Merge Multiple Excel Files Into One Sheet Online

    Combine dozens of workbooks into a single sheet without uploading anything. Drop your .xlsx or .xls files below, map any columns whose headers differ, and download the merged result. Everything runs in your browser.

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    Merging Excel Files Without the Copy-Paste

    When Headers Do Not Match

    The usual reason a merge produces half-empty columns is that the source files label the same field differently. "First Name", "FirstName" and "first_name" are three distinct columns as far as a naive merge is concerned. FileMerger detects near-matching headers and offers to map them onto one another, so the merged sheet ends up with a single populated column instead of three sparse ones. Review the suggested mapping before exporting, particularly when two genuinely different fields have similar names.

    Multiple Sheets Inside One Workbook

    An .xlsx file can hold many worksheets, and which of them you want is rarely obvious to a tool. FileMerger reads every sheet in every file you supply and lets you pick which ones take part in the merge. This matters when workbooks carry a data sheet alongside a summary or pivot tab: including the summary would inject subtotal rows into your merged output and quietly inflate every figure downstream.

    Formatting, Formulas and What Survives

    A merge combines values, not presentation. Cell colours, conditional formatting and column widths are not carried across, and formulas are resolved to the values they had when the file was saved rather than being rewritten to point at their new locations. That last point is the one to watch: a formula referring to another sheet in its original workbook cannot mean the same thing after the merge, so exporting values is the only safe behaviour. Dates are preserved as dates rather than being flattened into serial numbers.