Free browser tool
Convert CSV to JSON
Turn a flat CSV into a JSON array. Values are not guessed or converted to numbers.
Your file stays on this device. No upload, account or tracking.
Use the tool
Paste text or choose a UTF-8 file. Up to 600,000 characters, 5,000 data rows and 100 columns.
Result
The preview may be shortened on screen. The download contains the complete result.
What this tool does
Convert CSV rows to JSON objects locally while preserving every cell as text.
Limits and safe use
Up to 600,000 characters, 5,000 data rows and 100 columns. Keep the original file and review the output before using it elsewhere. This tool does not certify an import, infer missing meaning or send data to a model.