Document Anonymizer

About Document Anonymizer

Document Anonymizer is a zero-knowledge, client-side privacy tool that allows individuals, professionals, and organizations to safely anonymize sensitive text or documents directly in their browser — without uploading, transmitting, or storing any data on external servers.

The system works entirely within the user’s device. When a document is pasted into the anonymizer, it automatically detects personal identifiers such as names, emails, phone numbers, dates, addresses, financial values, and other sensitive information. These are replaced with realistic synthetic data — names, addresses, and values that look authentic but contain no traceable link to the original source. The user may then safely share or process this anonymized version (for example, with AI models, partners, or reviewers) without risking privacy violations.

For every anonymized text, the system generates a secure, AES-256-GCM–encrypted mapping block, which is optionally embedded directly within the shared document. This map can later be used, along with the same private passphrase, to restore the original document. Both the map data and the passphrase remain fully under the user’s control. Neither is ever uploaded, stored, cached, nor shared by the system.

Core principles:

• 100% client-side operation — zero data leaves the user’s device.
• Strong encryption (AES-256-GCM + PBKDF2-SHA512, 200,000 iterations).
• No databases, no cookies, no logs, no tracking.
• Works instantly in any modern browser, even offline.
• Self-contained: no external APIs, networks, or third-party dependencies.

Purpose:

Document Anonymizer is designed to empower users with privacy-first tools to prepare, anonymize, and share sensitive content securely. It enables responsible AI use, data sharing, and research collaboration while maintaining ethical and legal compliance with privacy principles such as GDPR, CCPA, and data minimization.

Privacy Policy

Effective Date: January 1, 2025

Last Updated: January 1, 2025

1. Data Handling and Processing

Document Anonymizer processes all text and data locally within your browser. No information, including the text you provide, your encryption keys, anonymized output, or mapping data, is ever sent to any external server, cloud storage, or API.

We do not:

• Collect or store any user data.
• Create or use cookies.
• Track users or record activity logs.
• Access your clipboard, local files, or device storage (unless you choose to upload or download explicitly).

All encryption and anonymization operations occur entirely in your browser’s memory (RAM). Once you close or refresh the page, all session data is permanently erased.

2. Security and Encryption

Document Anonymizer uses AES-256-GCM encryption with PBKDF2-SHA512 key derivation (200,000 iterations) and randomized salts and IVs for each session. Integrity is verified through SHA-256 checksums. Your encryption key is derived locally from your private passphrase and never transmitted or stored anywhere.

3. Anonymized and Mapping Data

The encrypted mapping data is either output as a downloadable file or embedded directly into the anonymized text.

• Only you possess the passphrase required to decrypt it.
• Losing the embedded data or passphrase means permanent loss of the ability to restore your data.
• The application does not have — and cannot regain — access to your original data.

4. Analytics, Third Parties, and Cookies

Document Anonymizer uses no analytics, no cookies, no fingerprinting, and no third-party code. All fonts, styles, and scripts are locally hosted and sandboxed.

5. Data Retention

None. No data is stored, collected, or transmitted. Once you leave or refresh the page, your content and mappings are gone from memory.

6. User Responsibility

You are responsible for managing your passphrase. Always handle anonymized text and embedded restoration data securely and in compliance with your applicable data protection obligations.

Terms of Use

Effective Date: January 1, 2025

1. Acceptance of Terms

By accessing or using Document Anonymizer, you agree to these Terms of Use. If you do not agree, please close the page immediately.

2. Permitted Use

You may use this service to:

• Anonymize, de-identify, or restore documents for lawful, ethical, and personal or professional use.
• Experiment, learn, or develop privacy-safe workflows.

3. Prohibited Use

You may not use Document Anonymizer to:

• Conceal, alter, or falsify data for illegal, fraudulent, or deceptive purposes.
• Obstruct lawful investigations, destroy evidence, or misrepresent facts.
• Develop or deploy any automated scraping, mining, or malicious tool against this service.
• Attempt to reverse-engineer, modify, or exploit the system’s cryptographic methods.

Any misuse of this application for unlawful or unethical activity is strictly prohibited and may violate local, national, or international laws.

4. No Warranty

Document Anonymizer is provided “as is” and “as available” without warranties of any kind, either express or implied.

We make no guarantees of suitability for a specific purpose, accuracy of anonymization, or recoverability of data in the event of user loss or error.

5. Limitation of Liability

Under no circumstances shall the developer, owner, or publisher of Document Anonymizer be liable for any damages, losses, or claims arising from use, misuse, or inability to use this application — including, but not limited to, data loss, business interruption, or unauthorized disclosure.

6. Intellectual Property

The interface design, algorithms, and documentation of Document Anonymizer are protected intellectual property. You may reproduce or host the tool under its license only if you maintain the same privacy and zero-knowledge guarantees.

Ethical Statement

Document Anonymizer was built to promote privacy, integrity, and responsible data handling in an era of widespread digital exposure and artificial intelligence.

We believe individuals and organizations must be empowered to use AI tools and share information without sacrificing confidentiality or risking misuse of personal data.

Our guiding ethics:

• Zero-knowledge by design: No user data ever leaves the device.
• Transparency: Every cryptographic operation and privacy limitation is explained openly.
• Neutrality: The system performs anonymization objectively, without bias or hidden behavior.
• Accountability: Users are fully in control of their data, encryption, and restoration.
• Beneficence: Created for education, research, and ethical data use — not for concealment of crimes or misinformation.
• Open inspection: The code is open for review and security testing to maintain public trust.

Document Anonymizer stands firmly for privacy as a human right, technological transparency, and ethical digital citizenship.

Disclaimer

Document Anonymizer is an independent, free-to-use privacy tool. It does not store, track, or share any user data, nor does it guarantee compliance with every regional data protection law or regulation.

By using this tool, you understand and agree that:

• You are solely responsible for the legality and ethical use of anonymized or restored content.
• The tool cannot be used to alter evidence, commit fraud, or conceal illegal information.
• The developers and maintainers assume no liability for damages or misuse of the application or its outputs.
• The anonymization process is pattern-based; while it significantly reduces risk, absolute anonymity cannot be guaranteed if users manually include identifiable content that bypasses detection.
• Users should always review anonymized documents before sharing or publishing.

Document Anonymizer is offered as-is, with no warranty, for legitimate and educational use only.