Univik vCard Duplicate Remover

Four-Strategy Detection Engine

The scan engine runs four independent matching strategies simultaneously using a Union-Find algorithm. UID exact match catches synced contacts. Last-10-digit phone matching catches duplicates despite formatting differences. Case-insensitive email matching catches capitalisation variants. Normalised name matching catches minor spelling differences. An entry only needs to match on one strategy to be grouped.

Intelligent Deduplication — No Data Lost

When duplicates are grouped, the richest contact (most complete data) is elected as the reference contact. Scalar fields like organisation, title and birthday are filled from duplicates only if blank on the base. List fields, phones, emails, addresses, websites, IM handles and social profiles, are fully unioned across all group members. Notes are concatenated without repeating exact duplicates. Photos: the largest binary across the group wins.

Colour-Coded Review Before Export

After scanning, duplicate groups are colour-coded directly in the contact list, each group in a distinct pastel colour. The contact elected as the reference contact is labelled ✓ KEEP; others are labelled × DUPLICATE. The full detail panel lets you inspect every field on any contact before committing to export. You always see exactly what the combined output will contain.

Manual Override, Mark as Not a Duplicate

Any entry flagged as DUPLICATE can be right-clicked and set to Not a Duplicate at any time before export. It is removed from its group and saved as a fully independent contact. If this reduces a group to one remaining member, that member is also de-grouped automatically. Any manually excluded contact can be restored to its duplicate status via right-click → Restore as Duplicate.

Automatic Backup & Audit Log

Every export automatically creates two sidecar files. discarded_duplicate_contacts.vcf saves the original pre-combine versions of every discarded contact so nothing is permanently lost. duplicate_processed_log.txt provides a full audit trail listing every contact as KEPT or DISCARDED with the matching reason for each duplicate pair, for example "Same phone: +44 7911 123456". Both files are written alongside your output automatically.

Batch Processing, Folders & Multiple Files

Load a single VCF file, multiple files selected with Ctrl/Shift-click, or an entire folder of VCF files in one operation. Files are combined transparently into a single indexed dataset for processing. The window title shows the source name and file count throughout. Recent Files and Recent Folders menus provide quick access to the last 10 opened sources.

Non-Destructive, Original Never Modified

The original source VCF file is never modified under any circumstances. All processing takes place in memory and the clean output is always written to a separate file or folder you specify. Open a file, scan, review and export, your source stays exactly as it was when you opened it, regardless of what you choose to export.

Real-Time Search & Sort

The built-in search filters across name, email and company simultaneously as you type, with matching text highlighted in results. Six sort options cover name, email, company, photo presence and email presence. After a scan, sort order is overridden by duplicate grouping, duplicate groups appear first in group-number order with the KEEP contact at the top of each group, followed by all unique contacts.

High-Performance Engine

Memory-mapped file indexing loads large VCF files without loading the entire file into RAM. Index data is cached alongside the source file, reopening the same file skips re-indexing entirely. The virtualised contact list renders only visible rows regardless of file size, so files with 100,000+ contacts remain fully responsive. Scanning, indexing and exporting all run on background threads with live progress and a cancel button.

Full vCard Standards Compliance

The export engine is fully RFC-compliant across all three vCard versions. vCard 4.0 output follows RFC 6350 including GENDER, ANNIVERSARY and IMPP. vCard 3.0 follows RFC 2426. vCard 2.1 follows the original specification with ENCODING=BASE64 for binary data. All output is UTF-8 without BOM with RFC line folding at 75 octets. PRODID and REV fields are written on vCard 3.0 and 4.0 output.

20-Language Interface

The full application interface is available in 20 languages: English, Spanish, French, German, Italian, Portuguese, Russian, Chinese, Japanese, Korean, Arabic, Hebrew, Hindi, Turkish, Dutch, Polish, Swedish, Thai, Vietnamese and Indonesian. Language can be switched at any time from the toolbar dropdown without restarting the application.

Flexible Export Options

Four export modes cover every workflow. Individual VCF files writes one .vcf per unique contact to a folder you choose, ideal for importing into phones or address books that accept per-contact files. Combined exports write all contacts to a single .vcf in your chosen version (4.0, 3.0 or 2.1). All export modes run the full deduplication pipeline and write the discarded contacts backup and audit log automatically.