Excel File Merger - Combine Multiple Workbooks Instantly

Combine monthly reports, multi-region exports, and scattered sheets into one workbook — no copy-paste

100% Local Processing No Upload Required
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Upload Multiple Excel Files to Merge

Select 2-20 Excel files (.xlsx or .xls) to merge and combine into one workbook

Supported: .xlsx, .xls

Excel File Merger - Combine Multiple Workbooks Instantly

Combine monthly reports, multi-region exports, and scattered sheets into one workbook — no copy-paste

  • Supported: .xlsx, .xls
  • Local processing with privacy by design
  • Millions of rows, instant
  • Keep formulas & formats

Common use cases

When data lives in a dozen separate files, one merge saves hours of manual work

Consolidate monthly reports

Combine 12 monthly P&L files into one annual workbook — each month becomes a separate sheet, ready for pivot analysis.

Unify multi-region sales data

Stack regional sales exports (APAC / EMEA / Americas) into one master table for company-wide reporting.

Roll up team headcount sheets

Merge per-department roster files into a single workbook so HR can run org-wide queries without VLOOKUP gymnastics.

Best practices

File preparation

Use identical column names across files when merging by rows. Remove trailing blank rows from each source file before uploading.

Data security

All files are merged in your browser using SheetJS — nothing leaves your device, no upload server is involved.

Performance

For 10+ large files, close other browser tabs. Sheet-mode merge is faster than row-mode for files with very different schemas.

Result accuracy

Enable "Add source column" to track which row came from which file — invaluable when debugging totals that don't reconcile.

Frequently Asked Questions

What file formats can be merged together?

You can mix .xlsx, .xls and .csv files in a single merge job. Output is always .xlsx.

Is there a limit on the number of files?

You can merge 2–20 files at once. For very large batches, run multiple merges and combine the results.

Do my columns need to match across files?

For row-mode merge, yes — files should share the same header row. For sheet-mode merge, each file becomes its own tab and columns can differ freely.

Will headers be duplicated in the output?

No. With "Include headers" enabled, only the header row from the first file is kept; the others are skipped automatically.

Choose a topic to get started

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Tutorials