Is HAR File Viewer free to use?

Yes, HAR File Viewer on DevHexLab is completely free. No login, no account, and no payment required.

Does HAR File Viewer upload my data to a server?

No. HAR File Viewer runs entirely in your browser using client-side JavaScript. Your data never leaves your device and is never sent to any server.

Can I use HAR File Viewer offline?

Yes. Once the page is loaded, HAR File Viewer works without an internet connection because all processing happens locally in your browser.

What category does HAR File Viewer belong to?

HAR File Viewer belongs to the "Network & API" category on DevHexLab. Test HTTP endpoints, inspect request and response headers, perform DNS lookups, check IP geolocation, and encode URLs for safe transmission. These tools speed up API debugging and infrastructure troubleshooting without requiring any local installation.

HAR File Viewer

Inspect HAR exports, summarize requests, status codes, errors, URLs, and recorded timings.

harnetworkbrowserperformancedebug

HAR File Viewer

Input

Unexpected end of JSON input

HAR File Viewer is coming soon

This tool is actively being built and will be available shortly. All other tools on DevHexLab are free and ready to use now.

Check back soon

Learn more

Step-by-step guide

How to Analyze a HAR File to Debug Network Issues

Export a HAR file from browser DevTools and use the HAR Viewer to find slow requests, failed API calls, and network bottlenecks.

In-depth article

How to Analyze HAR Files to Debug Network Issues

Learn how to read HTTP Archive (HAR) files exported from browser DevTools to diagnose slow pages, failed requests, and API errors.

Related Tools

HTTP Request Builder

Build HTTP requests with method, URL, headers, and body, then copy a ready-to-run cURL command.

CORS Header Tester

Check what CORS headers a URL returns and debug cross-origin issues

HTTP Header Viewer

Inspect and decode HTTP request and response headers