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Features
EasyGC is a free, browser-local GC log analyzer: no accounts, no quotas, and your logs never leave your machine. Everything it offers, in one list.
No quotas
Unlimited analyses per month — nothing to sign up for, nothing to count.
Data never leaves the browser
Logs are parsed in local memory only — never uploaded, never stored, works offline.
Self-hostable
The whole site is a static build — deploy it on an intranet host and it runs on premise.
| Core analysis | |
| GC log analysis | Serial / Parallel / ParNew+CMS / G1 / ZGC / Shenandoah, Java 1.2–25, both unified logging (-Xlog:gc*) and classic PrintGCDetails formats |
| Problem detection | Automatic signals for memory leaks (regression fit), consecutive Full GCs, low throughput, long pauses, metaspace pressure and humongous allocations |
| Tuning recommendations | 15-rule deterministic engine — every piece of advice is tied to real data in your log, with four severity levels |
| Visual report | KPI cards + 5 charts: heap sawtooth, pause times, GC causes, reclaimed bytes per GC, allocation & promotion |
| Metrics | |
| Pause metrics | Average / P99 / max / standard deviation / total pause time |
| Pause distribution | Histogram buckets from 0–10 ms up to ≥ 1 s with counts and share |
| Object statistics | Total allocated & creation rate, total promoted & promotion rate |
| CPU time | Aggregated user / sys / real wall time |
| Reclaimed bytes | Per-collection and total reclaimed heap |
| GC causes | Count, share, total time and average time per cause |
| Event table & filter | Full event list with live filtering by type / cause / collector |
| Privacy & limits | |
| Unlimited analyses | No account, no quota, no counter |
| Local-only data | Parsed in browser memory — nothing is transmitted or stored |
| 20 MB / file | Browser-side parsing limit; drag & drop or paste |
| Free forever | Every feature open to everyone, no login |
| Self-hostable | Pure static site — run it inside your intranet |
| Export & experience | |
| PDF export | A4 paginated snapshot with export timestamp |
| Word export | .doc with embedded charts, editable in Word / WPS |
| JSON export | Full structured data for automation pipelines |
| English & 简体中文 | Entire site and reports, switchable anytime |
| Dark & light themes | Charts adapt to the theme automatically |
| Search & offline | Site-wide doc search; works offline after the page loads |
TIP
No log at hand? Open the analyzer and click any sample (G1 / Parallel / CMS / memory leak) to see a full report instantly.