CSV to JSON Converter
Processing entirely on your device — large files may take a moment.
CSV Spreadsheet and JSON Data exist for different jobs: CSV (Comma-Separated Values) is the universal spreadsheet export format: one table of rows and columns stored as plain text, opened by Excel, Google Sheets and every data tool. Convert tables to JSON when a website, app or API expects structured records with named fields.
This converter runs entirely in your browser using WebAssembly — your files never leave your device, nothing is uploaded, and there are no watermarks, sign-ups or queues. Drop in several files at once to convert them as a batch.
How to convert CSV to JSON
- 1
Select your files
Drag & drop your CSV files onto the area above, or click to browse. You can add multiple files at once for batch conversion.
- 2
Convert instantly
Click "Convert to JSON". The conversion runs entirely inside your browser using WebAssembly — no upload, no queue, no waiting.
- 3
Download results
Download each converted JSON file individually, or grab everything at once as a ZIP archive.
Frequently asked questions
Is this CSV to JSON converter really free?
Yes — completely free, with no sign-up, no watermark and no daily conversion limits. The site is supported by advertising.
Are my files uploaded to a server?
No. The conversion runs entirely inside your browser using WebAssembly, so your files never leave your device — that is what makes it instant and private.
Does it work on Windows, Mac, iPhone and Android?
Yes. Anything with a modern browser works: Windows, macOS, Linux, Android and iOS. No software installation is required.
What about special characters and non-English text?
Everything is handled as UTF-8. When you export CSV for Excel, a UTF-8 BOM is included automatically so Chinese, Japanese, Korean and accented characters display correctly on both Windows and macOS.