🔀 Data Conversion Tools

Convert between CSV, JSON and Excel formats — 4 free tools, no signup required.

CSV to JSON Converter

Convert CSV data into JSON arrays or objects.

JSON to CSV Converter

Flatten JSON arrays into downloadable CSV spreadsheets.

Excel to CSV Converter

Convert Excel .xlsx spreadsheets into plain CSV files.

CSV to Excel Converter

Turn CSV files into formatted Excel .xlsx workbooks.

Free Data Conversion Tools — CSV, JSON and Excel

Data constantly needs to cross the border between two worlds: the spreadsheet world where humans work (Excel, CSV) and the structured world where software works (JSON, APIs, databases). These four converters move data across that border in both directions, handling the encoding traps, delimiter quirks and type-casting details that make naive conversions fail.

The CSV to JSON Converter turns spreadsheet exports into API-ready JSON — header rows become object keys, quoted fields with embedded commas parse correctly, and numeric values become real numbers. Its mirror, the JSON to CSV Converter, flattens API responses into Excel-openable tables, converting nested objects into dotted columns and unifying inconsistent keys automatically.

For native spreadsheets, the Excel to CSV Converter extracts any worksheet from an .xlsx workbook with formulas exported as their computed values, and the CSV to Excel Converter builds formatted workbooks with bold headers, auto-sized columns and — crucially — leading zeros preserved, dodging Excel's infamous habit of turning ZIP code 01234 into 1234.

Developers use these tools for test fixtures and migrations, analysts for reshaping exports, and office teams for making API data readable — all without writing a single parsing script.