Why this tool is useful
Turn a browser network capture into a compact performance triage report while avoiding the credential exposure risk of sending raw HAR content to a remote viewer.
Local File Tools · runs locally
Private HAR Performance Analyzer
Inspect a bounded HTTP Archive for slow requests, large transfers, failures, status groups, host totals and recorded waterfall span without replaying any URL.
Ready. Your working data stays in this browser.
Files and capture streams stay on this device. Processing uses browser APIs only; nothing is uploaded to YTSave, the media API or a proxy. No server copy is created, stored or left to delete. The file picker is cleared when processing starts, and disposable worker memory is destroyed after completion or cancellation. Preview and generated-output memory is released when you clear the tool or leave the page.
How it works
A strict local JSON parser caps entry count and output size, normalizes recorded timings and byte fields, groups statuses and hosts, and masks query values and token-like path segments.
Practical example
Export a checkout trace from browser DevTools, choose ten ranking rows, then compare the slowest requests, largest responses and busiest hosts without contacting the captured site.
Validation
The calculation is deterministic and explains validation errors instead of silently changing invalid input.
Privacy boundary
Input and output remain in this tab. Copy and download happen through browser APIs without a server upload.
Result passport
Every run reports its tool mode, timestamp and input/output size so transformed data can be audited.