CSV to JSON Converter
Convert CSV to JSON and JSON to CSV, with a live table preview.
- Free, no sign-up
- Files stay on your device
- Works offline
How to use the CSV to JSON Converter
- 1
Choose CSV → JSON or JSON → CSV.
- 2
Paste your data or drop a .csv / .json file.
- 3
Adjust the delimiter, header row and type detection if needed.
- 4
Check the table preview, then copy or download the result.
Frequently asked questions
Everything you need to know about the CSV to JSON Converter.
Does it handle commas and line breaks inside values?
Yes. The parser follows RFC 4180, so quoted fields can contain commas, line breaks and escaped double quotes ("").
Which delimiters are supported?
Comma, semicolon, tab and pipe. The delimiter is detected automatically from the first line, and you can override it.
Why are some numbers kept as text?
Values with leading zeros (like 007 or phone numbers) and numbers too large to store exactly are kept as strings, so no data is lost. Turn off type detection to keep every value as text.
Is my data uploaded?
No. Conversion happens entirely in your browser, so it's safe to use with private spreadsheets and exports.