How to use CSV to JSON
- Load CSV and choose its delimiter and header behavior.
- Choose an array of objects or array of arrays plus pretty or minified formatting.
- Review the exact JSON before downloading it.
CSV to JSON Converter
Convert bounded CSV into an array of objects or arrays and download reviewed JSON locally.
Private by design. CSV and JSON stay in browser memory in this tab. Nothing is uploaded, logged, saved, or executed.
Maximum 16 MB · 50,000 rows · 500 columns · 1,000,000 characters per cell.
Numeric-looking IDs, ZIP codes, dates, and booleans remain strings.
Add CSV data, then process it.
Turn CSV records into JSON without silently converting IDs, ZIP codes, dates, or booleans into other types.
How OpenFileTools processes it
Local processing, explicit choices.
One shared deterministic parser handles UTF-8, BOM, quoted fields, escaped quotes, embedded line breaks, and explicit delimiter modes. Cells render only as text, and output is created locally after review.
Questions, answered.
Will 001 become the number 1?
No. CSV values are preserved as strings, so leading zeros remain intact.
Is the source uploaded?
No. Source data and generated output remain in browser memory in this tab.
Related guide
Read the related guide