Try Simple Data Cleaner - Interactive Demo

Try with Example Data

Your files are processed in your browser - 100% private & secure

Click to load example data

Sample dataset with UK data formats ready to explore

Total Rows

Valid

Cleaned

Issues

Download Options - Customize Your Export

Choose your preferred format and export options before downloading your cleaned file:

Select Your Download Format:

You can download in any format, regardless of what you uploaded!

Data Cleaning Options:

Remove Duplicate Rows (Keep First Occurrence) Checking for duplicates... In the Full Preview tab: Blue = original rows with duplicates, Yellow = duplicate rows to be removed.

Clean Whitespace in All Cells Remove leading/trailing spaces and extra spaces between words. Already applied to cleaned fields, this ensures all other columns are clean too.

Export Only Rows With Issues (Optional) When checked, you'll download only the rows that have validation issues (instead of the full file). Perfect for creating a focused review file to fix manually before merging back into your main dataset.

What You'll Experience

Data Validation

See how we validate UK phone numbers, postcodes, NI numbers, and sort codes according to HMRC standards.

Detailed Reports

Explore comprehensive HTML reports showing issues, cleaned data, and full previews with explanations.

100% Private

All processing happens in your browser. Your data never leaves your device - perfect for sensitive information.

Export Options

Download cleaned data in CSV, Excel, or JSON format. Filter to only rows with issues if needed.

Try with Example Data

Select columns to clean:

Phone Number Format:

View Full Preview Report

View Cleaned Data Report