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Excel Merger

Many workbooks in, one sheet out.

  1. Load two or more workbooks
  2. Pick a sheet per file
  3. Download merged_output.xlsx

Runs in your browser. Nothing you load here is uploaded or stored.

Step 1

Load your spreadsheets

The first file in the list sets the column order. One sheet per file goes into the merge — the first sheet unless you pick another.

Files to merge, in order

    No files loaded yet.

    Step 2

    Choose how headers combine

    Any difference stops the merge and names the first mismatch per file.
    Step 3

    Preview and download

    The output is merged_output.xlsx — one sheet, values only (formulas become their results), dates kept as real dates.

    Load a file to see a preview.

    Each file contributes one sheet — the first by default, or any other you pick from its dropdown. Dates are read as real dates and written back as real dates (cellDates in and out), so the merged file sorts and filters the way the originals did.

    Limits

    • Up to 200,000 rows or 50 MB across all files; past that it stops with a message.
    • Old .xls files read noticeably slower than .xlsx — give big ones a moment.
    • The output is one sheet of values — formulas are replaced by their last calculated result, and formatting is not carried over.

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