Data
XLSX test files, any size.
Set a size and generate a structurally valid XLSX immediately. Nothing is uploaded and nothing is stored.
XLSX, built to spec.
Each file is a workbook with one sheet, readable by Excel and openpyxl. The size you ask for is reached with a binary part inside the package, outside the sheet data, so the result opens in Microsoft Excel, LibreOffice Calc, Numbers and openpyxl. Most people generate these for testing spreadsheet imports and bulk-upload endpoints.
Common sizes
Pick a size to jump straight to it, or set your own on the caliper above.
5 KB XLSX
5,120 bytes
10 KB XLSX
10,240 bytes
50 KB XLSX
51,200 bytes
100 KB XLSX
102,400 bytes
500 KB XLSX
512,000 bytes
1 MB XLSX
1,048,576 bytes
2 MB XLSX
2,097,152 bytes
3 MB XLSX
3,145,728 bytes
5 MB XLSX
5,242,880 bytes
10 MB XLSX
10,485,760 bytes
15 MB XLSX
15,728,640 bytes
20 MB XLSX
20,971,520 bytes
25 MB XLSX
26,214,400 bytes
50 MB XLSX
52,428,800 bytes
100 MB XLSX
104,857,600 bytes
200 MB XLSX
209,715,200 bytes
500 MB XLSX
524,288,000 bytes
1 GB XLSX
1,073,741,824 bytes
2 GB XLSX
2,147,483,648 bytes
Questions.
How small can an XLSX file be?
About 2,439 bytes. Below that the format cannot carry its mandatory structure, let alone padding.
Will the file open normally?
Yes — it opens in Microsoft Excel, LibreOffice Calc, Numbers and openpyxl, because the padding lives in a binary part inside the package, outside the sheet data.
Can I ask for an unusual size?
Any byte count above the minimum works, including values like 3,145,728 or 27.5 MB. Drag the caliper or type the number.
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