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devvkit

devvkit / dev

HAR Analyzer

Upload a .har file and analyze every request: timings, waterfall, payloads.

or

Export a HAR from Chrome DevTools (Network tab → right-click → Save all as HAR with content) or Firefox/Edge, then upload it here. Waterfall, size, and timing analysis run entirely in your browser.

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Upload a HAR file from DevTools and analyze every network request: response sizes, timing breakdowns, status filters, and a color-coded waterfall. Find slow requests without leaving the browser.

>[x]Features
  • -Parse .har files or paste JSON directly
  • -Stats cards: requests, total transfer, largest payload, slowest TTFB
  • -Filter by status code, host, and search query
  • -Waterfall with 6 timing segments per request
  • -Detail panel with headers, timing, and response tabs
  • -Large-payload warnings over 1MB
>>Use Cases
  • >Finding the slowest request on a production page
  • >Auditing third-party scripts and tracking payloads
  • >Debugging TTFB vs. download bottlenecks
  • >Comparing waterfall shapes before/after a fix

Frequently Asked Questions

>Does the HAR file leave my browser??
No. The file is parsed entirely client-side. HAR files can contain sensitive request data, so nothing is uploaded.
>How do I export a HAR file??
In Chrome, open DevTools -> Network tab -> right-click -> Save all as HAR. Firefox and Edge offer the same export. Safari exports via Develop -> Show Web Inspector -> Export.
>Why is the waterfall color-coded??
Each request shows queueing/DNS/connect (including TLS)/send/wait (TTFB)/receive segments so you can spot the slow phase: for example, a slow TTFB points to server-side work.