Log File Analyzer - Parse & Analyze Logs
Upload or paste a server access log to extract real statistics: top IPs, status-code distribution, error counts, traffic timeline, browser/bot breakdown, and security events. Supports Apache (Common/Combined), Nginx, and IIS W3C formats.
Understanding This Tool
What It Does
Parse and analyze log files to extract patterns, errors, and statistics. This tool helps make sense of large log files by summarizing key information.
Understanding the Results
- Requests parsed: Total access-log lines read, plus any skipped as unparseable
- Status codes: A breakdown of HTTP status codes, with 4xx (client) and 5xx (server) errors highlighted
- Top IPs: The busiest client IP addresses and each one's share of traffic
- Top pages: The most-requested URLs
- Traffic over time: Requests per hour and the peak period
- Bots & clients: Browser breakdown and identified crawlers/bots
Common Use Cases
- Traffic analysis: See your busiest pages, peak hours, and visitor IPs
- Error triage: Spot spikes in 404s (broken links or scanners) and 5xx (a failing backend)
- Security monitoring: Detect suspicious request patterns and abusive IPs in your access logs
- Bot detection: See how much of your traffic is automated crawlers
- Capacity planning: Understand request volume and usage patterns over time
Pro Tips & Best Practices
- Supported formats: Apache (Common/Combined), Nginx, and IIS W3C access logs - the format is auto-detected
- Access logs, not app logs: This reads HTTP access logs (requests + status codes), not application/severity logs (DEBUG/INFO/WARN/ERROR)
- Large files: Paste log text or upload a plain-text file (up to 5 MB)
Last reviewed:
How this tool works: This tool runs in your browser and on our server in real time. Depending on the tool, results are computed directly from the input you provide or retrieved from live, authoritative data sources at the moment you run a lookup. We do not sell your data, and your lookups are kept private — any history shown here is stored only on your device.