Data Anonymizer
Protect sensitive information by anonymizing emails, phone numbers, credit cards, SSNs, IP addresses, and other personal data for GDPR and privacy compliance
Anonymization Options
Recommended Settings
Pro Tips
- •All processing happens in your browser - data never leaves your device
- •Preserve formatting to maintain readability while hiding sensitive information
- •Use brackets [Name] to manually mark names for masking
- •Use braces {secret} to hash sensitive data with SHA-256 cryptographic hashing
- •Masking shows last 4 digits for verification while hiding the rest
Most Popular
Most users enable all automatic detection options for comprehensive privacy protection
When to Use This Tool
Anonymize personal data in logs, databases, and documents to comply with GDPR, CCPA, and other data protection regulations. Remove personally identifiable information (PII) before sharing datasets or creating public documentation.
Create realistic test data from production databases by anonymizing customer information. Share safe datasets with developers, QA teams, and third-party contractors without exposing real user data or violating privacy policies.
Sanitize logs, error reports, and support tickets before sharing with external teams or posting to public forums. Remove sensitive customer information while preserving the structure and context needed for troubleshooting.
Prepare datasets for research, analytics, or business intelligence by removing sensitive fields. Share anonymized data with partners, researchers, or across departments while maintaining data utility and protecting individual privacy.
How It Works
Detect sensitive data patterns using regular expressions (emails, phones, cards, SSNs, IPs)
Apply masking to identified patterns, preserving last 4 characters for verification
Process manually marked data (names in [brackets], secrets in {braces})
Hash sensitive data using SHA-256 cryptographic algorithm for irreversible anonymization
Preserve original formatting (dashes, spaces, parentheses) if option is enabled
Replace sensitive characters with masking character (default: asterisk)
Output anonymized data ready for safe sharing and compliance
100% Private
Files never leave your device. All processing happens locally in your browser.
Lightning Fast
Powered by Pure JavaScript for optimal performance on modern browsers.
Secure
No data collection, no tracking, no sign-up required.
Frequently Asked Questions
Is my data safe? Does it leave my browser?
Absolutely safe! All anonymization happens entirely in your browser using JavaScript. Your data never leaves your device, is never uploaded to any server, and is never stored anywhere. This is pure client-side processing for maximum privacy and security.
What's the difference between masking and hashing?
Masking replaces characters with asterisks (***) while keeping the data format readable - you can still see it's a phone or email. Hashing uses SHA-256 to convert data into a unique fingerprint that's completely irreversible - the original value cannot be recovered, making it ideal for secrets and passwords.
Can I customize which digits are shown for verification?
Currently, the tool shows the last 4 digits/characters for all masked data (phones, cards, SSNs). This is the industry standard for verification while maintaining privacy - enough to confirm identity without exposing the full sensitive value.
How do I mark names or custom sensitive data?
Use square brackets [like this] around names you want to mask. Use curly braces {like this} around data you want to hash with SHA-256. The tool will automatically detect and anonymize anything within these markers based on your selected options.
Will this work for database dumps or CSV files?
Yes! Upload any text file including database dumps, CSV exports, log files, or plain text documents. The tool will scan the entire content and anonymize all detected sensitive patterns while preserving the file structure and formatting.
Is the anonymization reversible?
No, and that's by design for security. Masking is one-way (*** cannot be converted back), and SHA-256 hashing is cryptographically irreversible. This ensures anonymized data truly protects privacy and meets compliance requirements. Always keep original data in a separate secure location if you need it.