Data Merger
Amalgamate, stack, and align multiple spreadsheet datasets locally. Choose between vertical union stacking or horizontal primary-key joins.
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 Merger
Join multiple tabular datasets securely inside your web browser.
SHRTX enables you to join or append separate tabular datasets together using professional relational merging strategies. By processing all operations entirely inside your web browser's memory, you avoid uploading sensitive tables, contact spreadsheets, or metrics logs to any external servers. The merger supports both horizontal joins (aligning matching rows by common ID or Key columns) and vertical unions (stacking files with automatic header alignment). Merge your tables cleanly and export the unified results immediately.
Tabular Joining Workflows
Understand how tables are aligned and consolidated during execution.
Load Tables
Load primary and secondary CSV sheets into the applet interface.
Choose Strategy
Select vertical append or relational horizontal alignment.
Set Join Key
Choose the relational column to match across all documents.
Align Columns
Match matching columns or rename duplicate names automatically.
Resolve Matches
Process rows to filter matches or keep unmatched values.
Verify Results
Audit headers and unified rows in the live browser preview.
Secure Export
Download the newly joined, clean dataset locally.
Core Data Merging Features
Professional merging paradigms accessible completely offline.
Left Join Alignment
Keeps all rows from your primary table and appends matching values from secondary tables.
Inner Join Matching
Filter your dataset to only show rows where joining keys exist in both spreadsheets.
Vertical Union Stacking
Append rows vertically, automatically placing values in corresponding columns even if the headers are out of order.
Conflict Prefixing
Automatically detects non-key duplicate headers across files and prefixes them with source names.
Supported Dialects
Comma-Separated Values (CSV)
Full support for standard tables. Perfect for database joins and mailing spreadsheet alignments.
Tab-Separated Values (TSV)
Easily handle tab-delimited files, ideal for quick spreadsheet clipboard copies.
Custom Separators
Work with alternative separators, standardizing them into an exportable, unified format.
Manual Spreadsheet lookups vs Relational Merger
How local machine-based automation outperforms manual sorting.
Practical Applications
Combine independent data feeds cleanly inside your web browser.
Consolidating Marketing Leads
Merge subscriber list details with customer transaction files using email as a matching key.
Monthly Sales Aggregation
Stack multiple monthly regional CSV reports together with perfect header alignment.
System Metric Correlation
Align system performance logs with error databases based on timestamp keys.
CRM Data Merges
Match legacy client ID files with updated address spreadsheet records.
Local Execution 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 secure is my data in the Data Merger?
Q:What is the difference between Left Join and Inner Join?
Q:What is a Vertical Union?
Q:What happens if files have different column names that mean the same thing?
Q:Is there a maximum limit on the number of rows?
Q:Can I merge files offline?
Learning Resources
Master this tool with Product Guides
Learn the workflows, common mistakes, and advanced techniques behind Data Merger with our deep-dive educational content.