🌐 HAR Analyzer — Free & Local-first. Cloud when you need it.
Analyze HAR files instantly in your browser with no upload required.
The core experience is free, private, and stored only on your device. And when you’re ready to take performance to the next level, HAR Analyzer Cloud adds history, comparisons, sharing, and load test exports — without changing the way you work.
Start simple. Stay private. Upgrade only if you outgrow local.
Upload HAR or JSON file
Drop your HAR file here
Uploads while signed out are saved only on this device.
Upload, drag, or drop a HAR, no login or upload required.
🔥 Local Mode (free forever): Perfect for one-off debugging, sensitive data, or private traces. Runs entirely in your browser, HAR files never leave your device, and there’s no account, paywall, or limits on analysis. Just drag, drop, and debug. You can use HAR Analyzer forever without paying a cent.
☁ Cloud Mode (optional upgrade): For teams, long-term tracking, and performance engineering at scale. Adds persistent history, comparisons across releases, sync across devices, sharing links, and one-click export from HAR → k6 or JMeter without changing your existing workflow.
🔥 Local Mode (free forever)
Perfect for one-off debugging, sensitive data, or private traces.
- ✔ Runs entirely in your browser
- ✔ HAR files never leave your device
- ✔ No account required
- ✔ No paywall, no limitations on analysis
- ✔ Just drag, drop, and debug
You can use HAR Analyzer forever without paying a cent.
☁ Cloud Mode (optional upgrade)
For teams, long-term tracking, and performance engineering at scale.
Cloud gives you:
- 🔹 Persistent history of HAR runs
- 🔹 Compare results across releases
- 🔹 Sync across devices
- 🔹 Share links with teammates
- 🔹 Export HAR → k6 or JMeter in one click
Think of it as Local Mode + memory + collaboration + automation.
Upload, View, Understand - Free & Private
Upload a HAR or JSON capture and immediately explore:
- slow endpoints & backend bottlenecks
- large payloads & caching issues
- blocking JavaScript and waterfall stalls
- redirects, server timing, TTFB breakdown
You get the insight locally, no server required.
HAR → k6 / JMeter (Cloud Feature)
Have traffic → generate load test.
Housing your HAR in the cloud unlocks:
- 🚀 One-click k6 or JMeter export
- 📈 Load thresholds and VUs preconfigured
- 🔍 Replay real traffic patterns in CI
- 🏎 Faster iteration = faster fixes
Why developers choose HAR Analyzer
Designed so you can start instantly for free, and upgrade only if you need more.