PII Masker Learn more

Mask sensitive fields before sharing samples — reduce risk while still getting help. Runs locally in your browser.

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Upload

CSV / TSV / XLSX / XLS (first sheet used)

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Delimiter Preview rows

Safety: your file is read locally in your browser. Use Masker if you need to share samples.

Privacy: processed locally in your browser. Nothing is uploaded unless you choose to share details for help.

Run summary

How many fields were masked

Rows: — Cols: — Masked cells: 0 Rule hits: 0 Salt:—

Tip: Use a salt for stable tokens (same email → same token) across exports.

1) Quick rules

Auto-detect common PII patterns

Email

mask anything that looks like user@domain

Phone

mask common phone formats (best-effort)

SSN

mask patterns like 123-45-6789

Card numbers

mask 13–19 digit sequences (validated by Luhn)

Address-like

mask lines that look like street addresses

Scan free-text columns

apply rules inside any text field

2) Column controls

Force mask specific columns (even if patterns aren’t detected)

Auto-pick tries common names: email, phone, mobile, ssn, dob, address, card, account, member, patient, etc.

3) Masking style

Choose how masked values appear

Strategy

Token prefix

Salt (optional)

Keep empty values unchanged

blank stays blank

Trim whitespace

helps prevent missed matches

Preview

Before vs after (first N rows)

Audit notes

What rules matched

Load a file, pick rules, then run masking to generate an audit.

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PII Masker

What this helps with

Redact sensitive columns
Mask values while preserving shape
Prepare files for sharing safely
Reduce compliance risk

Common causes

Need external review but data is confidential
PII/PHI/financial fields in exports
Policies require redaction before sharing

What to do next

Mask before you upload/share
Then run Compare/Reconcile on masked copies if needed
If you need guidance, use Fix My Report