Data Deduplicator
Scan, identify, and purge duplicate records from your tables and spreadsheets locally. Build granular unique key combinations to isolate exact dataset items.
Selecting a file allows the browser to read it locally. Files are processed locally in your browser when using supported tools. No upload required for supported workflows.
Drag & drop files to begin
Select or drag multiple files from your device. Entirely processed locally in your browser memory.
Local-First Data Deduplication
Secure, browser-native deduplication without server dependencies.
SHRTX removes duplicate records from your tabular datasets using a high-performance, client-side deduplication engine. By executing the hashing and matching operations locally within your browser memory, your data remains secure, confidential, and under your control. This browser-based architecture ensures that sensitive records, customer listings, or transaction logs are never sent over the network. Deduplicate rows, configure custom column-level uniqueness rules, and export normalized files instantly.
Deduplication Pipeline
Trace how duplicate records are identified and purged step-by-step.
Load File
Load your CSV or text dataset into the secure explorer.
Map Columns
Identify individual columns to inspect for duplicate values.
Apply Trimming
Clean trailing and leading spaces from cells before comparison.
Toggle Casing
Choose whether to treat differently capitalized strings as duplicates.
Choose Occurrence
Keep the first or last instance of a duplicated record.
Filter Rows
Isolate duplicate lines into a separate, downloadable dataset.
Instant Download
Download the unique dataset instantly to your local machine.
Core Deduplication Features
Precision tools designed for browser-native data cleaning.
Column-Level Selectivity
Look for duplicates globally across all columns or target specific keys like Email or ID.
Case-Insensitivity Check
Standardize and compare records regardless of casing variations (e.g. [email protected] vs [email protected]).
Whitespace Isolation
Ignore leading and trailing spaces that create artificial uniqueness during string comparison.
Duplicate Isolation
Track and extract all removed duplicate rows so you can review them in a separate table.
Supported Formats
Comma-Separated Values (CSV)
Full support for standard delimited values. Ideal for email lists and database sheets.
Text Datasets
Deduplicate plain text strings, raw logs, or comma-delimited columns.
JSON Records Array
Import tabular records and clean them, preparing clean structured outputs.
Basic Sorting vs Hashed Deduplication
Why targeted hashing provides reliable deduplication results.
Practical Applications
Ensure high-fidelity data before importing to production platforms.
Marketing List Cleaning
Filter email newsletters to remove duplicate subscriber addresses before running campaigns.
Database Unique Index Preflight
Resolve duplicate key constraints before executing SQL table imports or syncing databases.
Log Stream Auditing
Consolidate repeating log entries to review unique warning states or system events.
Contact Management
Clean up duplicate phone numbers or physical addresses across CRM exports.
Local Processing by Design
This tool operates directly inside your web browser using HTML5 File APIs. No spreadsheets or records are transmitted over the network or stored on our servers. Files stay on your device, assuring confidentiality and offline support.
Frequently Asked Questions
Q:How does the Deduplicator protect my privacy?
Q:What is the difference between keeping the "First" vs "Last" occurrence?
Q:Can I deduplicate based on multiple columns?
Q:Does case-insensitivity affect numerical data?
Q:Is there a maximum file size for deduplication?
Q:Can I run this tool offline?
Learning Resources
Master this tool with Product Guides
Learn the workflows, common mistakes, and advanced techniques behind Data Deduplicator with our deep-dive educational content.