Merge Excel Files Online Free - Combine Sheets & CSV [2026]

Combine multiple Microsoft Excel spreadsheets (.xlsx, .xls) and CSV files into one master workbook. Append data rows with smart column alignment, or merge multiple files into separate tabs. 100% private in-browser spreadsheet merger.

To merge multiple Excel or CSV files: Drag and drop your .xlsx, .xls, or .csv files into LabelCropper, choose 'Combine Rows' to stack data with smart column header alignment or 'Separate Sheets' to keep each file in its own tab, and click Merge & Download to get your clean merged workbook instantly.

How to merge multiple Excel and CSV files online for free

  1. Upload Excel or CSV Files — Select two or more .xlsx, .xls, or .csv files from your computer or phone. Batch upload multiple files at once.
  2. Choose Your Merge Mode — Choose Combine Rows to append all records into one master sheet, or Multi-Sheet Workbook to keep files as separate tabs.
  3. Customize Options & Ordering — Reorder files with up/down arrows, enable smart header matching, add a source file tracking column, or filter duplicate rows.
  4. Download Merged Spreadsheet — Click Merge & Download Excel to instantly generate and download your clean, combined .xlsx or .csv workbook.

Key Capabilities & Features

  • Smart Column Alignment: Automatically matches column header names across different files, even if columns appear in different orders.
  • Append Rows or Multi-Tab: Easily switch between stacking all rows into a single master sheet or keeping each file as a separate tab.
  • Source File Tracking Column: Optionally inserts a Source_File column to easily audit which batch or date each data row originated from.
  • 100% Client-Side Privacy: Your private financial spreadsheets, sales records, customer data, and accounting ledgers never leave your device.

Why Choose LabelCropper vs Other Tools

LabelCropper gives you bank-grade security: files are processed locally in your browser with WebAssembly and are never uploaded to a cloud server (GDPR & HIPAA compliant). No subscriptions, no registration, no daily limits, and no watermarks on your PDFs. Works seamlessly on Windows, Mac, Linux, iPhone, and Android devices worldwide.

Merge Excel FAQ

How do I merge multiple Excel files into one sheet?

Upload your Excel (.xlsx, .xls) or CSV files, select "Combine Rows (Single Master Sheet)", enable "Smart Column Alignment", and click Merge. All data rows are neatly stacked under matching headers.

Can I merge CSV files with XLSX Excel files?

Yes! You can mix and match CSV and Excel spreadsheets in the same merge queue. The tool unifies them into a single .xlsx workbook or .csv file.

Will columns align properly if their order is different in each file?

Yes. Our smart header alignment engine maps each cell to its corresponding column name rather than raw column index, ensuring perfect alignment.

Multiple Excel files ko ek sheet me kaise merge kare (Hindi)?

LabelCropper ke Merge Excel tool me apni sabhi Excel ya CSV files upload karein, "Combine Rows" option select karein, aur Merge button dabayein. Sabhi files ka data ek hi master sheet me jud jayega.

¿Cómo unir varios archivos de Excel en uno solo (Spanish)?

Sube tus hojas de cálculo a la herramienta Merge Excel de LabelCropper, selecciona combinar filas o mantener pestañas separadas y descarga tu archivo combinado al instante.