Is my HAR file uploaded anywhere?

No. HAR files often contain cookies, auth headers and request bodies, so this viewer reads the file with the local FileReader API and parses it in your browser — nothing is sent over the network.

What does each column show?

For every request you see the HTTP method, response status, content type, response size and total time in milliseconds, plus the full URL.

Why is a request size shown as a dash?

Some HAR exports record a size of -1 when the body was not captured (for example cached or blocked responses). Those are shown as a dash and excluded from the total.

HAR File Viewer — Gera Tools

View HAR captures privately

A HAR file is a JSON record of the network requests your browser made, exported from the DevTools Network tab. This viewer opens it locally and lays every request out in a table — method, status, type, size and timing — so you can spot slow calls, errors and oversized responses.

Because HAR files frequently include cookies, authorization headers and full request bodies, privacy matters: this tool parses the file entirely in your browser and never uploads it.