Drop your log file here
or click to browse files
Supports .log, .txt, .out, .err and other text formats up to 50MB
View, filter and search log files directly in your browser with automatic level detection and colour highlighting. Need a different format? Try the TXT Viewer, JSON Viewer or CSV Viewer. Your files stay private - everything runs locally.
or click to browse files
Supports .log, .txt, .out, .err and other text formats up to 50MBAutomatic colour coding for ERROR, WARN, INFO, DEBUG and TRACE, plus timestamp detection for fast scanning.
Filter by severity from the dropdown or click a stat chip to isolate just errors or warnings instantly.
Instant search with match highlighting and prev/next navigation across all visible entries.
Your log files are processed entirely in your browser. Nothing is uploaded to any server.
Access logs, error logs and combined web-server formats.
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 with recognisable timestamp and level patterns.
This viewer supports any text-based log file. It auto-detects Apache/Nginx logs, syslog and application logs from Java, Python and Node.js. Levels like ERROR, WARN, INFO, DEBUG and TRACE are highlighted regardless of the exact format. For structured data instead, use the JSON Viewer or CSV Viewer.
No. Log files are processed entirely in your browser with JavaScript. The content never leaves your computer, making this safe for sensitive production logs, stack traces and debug output.
Up to 50MB. For extremely large logs, filter to a single level and use Export Filtered to work with a smaller subset, or split the file before viewing.
Search is case-insensitive text matching with highlighting and match navigation. For complex pattern work, export the filtered log and use grep or a desktop tool.
Each line is scanned for level keywords: ERROR/FATAL/CRITICAL (red), WARN/WARNING (amber), INFO/NOTICE (blue), DEBUG (grey) and TRACE/VERBOSE (light grey). Both uppercase and common framework variants are recognised.
Yes. Filter to the levels you want, then click Export Filtered for a plain .log file, or Download ZIP to get the filtered log plus the full log and a README in a single archive - ideal for sharing just the errors with your team.