How to use this office tool
Choose an Excel, CSV, or TSV file, select a sheet, and enter the first data row. The tool replaces non-empty data cells with masked text while retaining the header row.
#171 · Privacy Export & Printing Tool
Mask Spreadsheet Cell Values
Mask selected spreadsheet values in your browser and download a new XLSX copy while keeping the source file local.
Office File Tool
Local browser processingrow
rows
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What this tool does
The selected sheet is copied into a new workbook. Non-empty cells from the chosen starting row are changed to a same-length mask; formulas are replaced only when “Preserve formulas” is turned off.
The selected sheet is copied into a new workbook. Non-empty cells from the chosen starting row are changed to a same-length mask; formulas are replaced only when “Preserve formulas” is turned off.
Use a copy for sharing or review. Masking reduces casual exposure but is not cryptographic anonymization.
Supported formats
XLSX, XLS, CSV, and TSV are accepted where the operation supports them. Browser memory, parser support, and Excel worksheet limits apply.
| Format | Support |
|---|---|
| XLSX / XLS | Parsed locally; advanced workbook objects may not be preserved |
| CSV / TSV | Quoted fields supported; encoding is read by the browser |
Tips for better results
- Keep column headings outside the masking range.
- Review identifiers that may remain recognizable from length or pattern.
- Download and inspect the result before sharing it.
FAQ
Can I mask only data rows and keep spreadsheet headers?
Yes. Set the first data row so earlier rows remain unchanged.
Does masking permanently alter my original workbook?
No. The browser creates a separate XLSX download and does not overwrite the selected file.
Is masked spreadsheet data anonymous?
Not necessarily. Length, structure, and surrounding columns may still reveal information, so assess re-identification risk.
Are formulas masked too?
Formulas are retained when Preserve formulas is enabled; turn it off if formula cells must also be replaced.
Does the file leave my browser?
No. Processing occurs locally in the page and the tool does not upload workbook contents.
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Processing summary
| Stage | Action |
|---|---|
| Input | Validated and parsed locally |
| Output | A newly generated file is downloaded |
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