Online CSV & JSON Converter
Convert between CSV and JSON with custom delimiters and header control. 100% private, all processing in your browser
Two-Way Convert
CSV to JSON and JSON to CSV
Privacy First
Your data never leaves your device
Flexible Delimiters
Comma, semicolon, tab, or pipe
Header Toggle
Include or skip the header row
Frequently Asked Questions
How does the CSV/JSON converter work?
In CSV to JSON mode, each row becomes an object keyed by the header row (or by column index). In JSON to CSV mode, an array of objects is serialized into rows with the object keys as the header.
Will my data be uploaded to a server?
No. All conversion is done locally in your browser. Your data never leaves your device, fully protecting your privacy.
Which delimiters are supported?
Comma (,), semicolon (;), tab, and pipe (|). Pick the one that matches your data, common in European spreadsheets that use semicolons.
What does the header toggle do?
When enabled, the first CSV row (or JSON object keys) is treated as field names. Disable it to use generic column names like col1, col2 for headerless data.
Is this tool free to use?
Completely free. This is a pure frontend online tool - no registration required, no payment needed, just open and use.
What JSON shapes are supported?
For JSON to CSV, provide an array of objects (or a single object). Nested objects and arrays are stringified into a single cell, while top-level keys become columns.
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