HAR Viewer Online — Free HTTP Archive Network Waterfall Explorer | Online Gallery
Inspect DevTools network requests, latency waterfalls, and headers offline. Analyze HTTP Archive (.har) web network traces with interactive waterfall timeline, response codes, headers, and payload previews.
What is HAR Waterfall Viewer and what does it do?
The HAR Network Capture & Waterfall Viewer displays HTTP Archive network requests with interactive timing waterfalls.
- Display visual waterfall timeline of all HTTP requests.
- Filter by status code and resource type (XHR, JS, CSS, Images).
- Inspect request and response headers and payloads.
How does HAR Waterfall Viewer work?
Parses browser DevTools HAR JSON exports, calculating latency durations and displaying detailed request trees.
100% private: all processing happens locally in your browser using client-side WebAssembly, WebCrypto, WebAudio, and HTML5 Canvas. Your files are never uploaded to any server.
Who needs HAR Waterfall Viewer?
Web Performance & QA Engineers
Debug web performance bottlenecks and API latency issues safely offline.
Supported file formats
HAR Network Capture & Waterfall Viewer (.har) opens and processes the following file extensions directly in your browser:
.harHow to use HAR Waterfall Viewer — step by step
- 1
Open HAR File
Select your browser network export (.har).
- 2
Explore Waterfall
Identify slow API requests and assets on the visual waterfall chart.
- 3
Inspect Headers & Body
Click any request to view HTTP response headers and JSON body.
Frequently asked questions
Are network cookies or tokens uploaded?
Never. The HAR file is parsed strictly inside your browser sandbox.
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