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Excel & Spreadsheet Redaction

Protect sensitive data in spreadsheets before sharing

4 min readAuthor: Redactorr Support Team · [email protected]Last reviewed: March 2026

Keeping Your Spreadsheets Safe

Spreadsheets are data powerhouses - they hold everything from customer lists to financial records. But that's exactly why they're so risky to share.

Why Spreadsheets Are Extra Risky

Unlike text documents, spreadsheets pack sensitive information into structured tables where:

  • Every cell could contain private data
  • Formulas might reference sensitive information
  • Hidden sheets might contain data you forgot about
  • Comments and notes might have personal information
  • Cell formatting might reveal information through patterns

A Common Scenario

You need to share a sales report with your marketing team, but the spreadsheet contains:

  • Customer email addresses and phone numbers
  • Individual salesperson commission rates
  • Client company names and addresses
  • Internal account IDs
  • Personal notes in cell comments

You want to share the overall trends and totals, but not the private details.

How Redactorr Handles Spreadsheets

Upload Your File**

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Drop your .xlsx or .xls file into Redactorr for browser-local detection and redaction.

Sheet-by-Sheet Scanning**

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Redactorr processes:

  • Every visible sheet
  • Hidden sheets (you'll get a warning)
  • All cells, even empty-looking ones with formulas
  • Cell comments and notes

Pattern Detection**

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The system finds sensitive data like:

  • Email addresses in contact columns
  • Phone numbers in customer records
  • Social Security Numbers in employee data
  • Credit card numbers in transaction logs
  • Custom patterns you define (like account IDs)

Smart Replacement**

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Sensitive data gets replaced with redacted items, but:

  • Numbers stay as numbers (so formulas still work)
  • Dates stay as dates
  • The table structure is preserved
  • Cell formatting remains intact

Export Options**

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Choose your format:

  • Clean .xlsx (same format, works in Excel)
  • CSV (universal format, works everywhere)

What Gets Preserved?

  • Row and column structure
  • Cell formatting (colors, borders, fonts)
  • Formula logic (though referenced data is redacted)
  • Sheet names
  • Table structure

Pro Tips

Check Hidden Sheets: Before processing, unhide all sheets to see what you're working with. Hidden sheets might contain forgotten sensitive data.

Test Formulas: After redaction, check that your formulas still calculate correctly with the redacted data.

Use CSV for External Sharing: If sharing outside your organization, export as CSV - it's a universal format that doesn't carry extra metadata.