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Apache Log Analyzer

Parse Apache Common and Combined Log Format access logs online โ€” free, and nothing is uploaded

Free Online Apache Log Analyzer

Paste an Apache access log and read it as structured entries rather than a wall of text. The analyzer handles both formats Apache ships with: the Common Log Format, which records the client address, identity, user, timestamp, request line, status code, and response size; and the Combined Log Format, which appends the referrer and the user agent. Requests that returned 5xx are classified as errors and 4xx as warnings, so a broken script or a flood of blocked login attempts is visible at a glance. Parsing runs in your browser, so an access log containing visitor IP addresses and authenticated usernames is never transmitted anywhere.

Key Features

  • Parses both the Apache Common Log Format and the Combined Log Format
  • Extracts client address, timestamp, request line, status code, and response size
  • Classifies 5xx responses as errors and 4xx as warnings so failures surface first
  • Filter by severity, then search by keyword across request lines and user agents
  • Export the filtered entries to JSON, CSV, or plain text
  • Fully client-side โ€” no upload, so logs with IPs and usernames stay on your machine
  • Free and open to use with no account and no upload size quota

Common Use Cases

  • Identifying which CGI script or PHP endpoint started returning 500 errors
  • Spotting brute-force login attempts hammering a single URL from one address
  • Auditing 404s after a site migration to build an accurate redirect map
  • Checking whether a rewrite rule is sending traffic where you intended
  • Measuring how much of your traffic is bots by filtering on the user-agent string
  • Reviewing a production log excerpt without handing it to a third-party service

Frequently Asked Questions

How do I analyze an Apache access log online?

Paste the log into the box above and click Parse Logs. Each line is split into its timestamp, request, and status code, and you can then filter by severity or search for a specific path or user agent. The Load sample button fills in an example so you can see the result first.

What is the difference between the Common and Combined Log Format?

The Common Log Format records the client IP, identity, authenticated user, timestamp, request line, status code, and response size. The Combined Log Format is the same plus two extra quoted fields at the end: the referrer and the user agent. This tool reads either one, so you do not need to know which your server is configured for.

Where is the Apache access log located?

On Debian and Ubuntu it is usually /var/log/apache2/access.log. On Red Hat, CentOS, and Fedora it is /var/log/httpd/access_log. The path is set by the CustomLog directive, which can be defined globally or per virtual host, so a site with several vhosts may write to several files.

Is this Apache log analyzer free?

Yes, and there is no sign-up. Because parsing happens in your browser rather than on a server, there is no per-file cost to us and therefore no upload limit or paid tier.

Can I export the parsed Apache log?

Yes. After parsing, export the entries as JSON, CSV, or plain text. Any severity filter or keyword search you have applied is reflected in the export, so you can pull out just the 5xx requests and open them in a spreadsheet.

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100% private. All processing happens in your browser. Your data never leaves your device โ€” no server uploads, no accounts required, no tracking.