HAR File Analyzer & Sanitizer
Free online HAR file inspector and security sanitizer. Analyze browser network logs, identify slow API endpoints, filter HTTP status codes, and scrub sensitive authorization headers before sharing logs with third-party vendors or support teams.
Upload or Drag & Drop your .HAR file here
Exported from Chrome, Firefox, Safari, or Edge DevTools Network tab
Step-by-Step Instructions
Upload HAR File
Drag and drop a `.har` (HTTP Archive) file exported from Chrome, Edge, Firefox, or Safari DevTools.
Examine Waterfall & Timing Breakdown
Inspect the interactive network request waterfall chart showing DNS Lookup, TCP Handshake, SSL/TLS, TTFB, and Content Download times.
Filter Requests by Type & Status
Filter by HTTP status codes (2xx, 3xx, 4xx, 5xx), MIME types (XHR/Fetch, JS, CSS, Images, Fonts), and domain.
Inspect Request Headers & Payloads
Click any request to view complete request/response headers, cookies, query parameters, and response bodies.
Key Features & Capabilities
- Interactive Network Waterfall chart detailing DNS, Connect, SSL, Wait (TTFB), and Receive timings
- Page load performance summary: Total Page Load Time, Requests Count, Total Transfer Size, and Uncompressed Size
- MIME type distribution breakdown (JavaScript, CSS, Images, Media, Documents, Fonts)
- 100% private client-side HAR analysis ensuring confidential session tokens and cookies in the HAR are never uploaded
Frequently Asked Questions
What is a HAR (HTTP Archive) file and how do you export it?
A HAR (HTTP Archive) file is a JSON-formatted archive recording all network interactions between a web browser and server. To export in Chrome: Open DevTools (`F12`) > **Network** tab > click the **Export HAR (down arrow icon)** to save all recorded network requests.
What does Time to First Byte (TTFB) represent in a HAR waterfall?
**TTFB (Waiting / Server Response Time)** is the duration between the browser sending the HTTP request and receiving the first byte of response data from the server. A high TTFB (>600ms) indicates slow backend database queries, unoptimized server-side rendering, or server CPU bottlenecks.
Can sensitive authentication cookies or passwords be leaked in a HAR file?
Yes. HAR files record raw HTTP headers, meaning session cookies (`Cookie: session=...`), Bearer authorization tokens, and form passwords submitted during recording are stored in plaintext inside the HAR file. Because our analyzer runs 100% client-side, your HAR file is never uploaded to any external server.
How does HAR analysis identify slow web assets?
The analyzer highlights slow network requests: large uncompressed images, render-blocking JavaScript bundles, slow third-party analytics scripts, and 404/500 HTTP errors that degrade page performance.
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