Merge Multiple Excel Files Online: Combine All Sheets into One Workbook

2026-07-04

When to merge Excel files

Typical cases:

  • Monthly reports from each team combined for management
  • Exports from several systems in one workbook for side-by-side review
  • Merge first, then dedup, SQL export, or format

ComTools Excel Merge (Tools/Excel/Merge) combines multiple .xlsx files in selection order: every worksheet from every file is kept in a single downloadable .xlsx.

How merge works

Item Details
Formats .xlsx, .xlsm, .xltx, .xltm
Not supported .csv, legacy .xls (save as xlsx first)
Mode Merge by sheet—not stacking rows into one sheet
File order First selected file first; reorder with ↑↓ in the list
Sheet names Duplicates get (2) suffix; default Sheet1 names are renumbered

Example: file A has Sales and Stock, file B has Summary → one workbook with three sheets (order follows A then B).

Steps

  1. Open Excel Merge.
  2. Select files (multiple at once, or add more later).
  3. Confirm order; use ↑↓ to reorder.
  4. Remove unwanted files with ×.
  5. Click Start merge and wait for completion.
  6. Download the merged .xlsx.

Common scenarios

Scenario Tip
Department rollups Order files by dept; use meaningful sheet names
Row-level union on one sheet This tool keeps separate sheets—align headers and paste, or use per-file INSERT SQL
Merge → dedup → database Dedup per sheet or main sheet only
Data from web tables HTML to Excel first, then merge

Not the same as “append rows”

Worksheets are not stacked into a single sheet. To combine rows with the same schema:

  1. Merge for one workbook to manage, or
  2. Copy rows in Excel, or
  3. INSERT SQL per file and union in the database

To split sheets out of one file, use Excel Split.

Notes

  • Use clear sheet names before merge—many Sheet1 tabs are hard to read even after auto-rename.
  • .xlsm uploads work; macros are not guaranteed in the output.
  • Processing is server-side; mind data sensitivity.
  • Large files take longer—wait for the status message.

Suggested workflow

Merge files → Dedup sheets → Excel to SQL → Import

Related:

FAQ

Can I merge CSV?
Convert with CSV to Excel first.

Only one sheet after merge?
Check that source files actually contain multiple sheets.

Merge only the first sheet per file?
Current version merges all sheets—delete unwanted sheets in source files first.

Formatting preserved?
Sheet copy keeps most cell styles and widths; verify charts and cross-workbook formulas after merge.


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