Browser-based · Files stay on your device · No signup
Merge Excel Files Online
Merge Excel files online free — combine multiple Excel and spreadsheet files into a single workbook directly in your browser. Supports XLSX, XLS, XLSM, XLSB, CSV, TSV and ODS with Append Rows, Preserve Sheets or Side-by-Side Columns. No upload, no signup, completely free.
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XLSX · XLS · XLSM · XLSB · CSV · TSV · ODS
How To Merge
How to Merge Multiple Excel Files Into One Workbook
Add your files, pick a merge mode, and download one combined spreadsheet in XLSX or CSV.
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Upload Spreadsheet Files
Drag and drop or browse to add multiple spreadsheets. Supported formats: XLSX, XLS, XLSM, XLSB, CSV, TSV, and ODS.
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Choose Merge Mode
Select Append Rows, Preserve Sheets, or Side-by-Side Columns depending on how you want the final workbook organized.
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Merge and Download
Click Merge & Download. Processing happens in your browser, and the merged file downloads directly to your device.
Why teams use this merger
- Save time when merging recurring reports and exports.
- Reduce manual copy-paste mistakes between files.
- Keep merged data organized in one clean output file.
Merge Modes
Choose the Right Merge Mode for Your Files
Pick the mode that matches your spreadsheet structure, then export as XLSX or CSV.
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Append Rows
Best when all files represent the same dataset. Rows from each file are stacked into one sheet, and columns are aligned by header name.
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Preserve Sheets
Best when you need each workbook and sheet to stay separate. Every sheet from every file is kept as its own tab in one output workbook.
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Side-by-Side Columns
Best for side-by-side comparison. Data from the first sheet of each file is placed in parallel column blocks in one sheet.
Quick mode comparison
| Mode | Best for | Input sheets used | Formulas/formatting |
|---|---|---|---|
| Append Rows | Stacking similar tables | First sheet from each file | Not preserved in the same way |
| Preserve Sheets | Keeping workbook tabs separate | All sheets from every file | Sheets are carried over |
| Side-by-Side Columns | Comparing files next to each other | First sheet from each file | Not preserved in the same way |
Different Columns
Merge Excel Files With Different Columns and Headers
Use Append Rows mode when your files share some fields but not the exact same layout.
- Columns are aligned by header name, so column order can differ between files.
- If a file is missing a header that appears in other files, those cells remain blank.
- This mode is useful for combining exports from different teams, systems, or reporting periods.
- Use optional duplicate row removal after merging when files may contain overlapping records.
Supported Formats
Supported Spreadsheet Formats
Merge Excel and spreadsheet files in one run without converting them first.
- Supported input formats: XLSX, XLS, XLSM, XLSB, CSV, TSV, and ODS.
- You can combine mixed file types together, such as Excel workbooks and CSV exports.
- Download the merged output as XLSX for workbook use or CSV for flat-file workflows.
Private Processing
Merge Excel Files Without Uploading Them
This is a browser-based Excel merger designed for private local processing.
- Spreadsheet files are processed on your device in your browser session.
- Spreadsheet contents are not uploaded to our servers by the merge tool.
- No signup or account is required to merge and download files.
Common merge use cases
- Combine monthly reports from each branch into one workbook.
- Merge sales exports from different tools before analysis.
- Unify supplier lists from multiple teams into one dataset.
- Collect team spreadsheets while keeping each sheet separate.
Before You Merge
Important Notes and Limitations
A few quick checks can help you choose the right mode and avoid surprises.
- Password-protected or encrypted files are not supported.
- Preserve Sheets keeps all sheets from each input file.
- Append Rows and Side-by-Side Columns use the first sheet from each file.
- In Append Rows and Side-by-Side Columns, formulas and formatting are not preserved in the same way as source sheets.
- Output order follows the order in which files are added.
- Very large files depend on available browser and device memory.
FAQ
Frequently Asked Questions
Is this tool free to use?
Yes. MergeExcelFilesOnline.com is free to use and does not require signup. Add your files, choose a merge mode, and download the result.
What file types are supported?
You can merge XLSX, XLS, XLSM, XLSB, CSV, TSV, and ODS files. Mixed file types are supported in the same merge.
What is the difference between Append Rows, Preserve Sheets, and Side-by-Side Columns?
Append Rows stacks rows from the first sheet of each file into one table and aligns by header. Preserve Sheets keeps all sheets from all files as separate tabs in one workbook. Side-by-Side Columns places data from the first sheet of each file next to each other in parallel columns.
What happens if my files have different columns?
In Append Rows mode, columns are matched by header name. Column order can differ, and missing values are left blank where a file does not contain a header.
Can I merge workbooks with multiple sheets?
Yes. Preserve Sheets mode keeps all sheets from every input file. Append Rows and Side-by-Side Columns use the first sheet from each file.
Will formulas and formatting be preserved?
In Preserve Sheets mode, original sheets are carried into the output workbook. In Append Rows and Side-by-Side Columns, data is converted into merged row-and-column tables, so source formulas and cell formatting are not preserved in the same way.
Are password-protected files supported?
Password-protected or encrypted spreadsheet files are not supported for merging. Remove file protection first, then merge the files.
Is it safe to merge sensitive spreadsheet files?
Files are processed in your browser on your device, and spreadsheet data is not uploaded to our servers. For sensitive files, still use a trusted device and browser environment.
Can I merge Excel files without uploading them?
Yes. The merge process runs in your browser, so spreadsheet contents are not uploaded to our servers by the tool.
Can I combine CSV and Excel files?
Yes. You can merge CSV and Excel formats together, including XLSX, XLS, XLSM, and XLSB, then export the result as XLSX or CSV.
Which merge mode should I choose?
Choose Append Rows for one combined table, Preserve Sheets to keep each sheet as separate tabs, and Side-by-Side Columns when you need file data aligned next to each other for comparison.