VCF Duplicate Detector & Remover

Automatically detect and remove duplicate contacts from your VCF files. Advanced algorithms find duplicates by matching names, email addresses, and phone numbers with customizable sensitivity.

Smart DetectionMultiple Match TypesManual Review
Step 1: Upload VCF File
Upload your VCF file to detect and remove duplicate contacts
🔍

Smart Detection

Advanced algorithms detect duplicates by matching names, emails, phone numbers, and organizations

⚖️

Adjustable Sensitivity

Choose between strict, normal, and loose detection modes to find the right balance for your data

👀

Manual Review

Review each duplicate group and manually decide which contacts to keep or remove

📊

Similarity Scoring

Each duplicate match includes a similarity score and explanation of why contacts were matched

🔒

Privacy Protected

All processing happens locally in your browser - your contacts never leave your device

Bulk Actions

Quick actions to keep the first contact in each group or remove entire duplicate groups

How Duplicates Are Detected

📝 Name Matching

  • • Identical full names (case-insensitive)
  • • Same first and last name combinations
  • • Handles special characters and spacing variations
  • • Matches formal names with nicknames where possible

📧 Email Matching

  • • Exact email address matches (case-insensitive)
  • • Handles multiple email addresses per contact
  • • Ignores email formatting differences
  • • Detects shared email addresses across contacts

📱 Phone Matching

  • • Normalizes phone numbers (removes formatting)
  • • Matches based on last 10 digits for international numbers
  • • Handles various phone number formats
  • • Considers multiple phone numbers per contact

🏢 Contextual Matching

  • • Same organization with similar names
  • • Considers job titles and company information
  • • Weights matches based on multiple factors
  • • Provides similarity scores and explanations

Detection Sensitivity Levels

🎯
Strict Mode

Only contacts with very high similarity (80%+) are considered duplicates.

  • • Identical names OR emails OR phones
  • • Minimizes false positives
  • • Best for already clean lists
  • • Conservative approach
⚖️
Normal Mode
Recommended

Balanced approach detecting medium similarity (60%+) duplicates.

  • • Combines multiple matching factors
  • • Good balance of accuracy vs coverage
  • • Suitable for most contact lists
  • • Default recommended setting
🌐
Loose Mode

Finds more potential duplicates (40%+) but may include false positives.

  • • Lower similarity threshold
  • • Catches more subtle duplicates
  • • May require more manual review
  • • Best for heavily duplicated lists

Perfect For

📱 Post-Migration Cleanup

Clean up contact lists after migrating between devices, platforms, or merging multiple accounts that may have created duplicate entries.

🔄 Regular Maintenance

Periodic cleanup of contact databases that accumulate duplicates over time from various sources and sync conflicts.

🏢 Business Contact Management

Maintain clean customer and client databases by removing duplicates that can cause confusion and inefficiencies in business operations.

📧 Email Marketing Lists

Ensure email marketing campaigns are efficient and compliant by removing duplicate contacts before importing to marketing platforms.

🔗 System Integration

Prepare contact lists for CRM systems, help desk software, or other business tools that work best with clean, deduplicated data.

📊 Data Analysis

Clean contact data for accurate analytics, reporting, and insights where duplicate entries would skew results and metrics.

Frequently Asked Questions

How accurate is the duplicate detection?

The tool uses multiple matching algorithms and provides similarity scores with explanations. Normal mode achieves high accuracy for most contact lists, while manual review ensures precision.

Can I review duplicates before removing them?

Yes! The tool shows all potential duplicates grouped together with similarity explanations. You can manually select which contacts to keep or remove before downloading the cleaned file.

What if the tool misses some duplicates?

Try adjusting the sensitivity to "loose" mode to catch more potential duplicates, or run the detection multiple times with different settings.

Will contact information be preserved?

Yes, the original vCard format and all contact information for kept contacts is perfectly preserved. Only the contacts you choose to remove are excluded.

Can I handle large contact files?

Yes, the tool can process files with thousands of contacts efficiently. Processing happens in your browser, so very large files may take a moment to analyze.

Technical Information

Detection Algorithms

  • • Multi-factor similarity scoring
  • • Normalized text comparison
  • • Phone number normalization
  • • Case-insensitive matching

Supported Formats

  • • VCF (vCard) files (.vcf, .vcard)
  • • All vCard versions (2.1, 3.0, 4.0)
  • • UTF-8 and ASCII encoding
  • • Files from all platforms

Performance

  • • Client-side processing
  • • No file upload to servers
  • • Real-time duplicate analysis
  • • Handles thousands of contacts

Privacy & Security

  • • No data sent to servers
  • • Processing in browser only
  • • No registration required
  • • Complete privacy protection