Analyze log files — error grouping, level counts, time clustering. Find the 3am spike cause in minutes — local parsing, free, no signup.
Content reviewed October 2026 · About Toolzum
Analyze HAR network captures — waterfall timing, payload sizes, failed requests. Find the 3-second render blocker in minutes — local parsing, free, no signup.
Profile JSON payload weight — byte size, key counts, nesting depth, and heavy branches. Find the 2 MB field bloating responses — local analysis, free, no signup.
Parse cron expressions into human-readable descriptions. Includes common presets for quick reference. Presets plus plain-English schedules prevent 3am surprises — local parsing, free, no signup.
Analyze CSV structure — column types, counts, unique values, and empty cells. Spot malformed rows and mixed types before import.
Add hours and minutes to any time — shift schedules, compute end times, total durations. Add 8h30m to 9:00 for shift end — free, local, no signup.
Group by message signature: 10,000 lines collapse to 20 unique errors ranked by count. Fix the top one — cascades often share a root cause.
Errors bucketed per minute reveal onsets (deploy at 3:04 → errors at 3:05). Correlate spikes with deploys and cron schedules.
Hundreds of thousands of lines parse locally; gigabyte archives need sampling or CLI tools. Filter by level first to shrink noise.
No — parsing runs locally in your browser. Logs never leave your device — still sanitize secrets before sharing exports.
HAR File Analyzer
Analyze HAR network captures — waterfall timing, payload sizes, failed requests. Find the 3-second render blocker in minutes — local parsing, free, no signup.
Data Anonymizer
Mask PII in datasets — names, emails, phones, IDs — with consistent fake replacements. Share analytics safely under privacy rules — local processing, free, no signup.