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CSV ↔ JSON Converter
Convert between CSV and JSON locally with custom delimiters and quoting, no upload, no limits.
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About CSV ↔ JSON Converter
CSV is the lingua franca of spreadsheets and database exports; JSON is the standard for APIs and modern data interchange. Converting between them is a daily chore for analysts and developers.
This tool converts both directions entirely in your browser. Configurable delimiters, header detection and proper quoting are supported.
Frequently asked questions
Are my files uploaded?
No. The conversion runs locally, files never leave your device.
Does it handle quotes and embedded commas?
Yes. The CSV parser implements RFC 4180 quoting rules including escaped quotes inside quoted fields.
What's the size limit?
Limited only by your browser's available memory. Very large files (100+ MB) may freeze the tab, split them first.
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