Convert CSV and JSON

How to use this tool

1. Choose a direction and paste data.
2. Check delimiter, header and formula-protection options.
3. Review row/column errors or download the result.

A cell containing a comma

Input and settings

name,note Alice,"Hello, world"

Result

[{"name":"Alice","note":"Hello, world"}]

CSV cells remain strings in JSON, even if they look numeric.

Processing rules and reading the result

Quoted fields support delimiters, embedded line breaks and doubled quotes. JSON→CSV accepts arrays of objects or equal-width arrays and rejects nested objects. Without headers, CSV→JSON produces arrays of arrays.

Limits and checks before use

Limits are 500,000 input characters, 5,000 data rows, 100 columns and 2 million output characters. Quote precision-sensitive JSON values/IDs. Formula protection prefixes an apostrophe to strings beginning with = + - @, changing the original cell.

Common questions