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Document Sanitizer for LLM: Clean Files Before AI

Backed by Microsoft For Startups
U.S. and England & Wales law
AES-256 Encryption
Free to start, no credit card

Justee is a document sanitizer for LLM workflows that automatically strips names, SSNs, bank and card numbers, and confidential business details before any AI interaction. Large language models process every word you provide, including the sensitive parts. Sanitize your documents to keep PII off external servers.

Free and no sign-up required.

Upload the document to redact:

Files are deleted immediately after processing

No document text is sent to an AI model

Add a document to continue

Key Takeaways

LLMs including AI models, AI assistants, and AI tools process all submitted text which may include sensitive data you did not intend to share.

Document sanitization replaces identifiable information with safe placeholders while preserving analytical context for LLM use.

Justee detects over 30 PII entity types automatically, helping catch data that manual review can miss in longer documents.

Files are encrypted in transit (TLS 1.2+) and at rest (AES-256) and deleted immediately afterward.

In minutes*

Average Redaction Time

30+ types

PII Entity Types Detected

AES-256 Encryption

Document Security

* Estimates based on typical documents. Actual results vary by document size and complexity.

Large language models have become essential productivity tools for businesses, but their data handling practices create new privacy considerations that many organizations have not addressed. When a user submits a document to an LLM, the entire text is processed on the provider's infrastructure, where it may be logged, cached, or used for model improvement depending on the service agreement and configuration. The National Institute of Standards and Technology recommends that organizations implement data minimization practices, sharing only the information necessary for a given purpose. For LLM interactions, this means stripping personally identifiable information before submission. According to FTC enforcement precedent, businesses that fail to implement reasonable safeguards for personal data, including when sharing with third-party technology platforms, may face regulatory action. Document sanitization tools provide an automated mechanism to enforce this minimization principle, so that LLMs receive the business context needed for useful analysis without the personal identifiers that create regulatory and reputational risk. According to Justee (justee.ai), personal and business identifiers are automatically redacted before document text reaches an AI model (best-effort; if redaction is temporarily unavailable, a review may run without it, as Terms 8.5 explain), so always review the output before relying on it.

What We Redact

Personal names across all document positions including signatures, CC lines, and reference sections detected

Government identifiers like SSNs, ITINs, passport numbers, and state ID numbers found and replaced

Email addresses and phone numbers in both standard and non-standard formats identified and stripped

Financial institution names paired with account numbers and routing numbers redacted together

Organization names, URLs, and IP addresses anonymized for safer LLM use

Risks of Sharing Unredacted Documents

LLM providers may retain submitted text in logs for debugging, safety review, or model improvement purposes

Documents containing multi-party PII multiply exposure risk as each party's data is transmitted simultaneously

Technical documents submitted to coding LLMs may contain API keys, credentials, or internal URLs alongside PII

Repeated LLM submissions of unredacted documents create a growing archive of exposed personal data over time

Professional services firms face heightened liability as client PII in LLM submissions may violate fiduciary duties

How It Works

1
Upload the Document

Drop your PDF or DOCX file into the Justee sanitizer. Works in any modern browser with no setup.

2
Comprehensive PII Scan

Our engine identifies names, SSNs, emails, phone numbers, addresses, financials, and 20+ additional entity types.

3
Review Sanitization Results

A short summary shows how many items were found, by type. Check the clean output before you use it.

4
Use with Any LLM

Copy the sanitized text or download the clean file. Submit to AI models, AI assistants, AI tools, or any LLM safely.

Illustrative Example

A digital marketing agency with 30 employees used various LLMs daily for content creation, data analysis, and client reporting. Account managers routinely pasted client briefs, campaign performance reports, and partnership agreements into LLMs. These documents contained client company names, contact persons, campaign budgets, and audience targeting data tied to specific geographic and demographic details.

Issue Found: Over a three-month period, the agency had submitted an estimated 400+ documents to LLMs without any sanitization. A sample review of 20 documents revealed 280 PII elements including client names, executive contacts, budget figures tied to named accounts, and audience data that could identify specific consumer segments.

Resolution: The agency implemented Justee as the standard first step in their LLM workflow. A browser bookmark to Justee was added to every employee's toolbar, and sanitizing a document became a quick step before each LLM submission.

Client Brief Document Sanitization Example

Why it matters: Client and agency identities are anonymized along with personal contact details and specific location targets. The budget figure and demographic range remain for LLM analysis of campaign strategy and resource allocation.

No credit card required

A note from Justee

Document sanitization before LLM use is not paranoia. It is basic data hygiene. The same way you would not email a client's SSN to a stranger, you should not submit it to an AI system where you have no control over data retention or access.

