LOG File Viewer
Open any .log file instantly in your browser — view line numbers, filter by keyword, and highlight errors without installing anything.
Log files are essential for debugging servers, apps, and scripts — but most tools for reading them require software installs or command-line access. Flipper File's LOG File Viewer lets you open any .log file directly in your browser, with line numbers, keyword filtering, and instant error highlighting. Nothing leaves your device, no login required.
How to View a LOG File Online
- Click Choose File (or drag and drop your
.logfile into the upload area). - The file loads instantly with full line numbers displayed.
- Use the Filter / Search box to jump to lines matching a keyword (e.g. "ERROR", "WARN", "404").
- Toggle Highlight Errors to automatically color-code ERROR, WARN, FATAL, and INFO lines.
- Use the Jump to End button to skip straight to the most recent log entries.
Why Use Flipper File to View LOG Files?
- Runs entirely in your browser — log files never leave your device or touch a server.
- Line numbers included — every line is numbered so you can reference specific entries easily.
- Instant keyword filtering — type any term and see only matching lines in real time.
- Auto error highlighting — ERROR, WARN, FATAL, DEBUG, and INFO lines each get a distinct color.
- Jump to End — skip to the bottom of massive log files with one click.
- Handles large files — optimized for logs up to 50 MB without freezing the browser.
- No installation, no login — works on any device with a modern browser.
Frequently Asked Questions
What is a .log file?
A .log file is a plain-text file that records events, errors, and activity from an application, server, or system. They're used by web servers (like Apache and Nginx), databases, operating systems, and virtually every piece of software to track what happened and when.
Can I view server logs like Apache or Nginx logs?
Yes. Flipper File's LOG File Viewer works with any plain-text log format, including Apache access logs, Nginx error logs, PHP error logs, MySQL logs, Windows Event exports, and application logs from Node, Python, Java, and more.
Does my log file get uploaded to your server?
No. All processing happens entirely in your browser using JavaScript. Your log file is read locally — it never leaves your device and is never sent to any server.
What's the maximum file size I can view?
The viewer handles files up to approximately 50 MB efficiently. Larger files may still load but could slow down the browser depending on your device's memory.
Can I search for specific errors or keywords?
Yes. Use the Filter / Search box to type any keyword, and the viewer will instantly show only the lines that contain that term. This is especially useful for filtering to "ERROR", "WARN", or specific IP addresses in access logs.
What do the color highlights mean?
When error highlighting is enabled, lines are color-coded by severity: ERROR and FATAL lines appear in red, WARN lines in orange/yellow, INFO lines in blue, and DEBUG lines in gray. Lines with no recognized keyword stay in the default style.
Can I view logs from Windows, Linux, or Mac?
Yes. LOG files from any operating system are plain text and work the same way in the viewer. Whether you're looking at a Windows IIS log, a Linux cron log, or a macOS Console export, just open it and go.
Do I need any software or extensions installed?
No. The tool runs entirely in your web browser. No downloads, no plugins, no extensions — just open the page and drop your file in.