How to use CSV to JSON
- Paste CSV or open a file.
- Check the delimiter and header options.
- Press Convert to JSON, then copy or download.
Questions
Does it handle commas inside quotes?
Yes. Quoted fields, escaped quotes ("") and line breaks inside quotes are all parsed correctly.
Why are some values numbers and others text?
With Detect numbers ticked, values like 42 or 3.5 become numbers and true/false become booleans. Untick it to keep everything as text, for example for zip codes with leading zeros.
Is my data uploaded to a server?
No. The tool runs in your browser and works on your data directly on your device. Nothing is sent to us or anyone else, which is why it also keeps working if your connection drops after the page loads.
Last updated 13 November 2026.