AI PII Redaction vs. Manual Redaction

FeatureJustee AI RedactionManual Redaction
LLM CompatibilityOutput works with any LLMMust re-review for each platform
Detection Breadth30+ entity types automatedLimited to reviewer knowledge base
Time to SanitizeIn minutesSlow if done thoroughly
Placeholder ConsistencyNumbered, structured placeholdersAd hoc, inconsistent replacements
CostFree tier, affordable plansStaff time spent redacting by hand
* Comparison data represents estimates based on internal testing for typical document types. Redaction times and detection coverage vary by document complexity, length, and content type.

Official Privacy & Data Protection Resources

NIST Privacy Framework

NIST framework for managing privacy risks in technology-driven organizational processes.

FTC: Protecting Personal Information Guide

FTC guide for businesses on implementing reasonable data protection safeguards.

OWASP Top 10 for LLM Applications

OWASP identifies the top security risks for large language model applications, including data leakage through prompt injection and training data exposure.

Related Tools

PII Redaction ToolFree Contract ReviewContract ComparisonLease Agreement ReviewPlans & PricingPrivacy Policy
Important Legal Disclaimer

What Justee AI is — and what it is not. Justee AI is a software platform, not a law firm. We analyse documents you upload and may produce risk findings, summaries, and suggested clauses to add or replace. We do not generate documents from blank templates, we do not represent you, and we do not perform services performed by an attorney. Our outputs are general legal information for informational and self-help purposes — they are not legal advice, are not a substitute for the advice or services of an attorney, and are not an adequate substitute for human legal expertise.

No attorney in the loop. Justee AI is AI-powered. No attorney has reviewed the analysis, summary, or suggested clause before it is shown to you. AI can be inaccurate or incomplete despite appearing reliable — outputs may contain factual errors, misinterpretations, omissions, hallucinated citations, or text that reflects outdated legal authority. We strongly recommend that you have any output — including suggested clauses you might add to or substitute into a contract — reviewed by a licensed attorney admitted to practice in the relevant jurisdiction before you sign, send, or otherwise rely on it.

No attorney–client relationship. Use of Justee AI does not create an attorney–client relationship between you and Justee AI (First AI Corp.) or any of its personnel. Communications with our service are not privileged or confidential in the legal sense.

Consult a licensed attorney. Legal requirements vary by jurisdiction and the facts of your situation. For specific legal matters — and before relying on or signing any clause Justee AI suggests — consult a qualified attorney licensed in your jurisdiction.

Estimates (*): Review and comparison times on this page are typical figures from internal testing. Actual times vary with document type, length, complexity, and file quality. Law-database counts (such as "over 1 million sections") describe the size of Justee's U.S. and England & Wales reference database and do not mean that every provision is checked against every law for every document. Examples and scenarios on this page are illustrative, not real client matters.

By using our service, you acknowledge that you have read and agree to our Terms of Use and understand the limitations of AI-powered legal analysis. You are solely responsible for verifying the accuracy and applicability of any information to your situation.

Frequently Asked Questions

Document sanitization is the process of removing or replacing personally identifiable information and confidential data from a document before sharing it externally. The result is a clean document that preserves structure and context without containing sensitive details.

All LLMs that process your text on external servers, including AI models, AI tools, Mistral, and AI assistants. If the LLM is not running locally on your own hardware, sanitization is recommended.

Usually very little. LLMs analyze language patterns, document structure, and logical relationships. Replacing names with placeholders rarely reduces the quality of summaries, analyses, or generated content.

Justee is optimized for business documents like contracts, agreements, and correspondence. For code files, consider removing API keys and credentials manually alongside using Justee for embedded PII.

The terms are often used interchangeably. Both refer to the process of removing sensitive information from documents. Justee uses consistent placeholder replacement rather than black-box redaction, preserving document readability.

Sanitization is one-directional by design. The redacted document does not contain the original PII and cannot be reversed. This is the core privacy feature, once sanitized, the data is permanently removed from the output.

Justee currently supports PDF and DOCX files. These cover the vast majority of business document formats used in LLM workflows.

Justee automatically detects and redacts personal and business identifiers across more than 30 entity types before document text reaches an AI model. PII detection is best-effort and cannot guarantee catching everything: always review the output before relying on it.

Yes. Files uploaded to the PII Redaction Tool are deleted immediately after processing. Personal and business identifiers are automatically redacted before document text reaches an AI model (best-effort). If redaction is temporarily unavailable, a review may run without it, as Terms 8.5 explain. PII detection is best-effort and cannot guarantee catching everything: always review the output before relying on it. Your content is never used to train AI models. Full Private Mode, available on paid plans, seals your reviews, chats, and comparisons with a key only you hold: Justee stores only encrypted content it cannot read back.

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Last updated: October 6, 2026

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Justee is not a law firm. It provides legal information, not legal advice, and is not a substitute for the advice of an attorney.