Network & Security · Local-first
HAR Viewer Online
Open a HAR file and summarize requests, timing, sizes and failures locally.
Open HAR ViewerFree · No sign-up · Browser-based processing
What HAR Viewer does
Open a HAR file and summarize requests, timing, sizes and failures locally. The utility is designed for quick, focused work without requiring an account or installing another application.
Common uses
- Troubleshoot network and security configurations
- Check values before production changes
- Generate repeatable outputs for documentation
How to use HAR Viewer
- Enter or paste the value you want to process in HAR Viewer.
- Run the tool and review the generated result for the expected format.
- Copy or download the result and verify it in the system where it will be used.
Privacy: Runs locally in your browser. Input is not uploaded to the DevNet Kit server.
HAR Viewer FAQ
Does HAR Viewer require an account?
No. The tool is available without registration.
Is HAR Viewer local or remote?
Processing runs in your browser and the input is not uploaded to the DevNet Kit server.
Can I use it on mobile?
Yes. The interface is responsive, although large inputs are usually easier to inspect on a desktop screen.