HAR Analyzer - local-first HAR analysis
Analyze HAR files instantly in your browser.
Upload a HAR or JSON capture and inspect request timing, payloads, redirects, server timing, and bottlenecks without sending the file anywhere.
Private by default. No account required. Saved in this browser.
Upload HAR or JSON file
Drop your HAR file here
Uploads are saved locally in this browser.
Upload, drag, or drop a HAR file.
Local analysis, no server required
HAR Analyzer keeps the core workflow on your device. It is built for one-off debugging, sensitive traces, and repeat analysis from the same browser.
Upload, view, understand
Explore the parts of a HAR capture that usually hide the real performance story.
- Slow endpoints and backend bottlenecks
- Large payloads and caching issues
- Blocking JavaScript and waterfall stalls
- Redirects, server timing, and TTFB breakdowns
Generate local test artifacts
Turn request data into k6 scripts, JMeter JMX files, CSV exports, and report snapshots from the local workspace.
Why developers use it
Runs entirely in your browser
HAR files stay on your device
No sign-in flow in the local app
Fast dashboards for request timing and transfer analysis
Exports for performance testing and reporting