Processed locally in your browser — your file is never uploaded.
Legend DNS Lookup Initial Connection SSL/TLS Waiting (TTFB) Content Download
About this tool
A HAR file is a JSON record of every network request a browser made — the standard way to capture and share a network session for debugging.
Drop in a .har export and browse requests like a Network tab: filter by status, sort by duration, and open full headers and bodies.
HAR files can contain cookies and tokens. This viewer parses everything locally — nothing is uploaded.
Frequently asked questions
How do I create a HAR file?
In Chrome DevTools’ Network tab, record the traffic, then right-click → "Save all as HAR with content". Firefox and Edge work the same way.
Are HAR files sensitive?
Often, yes — they capture cookies, auth headers and request bodies. Sanitize before sharing; this viewer never uploads your file.
Why are response bodies missing?
Use "Save all as HAR with content" — the plain export omits bodies to keep files small.