Merge Excel Files

Monthly rollups — Combine twelve monthly reports into a single annual workbook, one sheet per source file.

Collecting from branches — Regional offices send identical templates; merge them to compare results side by side.

Archiving — Bundle related workbooks into one file instead of keeping dozens of small attachments.

Merging is easy to confuse with a few related jobs, so pick the right tool before you upload:

• Merge Excel files (this page) — combines several workbooks into one workbook where every original sheet stays its own tab. Nothing is stacked or joined: a sheet named January in file A remains a separate sheet next to a sheet named January in file B, renamed automatically if the names collide.
• Merge sheets into one — the opposite direction: it takes the many sheets inside a single workbook and stacks them vertically into one flat table, aligning headers and optionally adding a source-sheet column.
• Join Excel tables — a database-style left join that enriches one table with columns looked up from another table by a shared key column, instead of collecting whole sheets.
• Compare Excel files — highlights the cells that differ between two versions of a workbook rather than combining them.
• Remove duplicates from Excel — merged archives often contain repeated rows; this tool deduplicates a sheet by the columns you choose.

Everything runs locally in your browser. The files are parsed in memory, combined into a new workbook structure, and written back as a single .xlsx download — nothing is uploaded to a server. That makes the tool suitable for payroll exports, financial statements, or client data that should never leave your machine.

Sheets keep their original names whenever possible. When two incoming files contain a sheet with the same name, the later one is prefixed with its file name so you can still tell them apart. Internal metadata sheets created by the editor are skipped automatically. Cell values, dates, and number formats survive the merge; highly specific styling such as conditional formatting rules may be simplified in the output.