Free Excel Tools Online: Merge & Split XLSX Files 2026
Merge several Excel files into one or split a big one into many, free in your browser.
Work with spreadsheets with nothing to install: combine several Excel files into one workbook or split a big one into manageable files.
By VOV · Last updated: October 21, 2026
Drag your .xlsx files here or
Each original file will become a sheet of the merged workbook.
Drag your .xlsx files here or
Files will download one after another.
How it works
How it works: the SheetJS library loads in your browser and reads/writes .xlsx files locally. When merging, each file becomes a sheet; when splitting, new files are generated per sheet or per row blocks. Nothing is uploaded to any server.
Use cases
- Merge 12 monthly sales Excel files into one without copying and pasting sheet by sheet
- Split a 5000-row customer database into separate files automatically, one file for each sales region
- Convert your spreadsheet to a clean CSV to import it into your business accounting system
Frequently asked questions
Are my files uploaded to any server?
No. SheetJS works 100% in your browser: files never leave your device.
What formats are accepted?
.xlsx (modern Excel). Old .xls and .csv are not supported by this tool.
Are formulas and formatting kept?
Values yes; complex formulas and advanced formatting may be simplified when rewriting the file.
Is there a size limit?
It depends on your device memory: files up to tens of MB work fine.