Log File Analyzer
Stream, search, and filter massive .log files securely in your browser.
Drop your massive .log file here
Processed entirely in your browser memory. No server limits.
What is a Log File Analyzer?
A log file analyzer lets you open, search, filter, and parse large log files (.log, .txt) directly in your browser. Instead of scrolling through thousands of lines in a text editor, you can filter by log level (ERROR, WARN, INFO, DEBUG), search for specific patterns, and quickly locate issues. Our analyzer streams files efficiently so you can handle massive log files without your browser freezing. All processing happens locally — your logs are never uploaded.
How to Analyze Log Files Online
- 1Open your log file
Select a .log or .txt file from your device. The analyzer streams it efficiently.
- 2Filter by log level
Toggle ERROR, WARN, INFO, DEBUG filters to focus on specific log levels.
- 3Search for patterns
Use the search field to find specific text, error codes, or request IDs across the entire log.
- 4Navigate results
Jump between matches and view surrounding context for each result.
Frequently Asked Questions
How large of a log file can I analyze?
Since processing happens in your browser, performance depends on your device. Modern browsers handle log files of 50-100MB comfortably. The analyzer uses streaming to avoid loading the entire file into memory at once.
What log formats are supported?
The analyzer works with any plain text log format. It automatically detects common log levels (ERROR, WARN, INFO, DEBUG) and timestamps in standard formats.
Is my log data private?
Yes. Your log files are processed entirely in your browser using the File API. No data is uploaded, transmitted, or stored on any server.
Why Use DevDeck?
Server logs often contain sensitive data like IP addresses, user IDs, and error details. DevDeck processes everything in your browser — your production logs never leave your device.