HAR Viewer – Inspect HAR files fast, offline, private, no uploads needed

Summary: HAR Viewer is a free, open-source browser tool for viewing HAR files offline with instant search, filtering, timing waterfalls, performance insights, and export options. It processes large files locally without uploading data.

What it does

It loads HAR files directly in the browser, enabling detailed analysis through search, filtering, and performance visualization without server involvement.

Who it's for

Developers and analysts needing to inspect large HAR files securely and privately on their local machine.

Why it matters

It eliminates the need to upload sensitive data by processing HAR files entirely offline while handling thousands of requests efficiently.