Private data workbench
Paste JSON or CSV to format and convert it.
Paste JSON or CSV into the input box below. This browser formats, converts, and cleans it without uploading it to a server.
Paste JSON or CSV
Enter JSON or CSV first.
Limits: 5 MB / 100,000 rows / 500,000 cells. CSV to JSON preserves strings by default; type inference is opt-in. Input and results stay in this browser.
Why this is private
- File reading, parsing, and conversion happen locally. No account or upload is needed.
- CSV quotes, line breaks, and delimiters are preserved; duplicate or empty headers receive stable names.
- Cells beginning with “=”, “+”, “-”, or “@” are reported, and saved CSV can prefix them to avoid spreadsheet formula interpretation.
- Results are saved only after you press the button. Input, file names, and results are not put in URLs or analytics events.
Safe export is a first check. Review sensitive or important data against the requirements of its destination.
CSV formula injection references: OWASP CSV Injection / RFC 4180