Can I merge Excel files with different columns?

Yes. Append Rows creates separate output columns for different header names. Standardize equivalent headers first for the cleanest result.

Does the tool preserve formulas and formatting?

Append Rows focuses on readable table data. Keep Sheets may retain some worksheet features, but formulas, charts, macros, styling, and external links must be verified.

Are spreadsheet files uploaded to a server?

Spreadsheet contents are read and processed in the current browser tab and are not sent to an application processing server.

How many Excel files can I merge?

There is no fixed application count, but browser memory, device capacity, and workbook complexity create practical limits.

Should I keep the original workbooks?

Yes. Keep backups and verify generated output before important use.

Merge Excel Files Online

Combine multiple XLSX, XLS, or CSV files without sending spreadsheet contents to an application processing server. Choose Append Rows to combine similar tables into one worksheet, or Keep Sheets to place source worksheets in one output workbook.

How to merge Excel files online

Select two or more supported files.
Choose Append Rows or Keep Sheets.
Arrange files in the required processing order.
Configure source columns and identical-row removal.
Merge, download, and verify the output in Excel.

Merge Excel files into one sheet or keep separate worksheets

Append Rows aligns values by header name and is best for similar monthly reports, transaction exports, inventory files, survey responses, and CRM downloads. Keep Sheets is better when source worksheets have different layouts or must remain separate.

Merge files with different columns

Different header names create separate output columns. Standardize equivalent names such as Customer ID and CustomerID before merging.

Track the source of every row

Optional source columns can identify the original file and worksheet for each appended record.

Before and after example

Before

January.xlsx and February.xlsx each contain Date, Order ID, and Revenue columns.

After

Append Rows creates one table containing both months and optional source columns. Keep Sheets creates separate January and February tabs.

Data and output behavior

Headers are aligned by exact text.
Append Rows focuses on readable values rather than workbook presentation.
Charts, macros, external links, and advanced styling must be verified.
Duplicate removal applies only to completely identical rows.

Common use cases

Typical uses include monthly sales reports, expense exports, inventory lists, survey responses, CRM exports, and recurring CSV downloads.

Troubleshooting

Columns do not line up

Make header names consistent before merging. Spaces, punctuation, and spelling differences create separate columns.

Dates look different

Excel serial dates, text dates, and regional formats may be interpreted differently. Review all date columns after download.

The output is blank

Protected, encrypted, damaged, or connection-based workbooks may not expose readable table data.

The browser becomes slow

Large workbooks consume browser memory. Process fewer or smaller files at a time.

Frequently asked questions

Can I combine XLS and XLSX files?

Yes, within the features supported by the browser spreadsheet library.

Can duplicate rows be removed?

The tool removes only rows that are completely identical across all output columns.

Are files uploaded?

Spreadsheet contents are processed in the browser tab. Hosting and static asset providers may receive ordinary web request data, but selected file contents are not sent to an application processing server.