CSV to Excel
Convert a CSV file to Excel (.xlsx) in your browser. Download a real spreadsheet — nothing is uploaded.
Excel validator
Validate an Excel workbook for empty sheets, empty columns, and missing data in your browser.
Drop an Excel file here or click to choose
Validated locally — nothing is uploaded
How to use Excel validator
Validate an Excel workbook for empty sheets, inconsistent columns, and parse issues.
Everything runs locally in your browser — your files are never uploaded to a server.
Excel validator FAQs
How do I validate an Excel file?
Drop a workbook to check for missing sheets, empty columns, and sheets with no data. Review issues before using the file elsewhere.
Is the Excel validator free?
Yes. Every Excel and CSV tool on ReallyUseful.Tools is free to use, with no account or subscription required.
Are my files uploaded?
No. Files are processed in your browser on this device. Nothing is uploaded to our servers.
Do I need Microsoft Excel installed?
No. These tools run in a modern web browser, so you do not need Microsoft Excel or desktop spreadsheet software installed.
More Excel/CSV
Excel to CSV
Convert Excel .xlsx or .xls to CSV in your browser. Choose a sheet and delimiter, then download.
CSV viewer
Open and browse a CSV in a paginated table in your browser. No upload — view large files locally.
Merge CSV files
Combine multiple CSV files into one in your browser. Rows are stacked and headers aligned by name.
CSV to XML
Convert CSV rows into structured XML in your browser. Each row becomes an element — nothing is uploaded.