Log File Viewer Online — Free Log Analyzer & Filter | Online Gallery
Filter & search server logs with error/warn highlighting. Analyze system logs, server debug outputs, and crash reports with real-time severity highlighting.
What is Log Viewer and what does it do?
Analyze server logs, debug outputs, and crash reports (.log, .out, .err) with real-time severity filtering.
- Filter logs by Errors, Warnings, and Info severity levels.
- Search for specific exception keywords and stack traces.
- Line numbers and high-contrast terminal styling.
How does Log Viewer work?
Splits log streams in memory and filters lines using reactive RegExp matching.
100% private: all processing happens locally in your browser using client-side WebAssembly, WebCrypto, WebAudio, and HTML5 Canvas. Your files are never uploaded to any server.
Who needs Log Viewer?
DevOps & Sysadmins
Inspect server dumps and error logs without transferring proprietary code logs.
Supported file formats
Log File & Console Viewer (.log) opens and processes the following file extensions directly in your browser:
.log.out.errHow to use Log Viewer — step by step
- 1
Open Log
Drop your server .log or .err output file.
- 2
Filter Severity
Select Errors, Warnings, or search specific keywords.
Frequently asked questions
Can it handle large log files?
Yes, runs locally in browser virtual memory without upload lag.
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