CSV to JSON Converter
Turn spreadsheet rows into JSON records without changing cell text.
Converted in your browser. Your file never leaves your device.
Drop your CSV files here
or drag and drop · 10 MB per file
How to convert CSV to JSON
- Choose UTF-8 CSV files up to 10 MB.
- Review the conversion report for changed or unsupported values.
- Download the JSON result, or save the batch as a ZIP.
Where this file comes from
CSV exports from Excel, Google Sheets, and databases use a first row of column names.
What changes in the conversion
The first row becomes object keys. All values remain strings, including dates and leading zeros. Empty or duplicate headers and uneven rows are rejected.
Size limits and browser notes
- Accepts .csv files up to 10 MB each.
- You can convert several files at once; they download together as one ZIP.
- Everything runs in your browser, so very large files depend on your device's memory.
Large or deeply nested documents may exceed browser memory. Use files up to 10 MB. Invalid input is rejected without including its contents in errors.
FAQ
Can numbers remain strings?
Yes. Every cell stays a string so identifiers, leading zeros, and date text survive.
Does this work offline?
Conversion runs locally after the converter and required libraries have loaded. Files are not uploaded.
What encoding is supported?
UTF-8, with or without a byte-order mark. Export legacy encodings as UTF-8 first.
Related tools
See every tool on the Spreadsheet & Data Converter page.