HAR File Analyzer

Visualize browser network waterfalls from .har files. See request timings, status codes, slowest calls, largest responses. Runs entirely in your browser — nothing uploaded.

1.0.0
Version
Auth
Batch
Zero uploads. HAR files are parsed entirely in your browser — nothing is sent to a server.

Upload a .har file

Exported from Chrome/Firefox DevTools Network tab

HAR File Analyzer Tutorial

What is a HAR file?

HAR (HTTP Archive) is the JSON format browsers use to export a page's complete network activity. It captures every request the page made: timing breakdown (DNS, connect, wait, download), status codes, payload sizes, headers. DevTools gives you one-click export.

How to Export a HAR File

  • Chrome/Edge: Open DevTools → Network tab → reload the page → right-click any request → "Save all as HAR with content"
  • Firefox: Dev Tools → Network → gear icon → "Save All As HAR"
  • Safari: Develop menu → Web Inspector → Network → Export

What You'll See

  • Stats cards — totals, status code distribution, total transfer size
  • Waterfall timeline — every request plotted against page time, with color-coded phases (DNS, connect, wait, receive)
  • Slowest requests — top 10 by time
  • Largest responses — top 10 by bytes
  • Resource type breakdown — scripts vs images vs XHR
  • Domain breakdown — how many requests went to each host
  • Filterable request table — search by URL or status

Why In-Browser?

HAR files often contain auth tokens, cookies, and API payloads — in short, secrets. Uploading one to a random server is dangerous. This tool runs entirely as JavaScript in your browser; your HAR never leaves the page.