The problem is not the file format
A HAR file is just a record of browser network activity. The risk comes from what modern web apps put into those requests and responses. Even when teams are careful, a support artifact can include details that should never be copied into a ticketing system or uploaded to a random analyzer.
That is why the safest default is local analysis. The file can be read in the browser, converted into a useful summary, and discarded without sending the raw contents to a server.
What local analysis should still provide
Keeping the file local should not mean the analyst gets a weaker workflow. A useful tool should still identify the incident time range, find likely correlation IDs, flag failed requests, mask sensitive values, and produce a summary that a product or support lead can act on.
The key distinction is that only license metadata needs to reach the backend. The HAR itself, including URLs, headers, cookies, bodies, account numbers, and correlation IDs, should stay inside the browser.
A better support handoff
The output should separate operational language from engineering evidence. A product manager needs to know whether the issue appears related to login, search, posting, completion, or finalization. Engineering needs the HTTP status, endpoint shape, failure signal, and correlation ID.
When those outputs are separated cleanly, teams avoid vague escalations and reduce the chance of pasting sensitive HAR content into a ticket.