Data File Converters — CSV, Excel & JSON
Convert between CSV, Excel, and JSON entirely in your browser, plus merge multiple CSV files together.
CSV to Excel
Turn a CSV file into a formatted Excel spreadsheet instantly — processed locally, nothing is uploaded or stored.
Excel to CSV
Turn an Excel sheet into a clean CSV file that opens in any app — processed locally, right in your browser.
CSV to JSON
Turn CSV data into a ready-to-use JSON array for your code — processed locally, right in your browser.
JSON to CSV
Turn a JSON array into a CSV file you can open in Excel or Sheets — processed locally in your browser.
Excel to JSON
Turn an Excel sheet into structured JSON data for any app or API — processed locally in your browser.
JSON to Excel
Turn JSON data into an Excel file organized in rows and columns — processed locally in your browser.
Excel to HTML
Turn an Excel sheet into an HTML table ready to publish on any webpage — processed locally in your browser.
Merge CSV
Stack multiple CSV files into one, in order, sharing the first file's header row — right in your browser.