Import sensitive material
Drop in PDFs, Word files, Excel files (XLSX, XLS, XLSM), CSV files, screenshots, scans or pasted text without sending the originals to a web service.
Local offline redaction software
LocalMask
Prepare sensitive documents before AI analysis, external sharing and review.
Redact and anonymize PDFs, Word files, Excel files (XLSX, XLS, XLSM), CSV files, images, scans and text on your computer. Keep useful context with aliases, review every hit, then export a clean copy.
Core processing runs locally
Review before export
Export redacted copies
AI needs context, not raw identifiers
Redact the document, keep the structure.
Review detected entities
Inspect names, organizations, business identifiers, accounts, addresses, postal codes and visual targets before exporting a redacted copy.
Keep context for AI
Use stable aliases such as Person A and Company A so AI can reason without seeing direct identifiers.
Redaction modes
Choose the output that fits the handoff.
LocalMask can keep context with aliases, obscure only part of a value, hide it completely, or leave a blank placeholder for a cleaner document. Redaction-area colors can also be customized.
Alias replacement
Replace repeated sensitive entities with stable labels while keeping relationships readable.
John Smith Person A
Partial masking
Keep a small amount of context at the edges while masking the middle of IDs, accounts or phone numbers.
+1 415 555 0198 +1 415 **** 0198
Full masking
Mask the full detected value when exported material should not expose readable source text.
AB123456 ********
Blank placeholder
Replace the detected content with blank space when the output should look closer to manual removal.
Acme Holdings Ltd.
Custom transformations
Dates and amounts can be changed by rule, not only hidden.
Custom date shift
Move detected dates by a consistent number of days, months or years while preserving sequence.
Jan 1, 2026 Jan 24, 2026Signing date Shifted date
Custom amount formula
Apply add, subtract, multiply or divide rules so amounts remain useful without exposing exact values.
$10,000 $12,000$1M $1.2M
Why not just use a PDF editor or PII framework?
Built for document work, not just detection.
LocalMask is designed for people who need a usable redaction workspace: import, detect, review, alias, export and restore AI output from the local mapping.
Desktop workflow instead of a developer-only PII API
PDF, Word, Excel, CSV, scan and image handling instead of prompt text only
Local review and export before AI analysis or external sharing
Alias mapping stored locally for restoring AI-generated output
Common workflows
For legal, finance, risk, audit and operations teams.
Legal and compliance review
Prepare contracts, letters, case files, evidence packages and client documents before outside sharing or review.
Finance, risk and audit material
Handle bank statements, accounts, card numbers, transaction records, credit material, audit workpapers and financial reports before export or AI analysis.
Business operations
Redact HR records, payroll files, invoices, reimbursement material, procurement files, screenshots and internal reports in one desktop workflow.
Download
Install LocalMask for your desktop.
Download the desktop build for Windows or macOS. A license is required for activation after purchase.
Frequently asked questions
Does LocalMask need an internet connection?
No. LocalMask is built for local desktop use. Document import, detection, review, redaction, export and activation run on your computer. Internet access is only needed to download the installer or purchase a license.
Can LocalMask be used on an internal network without public internet access?
Yes. LocalMask does not rely on a cloud redaction service. After installation and offline activation, it can be used on an internal network, in a no-public-internet environment or offline. Detection, review, redaction, export and alias mappings are processed on the local computer.
Will my original files be uploaded?
No. Original files, detection results, review decisions and alias mappings stay in your local workspace. LocalMask does not upload your source documents to a cloud redaction service.
Which operating systems are supported?
LocalMask supports Windows x64, macOS Apple Silicon and macOS Intel. Windows 10 64-bit or later is recommended. On macOS, use macOS 12 Monterey or later.
What file types can LocalMask handle?
LocalMask supports PDFs, Word documents (DOC and DOCX), Excel files (XLSX, XLS, XLSM), CSV files, TXT, Markdown, screenshots, scanned pages, image-based PDFs, images and clipboard text.
Can LocalMask handle password-protected PDF and Word files?
Yes. Passwords are verified and used only on the local computer. The correct password is required; LocalMask does not bypass or crack unknown passwords.
Is LocalMask suitable before using AI tools?
Yes. You can redact or replace direct identifiers locally before sending content to AI tools, cloud services, web forms or external collaborators. Stable aliases keep enough context for analysis without exposing raw identifiers.
Does it preserve document layout?
LocalMask tries to preserve the original layout when exporting redacted copies. Complex scans, unusual PDF structures and heavily formatted documents should still be reviewed before delivery.
Is the redaction just a visual overlay?
No. LocalMask focuses on content-level redaction for exported copies, processing text layers and image pixels instead of only drawing a visible box on top of the page.
Can LocalMask remove watermarks?
Yes. LocalMask can clean common watermarks, comments and annotations.
Can I restore aliases after AI output?
Yes. LocalMask can replace sensitive entities with stable aliases and keep the mapping locally, so AI-generated text containing those aliases can be restored on your computer.
Do I still need manual review?
Yes. LocalMask assists with detection and redaction, but users should review matches before export to confirm the redaction scope and final output meet their use case.
How does licensing work?
After purchase, enter the machine code shown in LocalMask. The license key is sent by email after payment confirmation and is used to activate LocalMask on the licensed device.