Masking a customer export before sharing
email column set to "email-aware", phone column set to "partial"
j••••@example.com instead of a real address, and only the last 4 digits of each phone number visible.
Spreadsheet Data Masking
Mask sensitive columns in an Excel or CSV file before sharing it — full, partial, hashed or email masking.
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About this tool
Sharing a real spreadsheet for a demo, a bug report or a support ticket usually means sharing real customer data along with it — unless the sensitive columns are masked first. This applies a masking strategy per column and never uploads the file to do it.
How to use it
- Upload an Excel or CSV file.
- For each column, pick a masking strategy: full (all dots), partial (keep the last 4 characters), a consistent hash (same input always masks the same way, useful for joins), or email-aware (keeps the domain, masks the local part).
- Preview the masked rows, then download the result as CSV or Excel.
Examples
Common problems
- The hash strategy produces something that still looks reversible.
- It's a short, non-cryptographic hash meant for consistent-looking pseudonyms and safe joins between masked files — not real de-identification. Don't rely on it where an irreversible, audited anonymization process is actually required.