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 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
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
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
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