What Merge Excel Files helps you do

Monthly workbooks, regional exports, and per-team reports often need to become one file. This tool reads each workbook in the browser, lets you pick a worksheet, and either appends rows into one sheet or preserves each selected sheet. It is the difference between one tidy import file and a folder of versions nobody wants to reconcile by hand.

Every workbook is read and merged in your browser. Files are not uploaded to Haivix, and macros are never executed.

How it works

Each workbook is parsed and the selected worksheet is converted into a table. Append mode unions the columns or aligns them by position and writes the combined rows as values. Worksheet mode copies each selected sheet into a new workbook, preserving its cells and formulas where the browser library supports them. Charts and cell styles are not carried over.

How to use Merge Excel Files

Drop two or more Excel workbooks and choose a worksheet for each file.
Select append mode or keep one worksheet per file, then set the header and matching options.
Merge the workbooks, review the preview, and download the XLSX or CSV.
Open the result and check the row count and the joins between sources.

When to use it

Combine monthly workbooks that share columns but not column order.
Package several departmental worksheets into one workbook without uploading them.
Create a single import sheet from several regional exports.
Collect per-team tabs into one review workbook.
Join historical exports into an archive file.
Prepare one workbook for a reviewer who should not open five files.
Merge exports from two systems after aligning their headers.

When not to use it

Do not append sheets with different meanings for the same column name.
Do not expect charts or detailed cell styling to survive.
Do not use worksheet mode when you need one flat table for an import.

Example

Three regional workbooks each have a sales sheet with the same columns in a different order. Append mode aligns the headers, produces one table with a source column, and the preview shows no blank columns. The combined XLSX is sent to finance instead of the three originals.

What you can do with Merge Excel Files

Merge two or more Excel workbooks.
Choose a worksheet from each file.
Append rows into one worksheet or keep one sheet per file.
Match columns by header name or position in append mode.
Export the result as XLSX or CSV.
Keep the source files on your device.

Example: combine monthly workbooks

Drop the monthly files and pick the data worksheet in each. A workbook with a cover sheet will otherwise contribute the cover to the merge.

Choose append mode when the sheets share columns and should become one table. Choose worksheet mode when each file should stay a separate sheet.

Review the preview for column drift, then download the workbook and check the first and last rows of each source.

What to know before you start

Append mode writes values, not formulas.
Worksheet mode keeps the original worksheet cells, including formulas; charts and cell styles are not supported by the browser Excel library.
Each workbook is capped at 50 MB and limited by available browser memory.
Merging does not deduplicate rows or reconcile conflicting values.
Only one worksheet per source file is used.

Common mistakes

Merging the cover sheet instead of the data sheet.
Appending files whose columns mean different things.
Expecting formulas to be recalculated in append mode.
Assuming charts and colors will be preserved.
Skipping the preview and discovering a column mismatch after the merge.

Troubleshooting

If columns are misaligned, switch between header and position matching and compare the first rows of each file.

If a formula is missing in append mode, that mode writes values. Use worksheet mode if the formula must remain.

If the merge fails, one workbook may be encrypted, damaged or beyond the 50 MB cap.

If the output looks empty, the selected worksheet may contain only formulas without cached values.

If the file is hard to open, reduce the number of source workbooks per merge.

If a worksheet is missing in worksheet mode, it may have been hidden in the source. Unhide it in Excel and merge again; hidden sheets are not part of the visible workbook list in every parser.

If an appended column is blank for an entire source, that file's header likely has a different spelling. Fix the header and merge again rather than filling the blanks by hand.

Merge Excel Files