PII Redaction Software for Word, Excel and PDF
Remove sensitive values on your own computer before AI review, external sharing or compliance handoff. Keep relationships readable with reversible aliases.
Updated June 17, 2026. Windows 10/11. 14-day free trial, no credit card.
DocMask is for the messy middle: documents that are too sensitive to upload raw, but still need to be summarized, reviewed, classified or transformed. It replaces PII with stable aliases and stores the mapping locally so you can restore the final answer when the work is done.
PII DocMask is built to catch
Contact data
Email addresses, phone numbers and custom contact names or team aliases.
Identifiers
National or business ID patterns, account references, IP addresses and custom project codes.
Financial values
Payment card numbers, IBANs and finance-specific terms you add as custom keywords.
Detection is not a magic promise. Always review the side-by-side preview and add domain-specific custom keywords for names, patient IDs, matter numbers, invoice prefixes or internal project codes.
Why local PII redaction matters for AI
AI assistants are useful because they can read long documents quickly. That also means they receive the sensitive values inside those documents unless you remove them first. Local PII redaction changes the default: the AI sees the structure, but not the original values.
| Workflow | Traditional redaction | DocMask reversible redaction |
|---|---|---|
| Publish final PDF | Good fit when irreversible deletion is required. | Useful only if you need aliases, not a replacement for legal publication review. |
| Ask AI to summarize | Often harms context because everything becomes black bars. | Stable aliases preserve who did what while hiding real values. |
| Restore AI answer | Manual and error-prone. | Paste the answer back and map aliases to originals locally. |
| Compliance review | Depends on tool, upload path and retention promises. | Document content and mapping vault stay on the local machine. |
Best-fit teams
- Legal teams reviewing contracts, discovery notes and matter summaries with AI assistance.
- HR teams summarizing employee documents without exposing names, emails and payroll values.
- Finance teams preparing invoice, account or reconciliation data for analysis.
- Healthcare and research teams minimizing patient or participant identifiers before external review.
- Consultants and agencies working with client documents under confidentiality clauses.
How to evaluate PII redaction software
Ask these before buying
- Does the file leave the device during redaction?
- Can the tool handle Word and Excel, not just PDF?
- Can users review each replacement before export?
- Does it preserve enough structure for AI reasoning?
- Can claims be verified beyond marketing copy?
DocMask publishes an audit page so buyers can verify core privacy and engineering claims instead of relying on slogans.