Data converter · runs 100% in your browser

HAR to JSON Converter

Convert HAR (HTTP Archive) network log files to clean, formatted JSON in your browser. HAR files are already JSON internally; this tool prettifies and standardises them for analysis. Useful for inspecting network bottlenecks captured from browser DevTools.

No uploadNo signupNo trackingFree, unlimited
Drop your HAR file here
or click to choose a file

How to use

  1. Drop your HAR file (or click to browse).
  2. The converter parses the file locally in your browser.
  3. JSON output is built in memory and offered for download.
  4. Click Download to save the JSON file.

FAQ

Does my data file upload to a server?

No. Conversion runs entirely in your browser using WebAssembly and Web APIs. Open the Network tab in DevTools while you convert — you'll see no outbound traffic carrying your file.

Is this really free?

Yes. No signup, no quota, no upgrade tier. The conversion runs on your machine, so it costs us nothing to host.

Is there a file size limit?

Browser memory is the only ceiling. On a modern desktop browser, a few hundred megabytes works fine. Mobile devices have tighter limits.

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