Patrick Stox Log File Analyzer
Patrick Stox Log File Analyzer is a free web tool for analyzing server access logs and reviewing crawler activity.
What Patrick Stox Log File Analyzer is
Patrick Stox Log File Analyzer is a free web tool for analyzing server access logs and reviewing crawler activity. It can highlight crawl-budget use and waste, AI crawler traffic, and possible crawler impersonators. The tool recognizes nginx, Apache, IIS/W3C Extended, and JSON logs, including Cloudflare Logpush. Parsing runs in the browser, and pasted or uploaded logs are not sent to the server. Reports include crawl budget by bot and section, crawler activity by page type, wasted URLs, and daily trends when timestamps are present. Users can supply a sitemap or expected URL list to compare with crawler requests. The tool also offers ranked recommendations, copy-ready robots.txt lines, and CSV exports for bots and wasted URLs. Crawler verification compares request IPs with operators' published ranges; those without checkable ranges are marked unverifiable. An optional suspicious-IP check sends a single IP to a verifier API for reverse-DNS and ASN lookup. The tool only analyzes requests present in the logs; it does not show indexing outcomes or explain why a crawler selected a URL. It is available without signup and supports multiple files.
Good
- Free and requires no signup.
- Parses logs in the browser.
- Recognizes nginx, Apache, IIS, and JSON logs.
- Provides crawler and wasted-URL reports.
- Exports bot and wasted-URL data as CSV.
Watch out
- Only analyzes requests present in the logs.
- Does not report indexing outcomes.
- Range matching may miss impostors using genuine crawler IPs.
- Unpublished crawler ranges cannot be distinguished by range matching alone.
Who it suits
This tool may suit site operators investigating crawler activity, crawl-budget waste, AI and search crawler traffic, or possible bot spoofing. It is useful for people who can provide access logs and, optionally, a sitemap or expected URL list.
Verdict
The analyzer turns access logs into crawler breakdowns, waste reports, and recommendations while keeping log parsing in the browser. Its findings are limited to logged requests, and IP-range verification cannot identify every possible impostor.
Plans and prices
From Patrick Stox Log File Analyzer's own pricing page, checked 4 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Free | Free | No signup · multiple files · large logs stream in chunks |
The facts
Each one read from Patrick Stox Log File Analyzer's own pages, with the date it was checked.
What it does
- Audience and use cases
- The maker describes use cases including measuring crawler activity, finding crawl-budget waste, comparing AI and search crawlers, and investigating possible bot spoofing.checked 4 Oct 2026
- Crawler verification
- It compares request IPs with crawler operators’ published ranges and marks crawlers without checkable ranges as unverifiable.checked 4 Oct 2026
- Expected URL comparison
- Users can supply a sitemap or expected URL list to compare against crawler requests.checked 4 Oct 2026
- Limits
- It can only analyze requests present in the log and does not report indexing outcomes or explain why a crawler selected a URL.checked 4 Oct 2026
- Local processing
- Log parsing runs in the browser, and pasted or uploaded logs are not sent to the server.checked 4 Oct 2026
- Log formats
- It auto-detects nginx, Apache, IIS/W3C Extended, and JSON logs including Cloudflare Logpush.checked 4 Oct 2026
- Optional network check
- The optional suspicious-IP spot-check sends a single IP to the verifier API for reverse-DNS and ASN lookup.checked 4 Oct 2026
- Privacy detail
- Anonymous run-level outcome counters may be used for aggregate research, with no URLs, domains, IPs, or identifiers included and no statistic released below 100 runs.checked 4 Oct 2026
- Purpose
- Analyzes server access logs to show crawler activity, crawl-budget waste, AI crawler traffic, and likely crawler impersonators.checked 4 Oct 2026
- Recommendations and export
- It provides ranked recommendations with copy-paste robots.txt lines and CSV exports for bots and wasted URLs.checked 4 Oct 2026
- Reports
- Reports include crawl budget by bot and section, crawler-by-page-type matrix, wasted URLs, and daily trends when logs contain timestamps.checked 4 Oct 2026
- Support
- The page offers bug reports through a private triage queue and feature requests that are reviewed before appearing publicly.checked 4 Oct 2026
- Verification limit
- IP-range matching may miss an impostor using a genuine crawler IP, and crawlers without published ranges cannot be distinguished by range matching alone.checked 4 Oct 2026
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