Private spreadsheet handoff

Turn CSV or Markdown tables into safer Excel files.

Import, inspect column types, and save a real `.xlsx` in this browser. Leading zeros, long identifiers, and Japanese text stay intact by default.

Import a table

CSV or Markdown table

Load from a file

The file is read locally. Nothing is processed automatically.

Encoding

Delimiter

File name

Sheet name

Text is the default. Choose only columns that you have checked as safe numbers. Limits: 5 MiB / 10,000 rows / 100 columns / 500,000 cells.

Enter a table, then inspect it.

Columns are text by default. Values such as 00123, 16+ digit IDs, and date-like text are not guessed into numbers.
Formula-looking cells are warned about and never generated as spreadsheet formulas.
The output is one local worksheet. Input, result, and file name are not sent or stored.

After saving, confirm values and display in Excel or the system that receives the file.