Convert CSV to JSON, free in your browser

Convert CSV or TSV rows into a JSON array of records using the first row as column names. Values remain text to preserve IDs and leading zeros.

How to convert CSV to JSON

1. Choose a CSV or TSV file.
2. Choose whether the first row contains column names.
3. Convert and download the JSON file.

Limits & good to know

• CSV and TSV files up to 50 MB are processed on your device.
• The first row contains headers by default; duplicate or blank headers are disambiguated.
• Rows are returned as JSON objects with string values.

Frequently asked questions

Are my files uploaded to a server?

Your files are processed on your device, not uploaded to our servers. Your file and edits are saved in this browser for recovery, and previous documents remain in Saved drafts when you open another file. Use Saved drafts to resume or delete individual copies, or clear this site’s browser data to remove all copies. Browser storage can be cleared or become unavailable; download important work.

Are numbers converted to numbers?

No. Values remain strings so leading zeros and long identifiers are preserved.

Is this really free, or free "until you hit a limit"?

Really free. Unlike most "free" PDF sites there is no task-per-day cap, no locked Pro features, no watermark stamped on your file, and no payment step before download. Every tool is the full tool.