Merge Excel Files — Online Workbook Combiner
Combine multiple Excel workbooks into one file in seconds. Merge all sheets into a single workbook or stack matching tables row by row — fully in your browser, no upload.
Why merge Excel files with AnyDocFlow?
Combine Workbooks
Merge every sheet from multiple .xlsx and .xls files into one workbook — sheet name conflicts are resolved automatically, so nothing is overwritten.
Stack Data Rows
Append matching tables under a single header, skipping duplicate header rows. Perfect for monthly reports, department exports, and survey dumps.
Smart Sheet Naming
Duplicate sheet names are renamed automatically (Data, Data 2, Data 3), and CSV/TSV files become clearly-named sheets in the combined workbook.
Reorder & One-Click Download
Reorder files with the arrow buttons to control output order, then download the combined workbook as a single .xlsx with one click.
No Excel or Office Required
Everything runs in your browser with SheetJS. No Microsoft Excel, no plugins, and nothing to install.
100% Private & Free
Files never leave your device. Merging is fully local, free, and works without an account or registration.
About merging Excel files
Combining spreadsheets is one of the most common data tasks there is — consolidating monthly reports, joining exports from different departments, or merging CSV dumps into a single file. AnyDocFlow's Excel merger gives you two ways to do it. Combine merges every sheet from every file into one workbook, renaming duplicates so nothing is lost. Stack appends the rows of every sheet from every file under a single header, skipping repeated header rows — so a workbook with monthly tabs or per-region sheets contributes all of its data, not just the first sheet. Both modes run entirely in your browser with SheetJS, so your data never touches a server, there is no upload, and there is no sign-up.
How to merge Excel files
Three simple steps — no account, no software, and no data leaving your device.
Add your files
Click the drop zone or drag .xlsx, .xls, .csv, or .tsv files into the page. You can add several files at once and reorder them with the arrows.
Choose a merge mode
Combine puts every sheet into one workbook; Stack appends the rows of every sheet under a single header, skipping repeated header rows. Pick whichever matches your data.
Download your workbook
Click Merge, and the combined workbook downloads as a single .xlsx file — ready to open in Excel, LibreOffice, or Google Sheets.
Notes
Files of any size are processed locally in your browser — nothing is uploaded. Combine mode keeps every sheet and auto-renames duplicates ('Data', 'Data 2', …); CSV/TSV files become sheets named after the file. Stack mode uses every sheet from every file: the first sheet's first row becomes the header, sheets that start with that same header row contribute only their data rows so the header isn't repeated, and rows align by column position. Completely empty rows are dropped.