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Spreadsheet Editor

Edit CSV and XLSX spreadsheets in your browser

About Spreadsheet Editor

The Spreadsheet Editor is a lightweight online spreadsheet that works entirely in your browser. Open CSV or XLSX files, edit cells, apply basic formulas and formatting (bold, italic, alignment), add or remove rows, columns and sheets, sort data, then export the result back to CSV or XLSX. Nothing is uploaded — your data stays on your device.

Frequently Asked Questions

Which file formats are supported?

You can import CSV and XLSX files and export back to either format. Multi-sheet workbooks are preserved when importing and exporting XLSX.

Which formulas are supported?

A wide range of common Excel functions are supported: aggregation (SUM, AVERAGE, MEDIAN, STDEV…), math (ROUND, TRUNC, SUMPRODUCT, POWER…), text (UPPER, LEFT, REPLACE, TEXTJOIN…), logic (IF, IFS, SWITCH, AND, OR…), lookup (VLOOKUP, HLOOKUP, INDEX, MATCH), date (TODAY, DATE, WEEKDAY…) and multi-criteria (SUMIFS, COUNTIFS…). Circular references are detected and reported.

Is my spreadsheet uploaded?

No. All parsing, formula evaluation and export happen locally in your browser. Your spreadsheet never leaves your device.