Free Online Excel Sheets Merger
Consolidate multiple Excel and CSV files into one clean master spreadsheet instantly. Our smart AI-powered column matching maps variables automatically, cleans data, removes duplicates, and filters files—all 100% inside your browser for maximum privacy.
How Excel Sheets Merger Works
Combine, clean, and export your master spreadsheet in 3 easy steps.
Upload Excel & CSV Files
Drag & drop multiple spreadsheet files (.xlsx, .xls, .csv). You can preview rows and select specific sheets per file to merge.
AI Column Alignment
Our engine uses Levenshtein fuzzy distance and synonyms to auto-match columns (e.g. "Customer" maps to "Client"). Adjust maps manually if needed.
Clean, Filter & Export
Apply data filters, strip duplicates, add calculated columns, and instantly download your master spreadsheet in Excel, CSV, or JSON.
Download Test Datasets
Download these sample spreadsheets to try out AI column mapping, deduplication, and custom formula calculations.
Branch A Sales Log
Standard transaction log. Clean structure with formal column names. Perfect base dataset.
Branch B Sales Log
Sales with column synonym headers (e.g. Invoice_ID, Client, Item, Qty, Price, Date) to test AI mappings.
Branch C Sales (Dirty)
Contains duplicate rows, leading/trailing whitespaces, and empty cells. Tests data cleaner and filter logic.
Marketing Mailing List
Customer mailing list. Ideal for testing custom calculated columns (e.g. Concatenation) and filter rules.
Why use our Excel Merger?
Manually copying monthly sheets can lead to errors and security issues.
100% Private, Zero Server Uploads
Your spreadsheets, sales lists, or employee records are parsed in browser memory. No data is sent to external servers. Ideal for sensitive business data.
Intelligent Column Recognition
No more uniform column name requirements. The AI engine recognizes synonyms, scores matches, and creates a consolidated master index schema.
Data Cleaning & Filters on the fly
Remove whitespace, exclude duplicate entries, discard empty headers, apply regex filter patterns, and insert calculated columns easily.
Frequently Asked Questions
Answers to popular questions about client-side Excel merging.
Q.How does AI-powered column matching work?
The engine compares column names using fuzzy matching (Levenshtein distance) and a semantic synonym database. If File A has "Client Name" and File B has "Customer", the tool maps them together automatically.
Q.Is my company data uploaded to any server?
Absolutely not. All parsing, data matching, duplicate cleaning, and Excel downloads happen entirely client-side using JavaScript inside your web browser. Your spreadsheets never leave your device.
Q.Can I merge Excel (.xlsx) and CSV files together?
Yes, you can upload a mix of .xlsx, .xls, and .csv files simultaneously. The merger reads each data format and allows you to align their columns into a single unified Excel or CSV file.
Q.Are there any row or file size limits?
Since files are processed on your local device, there are no software limits. The tool is constrained only by your computer memory, comfortably handling files with hundreds of thousands of rows.
How Excel Merger Works
Our high-performance online utility runs entirely client-side, processing your files securely and instantly inside your web browser. For related functions, you can also use our Excel Splitter and Excel Cleaner utilities.
Upload Files
Step-by-step interactive processing designed for simple, fast, and high-fidelity execution.
Match Columns
Step-by-step interactive processing designed for simple, fast, and high-fidelity execution.
Merge Data
Step-by-step interactive processing designed for simple, fast, and high-fidelity execution.
Merge Features
Designed for professional results, privacy, and maximum compatibility across all modern desktop and mobile browsers:
Smart AI Matching
Full digital precision and optimized performance with zero server-side latency or external data transfers.
Duplicate Detection
Full digital precision and optimized performance with zero server-side latency or external data transfers.
Data Cleaning
Full digital precision and optimized performance with zero server-side latency or external data transfers.
Export Master File
Full digital precision and optimized performance with zero server-side latency or external data transfers.
Frequently Asked Questions About Excel Merging
Is this Excel merger free?
Yes. Merge unlimited Excel files with no registration.
How does AI column matching work?
Smart AI automatically detects and matches columns with similar names across files.
Does it detect duplicates?
Yes. Built-in duplicate detection removes or flags repeated rows automatically.
Do you store Excel files here?
No. All merging happens locally with complete privacy.