Your data never leaves your device

CSV → JSON converter

First row becomes the keys, every other row becomes an object. Ready for APIs and code.

Drop a CSV file here or click to select

First row = JSON keys · legacy encodings repaired automatically

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Private by design — every conversion runs inside your browser (JavaScript), so your data is never uploaded anywhere. Safe for customer lists, sales figures and personal data. It even works offline.

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Frequently asked questions

Is the first row used as the header?

Yes. Values in the first row become the object keys and data starts from row two. Duplicate keys get _1, _2 suffixes.

Do numbers come out as strings?

No — values recognized as numbers stay numeric (123, not "123"), and empty cells become null.

My Korean/legacy CSV shows garbled characters

Many CSV files saved by older spreadsheet apps use legacy encodings such as EUC-KR (CP949). sheetmoa first reads your file as UTF-8 and, if it detects broken characters (�), automatically retries with the EUC-KR decoder. Legacy .xls files are read with codepage 949 as a fallback too. If it still looks wrong, re-save the file as "CSV UTF-8" in Excel.

Is my data uploaded to a server?

No. Every conversion runs inside your browser and your file is never sent over the network. Safe even for customer lists and confidential spreadsheets.

Is it free?

Completely free — no limits on file count or size, and no sign-up.