Spreadsheet Data Validator
Check a selected column for blanks, duplicates, emails, numbers, or dates.
Choose XLSX or CSV, then load your worksheets. The first row is a header. Downloads contain values; original formulas and formatting are not preserved.
Working with many files? Open batch processing for supported operations. Batch uses its own basic options.
How to use Spreadsheet Data Validator
- Choose a supported file from your device. Spreadsheets are inspected automatically; choose the worksheet when the list appears.
- Set the options for this task: Column number — Columns start at 1. The first row is treated as headers; Rule.
- Run the tool, review the result, and use the copy or download option provided.
Continue your workflow
Clean a sales export — Keep product codes intact while preparing a report.
What to expect
Choose XLSX or CSV, then load your worksheets. The first row is a header. Downloads contain values; original formulas and formatting are not preserved.
Local processing
Your files and inputs are processed in your browser and are not uploaded. Download or copy results before leaving. Normal site and library requests still reach the hosting service.
Frequently asked questions
What does Spreadsheet Data Validator do?
Check a selected column for blanks, duplicates, emails, numbers, or dates. Choose XLSX or CSV, then load your worksheets. The first row is a header. Downloads contain values; original formulas and formatting are not preserved.
Are my files or input sent to a server?
Your files are processed locally in your browser and are not uploaded. Text inputs and passwords also stay in the tool on your device. The hosting service still receives normal requests needed to serve the website.
Can I recover a result after closing the page?
Download or copy your result before closing or reloading. Optional local history stores tool names and activity counts, not your inputs, passwords, filenames, or results.