Apache Access Log Parser

Apache’s access log is the first stop for anyone diagnosing web traffic — but access.log lines are compact and easy to misread by eye. Apache Access Log Parser converts them into a readable table in seconds: paste the file, and every line becomes a row with client IP, remote logname, authenticated user, timestamp, request method, path, HTTP status and payload size separated into columns.

The tool understands both the Common Log Format (%h %l %u %t \"%r\" %>s %b) and the Combined Log Format, which adds a quoted referer and user-agent after the byte count. It tries Combined first on every line and falls back to CLF automatically, so a real-world file where some requests have a referer and some don’t — or where two vhosts log in different formats — still parses correctly line by line, with no format picker required unless you want to force one. Timestamps in Apache’s bracketed [10/Oct/2000:13:55:36 -0700] form are translated to ISO 8601, offset included, so the column sorts correctly and drops straight into any tool that expects standard dates.

Below the table, summary cards answer the questions people actually ask when triaging traffic: how many 4xx and 5xx responses are in this window, which HTTP methods dominate, and how many distinct client IPs hit the server. A status-code breakdown shows both the class totals (2xx/3xx/4xx/5xx) and, in the exact-code counts, whether a 5xx spike is really one flavor of error (say, 502 from an upstream) or several different failures mixed together. Lines that don’t match either format — truncated entries, log rotation artifacts, or rows from an unrelated file pasted in by mistake — are counted as failures and listed with their original line numbers instead of being silently dropped, so you can decide whether to fix, ignore or investigate them.

Once you’ve reviewed the table, Copy as CSV and Download CSV give you a spreadsheet-ready export, Download JSON gives scripts and dashboards an array of typed records, and Print produces a quick audit trail. All of this — parsing, timestamp conversion, aggregation and export — happens entirely in your browser; the log text you paste is never sent anywhere.

• Automatic format detection between CLF and Combined Log Format, tried per line so mixed files just work.
• Table with all access-log fields — IP, user, timestamp, method, path, status, bytes, referer and user-agent — as separate columns.
• Apache timestamps converted to ISO 8601 with the original UTC offset preserved.
• Status breakdown by class (2xx/3xx/4xx/5xx) and by exact code, shown as color-coded badges.
• Method totals — GET, POST, PUT, DELETE and friends, tallied and sorted alphabetically.
• Unique client IP count per file, alongside total, parsed and failed line counts.
• Failed lines listed with their original line numbers so you can fix or ignore them without hunting.
• Toggle to show/hide the failed-lines list without re-parsing.
• Copy CSV / Download CSV / Download JSON / Print export options.
• 100% local — nothing leaves the browser, no upload, no server round trip.

1. Paste your access log. Drop the contents of access.log, ssl-access.log, or any excerpt of either into the box, or click Load sample to see a mix of CLF and Combined lines including one intentionally malformed line.
2. Pick a format if needed. Leave Auto selected for mixed files, or pin Combined/CLF if you know every line uses the same format and want stricter matching.
3. Parse. Click Parse (or just keep typing — the table updates as you edit). The tool detects CLF or Combined per line and builds the table instantly.
4. Review the summary. Status classes, exact status-code badges, method totals and unique IP counts appear above the table the moment parsing finishes.
5. Inspect failures. Lines that did not parse are listed separately with line numbers, so you can spot truncated entries, unusual quoting, or rows from a different log mixed in.
6. Explore. Scroll the table, sort by eye for heavy paths and 5xx clusters, and cross-reference the badges above.
7. Export. Copy as CSV, download a CSV or JSON file, or print the table for an audit trail or incident report.

Example 1 — CLF line. 127.0.0.1 - frank [10/Oct/2000:13:55:36 -0700] "GET /apache_pb.gif HTTP/1.0" 200 2326 parses to IP 127.0.0.1, user frank, method GET, path /apache_pb.gif, status 200, 2326 bytes, timestamp 2000-10-10T13:55:36-07:00.

Example 2 — Combined line. Adding "http://www.example.com/start.html" and a user-agent string after the byte count populates the referer and user-agent columns as well, without changing anything else about how the line is read.

Example 3 — Error flood. Paste a day of logs and scan the 5xx badge for the overall count; then check the exact-code breakdown to tell 502 (bad gateway, usually upstream) apart from 503 (service unavailable, usually overload) without grepping the raw file.

Example 4 — VHost mix. Two sites share one combined log file, one logging Combined and the other plain CLF; auto-detection handles each line individually instead of forcing one pattern on the whole paste, and both show up correctly in the same table.

Example 5 — Bot and scanner triage. A run of 404s and 405s from the same handful of IPs with automation-style user-agents (python-requests, curl) stands out immediately in the table and the unique-IP count, without writing a single regex.

• No regex required — paste and read, with auto-detection doing the format guessing for you.
• Status and method analytics built in, so you don’t need a separate script for a quick traffic summary.
• Clean ISO timestamps with offsets preserved, ready for sorting, filtering or feeding into other tools.
• Nothing silently dropped — malformed lines are counted and listed, not hidden.
• Spreadsheet and JSON export in one click, for reports, dashboards or further scripting.
• Private: parsing runs entirely client-side; logs are never uploaded or transmitted.