Patrick Stox Log File Analyzer is a free web tool for examining server access logs and understanding crawler activity. It automatically detects nginx, Apache, IIS/W3C Extended, and JSON formats, including Cloudflare Logpush. You can upload multiple files without signing up, and large logs are streamed in chunks. Parsing runs in the browser, so pasted or uploaded logs are not sent to the server. Reports show crawl budget by bot and site section, crawler activity by page type, wasted URLs, and daily trends when timestamps are present. Provide a sitemap or expected URL list to compare with crawler requests. The tool also returns ranked recommendations, copy-ready robots.txt lines, and CSV exports for bots and wasted URLs. It compares request IPs with published crawler ranges; those without checkable ranges are marked unverifiable. An optional suspicious-IP check sends one IP to a verifier API for reverse-DNS and ASN lookup. It only analyzes requests present in the logs and does not report indexing outcomes or explain why a crawler chose a URL.
Who it is for
This tool suits people measuring crawler activity, finding crawl-budget waste, comparing AI and search crawlers, or investigating possible bot spoofing. It runs in a browser and requires no signup.
What is good
- Free web tool with no signup
- Automatically detects several log formats
- Parsing runs in the browser
- Exports bot and wasted-URL data as CSV
What to know first
- Analyzes only requests present in the logs
- Does not report indexing outcomes
- Cannot explain why crawlers select URLs
- Range matching may miss impostors using genuine crawler IPs
Verdict
The analyzer turns access logs into crawler-focused reports, recommendations, and exports without sending uploaded logs to the server. Its findings are limited to logged requests and cannot establish indexing outcomes or explain URL selection.
Get started with Patrick Stox Log File Analyzer
- Open the Log File Analyzer website.
- Upload one or more server log files.
- Optionally provide a sitemap or expected URL list for comparison.
- Review crawler, crawl-waste, and trend reports.
- Export bot or wasted-URL data as CSV, or use the ranked recommendations.
What the free plan stops at
The analyzer can only report requests present in the logs and does not provide indexing outcomes or reasons for URL selection. Range matching may miss impostors using genuine crawler IPs, and crawlers without published ranges cannot be distinguished by range matching alone.
Questions about Patrick Stox Log File Analyzer
How much does the analyzer cost?
The Free plan costs 0.00 USD per free.
Do I need to sign up?
No signup is required. Multiple files can be uploaded, and large logs are streamed in chunks.
Which log formats does it support?
It detects nginx, Apache, IIS/W3C Extended, and JSON logs, including Cloudflare Logpush.
Are uploaded logs sent to a server?
Log parsing runs in the browser, and pasted or uploaded logs are not sent to the server. An optional suspicious-IP check sends a single IP to a verifier API for reverse-DNS and ASN lookup.
What does it include in its reports?
Reports include crawl budget by bot and section, crawler activity by page type, wasted URLs, and daily trends when timestamps are present. It also provides ranked recommendations and CSV exports.
How does crawler verification work?
It compares request IPs with crawler operators’ published ranges. Crawlers without checkable ranges are marked unverifiable, and range matching may miss an impostor using a genuine crawler IP.
Patrick Stox Log File Analyzer plans and pricing
All plansCompared on SEO log file analysis tools
- Free plan
- Yes
- Log input methods
- upload
- Crawler segmentation
- Yes
- Crawl waste reports
- Yes
