Drop your log file here
or click to browse files
Supports .log, .txt, .out, .err and other text formats up to 50MB
View, search, and analyze log files directly in your browser. Features syntax highlighting, log level filtering, and powerful search. Your files stay private - everything runs locally.
or click to browse files
Supports .log, .txt, .out, .err and other text formats up to 50MBAutomatic color coding for log levels (ERROR, WARN, INFO, DEBUG) and timestamps for easy scanning.
Filter logs by severity level. Quickly isolate errors, warnings, or debug messages.
Find specific entries with instant search, match highlighting, and navigation between results.
Your log files are processed entirely in your browser. Nothing is uploaded to any server.
Access logs, error logs, and combined log formats from web servers.
Standard Unix/Linux system logs with facility and severity levels.
Java, Python, Node.js, and other application logs with standard levels.
Any text-based log file with recognizable timestamp and level patterns.
This viewer supports any text-based log file. It automatically detects common patterns including Apache/Nginx logs, syslog, application logs (Java, Python, Node.js), and most custom formats. Log levels like ERROR, WARN, INFO, DEBUG, and TRACE are highlighted regardless of the specific format.
No. Your log files are processed entirely in your web browser using JavaScript. The file content never leaves your computer, making this tool safe for viewing sensitive server logs, error reports, or debug output.
The viewer supports files up to 50MB. For very large files, the viewer uses virtualization to display only visible lines, keeping performance smooth. If you have extremely large log files, consider splitting them before viewing.
Currently the search supports simple text matching (case-insensitive). It highlights all matches and lets you navigate between them. For complex pattern matching, we recommend exporting the filtered log and using specialized tools like grep.
The viewer scans each line for common log level keywords: ERROR/FATAL/CRITICAL (red), WARN/WARNING (orange), INFO/NOTICE (blue), DEBUG (gray), and TRACE/VERBOSE (light gray). It recognizes both uppercase and common variations used by different logging frameworks.
Yes! First use the filter dropdown to show only the log levels you want. Then click "Export Filtered" to download a new file containing only the visible log entries. This is great for extracting just errors or warnings to share with your team.