View a Log File Online
Search and Filter Log Files by Level, Free
Need to use View a Log File Online right now?
Filter down to ERROR or WARN lines instantly instead of scrolling a wall of uniform text.
Features
- Runs entirely in your browser
- Privacy-first — your data is never uploaded
- Real-time, instant results
- 100% free, no sign-up required
- Works on desktop, tablet, and mobile
- No installation needed
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About View a Log File Online
Raw log files are dense, uniform walls of text — finding the actual error buried among hundreds of routine INFO lines usually means scrolling and squinting, or writing a quick grep command just to filter down to what matters.
This tool color-codes every log line by its detected level (ERROR and FATAL in red, WARN in amber, INFO in blue, DEBUG muted), shows a count badge for each level found, and lets you click a badge to filter down to just that level, combined with a free-text search box for filtering by keyword.
Level detection works by matching common log level keywords directly in each line's text — it doesn't require a specific log format, so it works reasonably well across server logs, application logs, and most conventional logging output, though logs using non-standard level naming won't be color-coded.
How it works
- Paste or upload a log file. Paste log text directly, or upload a .log or .txt file.
- Filter by level. Click a level badge (ERROR, WARN, INFO, DEBUG) to filter to just that level.
- Search by keyword. Type in the search box to filter lines containing specific text.
Examples
Filtering to errors only
Input
A log with mixed INFO and ERROR lines, click the ERROR badge
Output
Only lines containing "ERROR" are shown, highlighted in red.