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Log Parser & Analyzer

Parse and analyze log files with auto-format detection, structured table output, level filtering, and search.

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Log Input
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Drop log file here or click to browse
Supports .log and .txt files (up to 50MB)

What is Log Parser & Analyzer?

Log Parser & Analyzer is a free online tool that parses and analyzes log files from various sources. It auto-detects common log formats including JSON Lines, Apache/Nginx combined, Syslog, and generic level-keyword logs. The tool extracts structured data into a searchable, filterable table with color-coded severity levels, making it easy to diagnose issues and spot patterns in your log data.

Common Use Cases

Server Debugging

Parse Apache, Nginx, or application server logs to quickly identify errors and warnings causing issues in production.

Application Monitoring

Analyze JSON-structured application logs to track error rates, identify recurring issues, and monitor service health.

Security Analysis

Filter and search through system logs to identify suspicious activity, failed login attempts, or unauthorized access patterns.

Performance Investigation

Parse log files to find slow requests, timeout errors, and performance bottlenecks across your application stack.

How to Use This Tool

  1. Paste log content into the text area or upload a .log/.txt file
  2. The tool auto-detects the log format and displays a format badge
  3. Review the stats section for a breakdown of log levels
  4. Use the level toggle buttons to filter by severity (ERROR, WARN, INFO, etc.)
  5. Search for specific text across timestamps, sources, and messages

Frequently Asked Questions

What log formats are supported?
The tool auto-detects JSON Lines (structured JSON logs), Apache/Nginx combined access logs, Syslog format, and generic logs with level keywords like ERROR, WARN, INFO, DEBUG, TRACE, and FATAL.
Can I upload large log files?
Yes! The tool supports files up to 50MB and uses pagination (500 rows at a time) to keep the interface responsive even with very large log files.
Is my log data secure?
Absolutely. All parsing happens locally in your browser. Your log data is never uploaded to any server, making it safe for sensitive production logs.
How does format auto-detection work?
The tool samples the first 5 non-empty lines and tests them against each parser in order: JSON Lines, Apache/Nginx, Syslog, then generic level keywords. The first format that matches a majority of sample lines is selected.

Related Tools

JSON Formatter →

Learn More

Log Parser & Analyzer is a free online tool that requires no signup or installation. It works directly in your browser, keeping your data private and secure.