CSV to Excel
Convert a CSV file to Excel (.xlsx) in your browser. Download a real spreadsheet — nothing is uploaded.
Merge Excel files
Combine multiple Excel files into one .xlsx in your browser. Stacks rows from each workbook’s first sheet.
Drop Excel files here or click to choose
Combine locally — nothing is uploaded
How to use Merge Excel files
Merge multiple Excel files by stacking rows from each workbook’s first sheet. Headers are aligned by name when possible.
Everything runs locally in your browser — your files are never uploaded to a server.
Merge Excel files FAQs
How do I merge Excel files online?
Add two or more Excel workbooks, then download one combined .xlsx. Rows are stacked from each file’s first sheet, with headers aligned by name.
Is merging Excel files free?
Yes. Every Excel and CSV tool on ReallyUseful.Tools is free to use, with no account or subscription required.
Are my files uploaded?
No. Files are processed in your browser on this device. Nothing is uploaded to our servers.
Which sheet is used from each workbook?
Each workbook’s first sheet is merged. Put the data you want on the first sheet, or export that sheet to CSV first.
More Excel/CSV
Excel to CSV
Convert Excel .xlsx or .xls to CSV in your browser. Choose a sheet and delimiter, then download.
CSV viewer
Open and browse a CSV in a paginated table in your browser. No upload — view large files locally.
Merge CSV files
Combine multiple CSV files into one in your browser. Rows are stacked and headers aligned by name.
CSV to XML
Convert CSV rows into structured XML in your browser. Each row becomes an element — nothing is uploaded.