Spreadsheets mix labels, numbers and formulas. You usually want 客户 to become 客戶 without turning =SUM(B2:B20) into a string. Converting an .xlsx file as a workbook is built for that: change Chinese cell text, leave the grid alone.
ChineseDocConverter accepts Excel workbooks and converts Chinese it finds in the file. Numbers, dates and formula syntax should remain spreadsheet data.
What to watch
- Header rows and sheet names may contain Chinese and should be checked after conversion.
- Data validation lists and chart titles can hide extra strings.
- If a cell looks Chinese but is actually an image, it will not convert.
Regional vocabulary
Taiwan and Hong Kong may prefer different words as well as different characters. OpenCC types that include "phrases" try to handle some of that. Read Taiwan vs Hong Kong Traditional Chinese before you pick an option.
Workflow
Upload the .xlsx file to the document converter, convert it, then open the download and check a sheet with both Chinese labels and formulas.