Free online Excel to CSV and JSON converter
Turn a spreadsheet into clean, usable data in seconds. Upload an .xlsx, .xls, or .csv file, choose CSV or JSON as the output, and get the result ready to copy or download. It is the fastest way to pull tabular data out of Excel for use in code, an API, a database import, or another app — with no formulas, macros, or manual retyping to worry about.
How to convert an Excel file
- Click Select Excel / CSV File and choose your workbook.
- Pick CSV for a plain comma-separated file, or JSON for an array of objects keyed by your column headers.
- Click Convert File to generate the output.
- Copy the result to your clipboard or download it as a file.
The first sheet of the workbook is used, and its header row becomes the field names when you convert to JSON.
Common uses
- Preparing spreadsheet data for a JSON API or config file.
- Exporting an Excel sheet to CSV for a database or bulk import.
- Converting a client's
.xlsxinto a format a script can read. - Flattening a CSV into structured JSON objects.
Processed locally — your files stay private
Conversion happens entirely in your browser using the SheetJS library, so your spreadsheet is never uploaded to any server. That matters for financial reports, customer lists, and other sensitive data: the file never leaves your device, and nothing is stored or tracked.
Once you have JSON, tidy and validate it with our JSON formatter and converter, or turn it into a compact, token-friendly format for LLM prompts with the JSON to TOON converter.
Need a custom tool or internal utility built for your team? Get in touch with SR Infobiz.