Spreadsheet File Toolbox
Preview XLSX and CSV locally in the browser, export worksheets, merge workbooks, or split worksheets into a compressed archive of XLSX files.
How to use the spreadsheet toolbox
Spreadsheet files are only read, converted, and exported in the current browser’s memory, and are not uploaded.
Load spreadsheet file
Select up to 20 XLSX or CSV files; each file must be no larger than 32 MiB, and the total must not exceed 96 MiB.
Preview or organize spreadsheets
Switch between workbooks and worksheets to view up to 100×50 cell previews, or choose to merge workbooks and split by worksheet.
Export and verify
Export the current worksheet as CSV, JSON 2D array, HTML, Markdown, or XLSX, or download the split ZIP.
Limitations and Notes
- Only .xlsx and .csv are supported; old .xls files, password-protected files, and macros are not supported; loading XLSX will not execute macros either.
- Single-sheet XLSX exports and splitting can preserve formulas and cached values but will not recalculate them; to avoid reference breakage caused by renaming, merging will reject workbooks that contain formulas or defined names.
- Each workbook can have up to 100 worksheets, with 100000 rows per sheet and 500 columns per sheet, for a total valid area of up to 1000000 cells.
FAQ
What should I do with worksheets with the same name when merging workbooks?
The tool will generate unique names for worksheets with the same name and preserve each worksheet’s content for verification after download.
Why isn’t the preview showing all data?
To control page performance, the preview shows at most the first 100 rows and 50 columns; export still processes the full worksheet within the allowed range.
Can cells be edited or formulas recalculated?
No. This tool focuses on previewing, converting, merging, and splitting; it is not a full spreadsheet editor or formula engine.