Log Analyzer
Filter and analyze logs with intelligent pattern detection
Free Online Log File Analyzer & Viewer
Analyze log files online without installing anything. Paste or upload web server access logs, application logs, or container output and the analyzer parses each line, detects log levels, and gives you instant filtering and search. It understands JSON logs, Apache and Nginx access logs, syslog, and plain text — so you can go from a raw log dump to the failing request in seconds.
Key Features
- Parse Apache and Nginx access logs, syslog, JSON logs, and plain text
- Automatic log level detection with ERROR, WARN, INFO, and DEBUG filtering
- Full-text search across thousands of log lines instantly
- Pretty-printed JSON log lines from Node.js, Docker, and Kubernetes
- Timeline view to spot error spikes and patterns
- Export filtered results to JSON, CSV, or plain text
- Free online log analyzer with no sign-up and no file size anxiety
Common Use Cases
- Finding the root cause of a production error in application logs
- Analyzing web server access logs for failed requests and status code spikes
- Reviewing Nginx or Apache logs after a deployment
- Reading JSON logs from Docker containers or Kubernetes pods
- Filtering noisy DEBUG output down to warnings and errors
- Sharing a filtered slice of a log file with a teammate
Frequently Asked Questions
How do I analyze log files online?
Paste or upload your log file into the analyzer. The tool parses structured and unstructured logs, highlights error and warning lines, and lets you filter and search across thousands of entries instantly.
Can I filter logs by log level online?
Yes. The analyzer detects log levels (ERROR, WARN, INFO, DEBUG) and lets you filter to show only the levels you need. Color coding makes critical errors easy to spot at a glance.
Does the log analyzer support JSON logs?
Yes. JSON-formatted log lines are detected automatically and pretty-printed in a structured tree, making it easy to read logs from Node.js, Docker, Kubernetes, and other JSON-logging systems.
Is the log analyzer private?
Yes. Your log files are processed entirely in your browser. No data is uploaded to any server, so sensitive application logs, credentials, or personal data never leave your device.