or with the SFTP file system plugin in current versions.
Where is the official LogExpert website?
LogExpert is developed in the open on GitHub by the LogExperts community — releases, the changelog and the issue tracker live there. The original CodePlex site no longer exists.
What is the best alternative to LogExpert?
For a tiny, no-frills tail, BareTail. For fast searching in multi-gigabyte files on Windows, macOS or Linux, Klogg. For SCCM and Intune logs specifically, Microsoft CMTrace. None of them has LogExpert’s columnizers and triggers.
