Are my HAR files uploaded to any external server?

No. All parsing and waterfall rendering take place 100% locally in your web browser. Confidential session cookies and authorization tokens never leave your machine.

How do I export a HAR file from Google Chrome or Microsoft Edge?

Open DevTools (F12) -> go to the Network tab -> reproduce your network issue -> click the "Export HAR" button (downward arrow icon) in the toolbar.

Why should I mask sensitive headers before sharing a HAR trace?

HAR files contain full Authorization tokens and session cookies. Sharing unredacted HAR files allows recipients to impersonate your user session. Privacy masking protects your credentials.

HAR File Viewer & Network Waterfall Analyzer

100% private in-browser HAR network waterfall inspector with sensitive token auto-masking.

Security Guarantee: 100% Client-Side In-Browser Execution. Computations run locally within browser RAM. Zero remote telemetry.

Technical Overview & Architecture

100% private in-browser HAR file viewer. Inspect HTTP archives, analyze network waterfall timelines, DNS and TTFB latency, and headers with zero server uploads.

The tool reads the HAR (HTTP Archive) JSON specification via the client-side File API and computes microsecond phase offsets across each entry to render an interactive waterfall timeline.

Key Capabilities & Features

Zero-Upload Privacy Sandbox: Large .har files containing session tokens, cookies, and authorization headers are parsed strictly inside browser RAM.
Network Waterfall Timeline: Visual timing phases breakdown (DNS resolution, SSL handshake, TTFB wait, and content transfer).
Sensitive Header Auto-Masking: Automatically redacts Authorization bearer tokens and Set-Cookie directives to safely share traces.
Status & MIME Filters: Instantly isolate 4xx/5xx failures, REST JSON payloads, stylesheets, or static image bundles.

Step-by-Step Usage Guide

Open or Drop a .HAR File: Export a HAR trace from Chrome/Firefox DevTools or click "Load Sample" to inspect a live trace.
Analyze Network Waterfall: Filter by HTTP status (2xx, 4xx, 5xx) or search by URL endpoint to find slow resources.
Inspect Headers & Payloads: Click any request to view full request/response headers, timing phases, and returned payloads.

Frequently Asked Questions (FAQ)

Are my HAR files uploaded to any external server?: No. All parsing and waterfall rendering take place 100% locally in your web browser. Confidential session cookies and authorization tokens never leave your machine.
How do I export a HAR file from Google Chrome or Microsoft Edge?: Open DevTools (F12) -> go to the Network tab -> reproduce your network issue -> click the "Export HAR" button (downward arrow icon) in the toolbar.
Why should I mask sensitive headers before sharing a HAR trace?: HAR files contain full Authorization tokens and session cookies. Sharing unredacted HAR files allows recipients to impersonate your user session. Privacy masking protects your credentials.