Data Validation
See how we validate UK phone numbers, postcodes, NI numbers, sort codes, and email addresses according to UK standards.
Try with Example Data
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Load sample data to try the tool
A sample dataset with UK phone numbers, NI numbers, postcodes, sort codes, emails, and names. You’ll pick columns, clean, then export — all in your browser.
No sign-up. No uploads. Your data stays private.
example-data.csv
Sample dataset loaded
Select columns to clean
Pick which columns contain UK data to validate. Use Auto-Select to detect phone, NI, postcode, sort code, email, and name columns automatically.
Phone Number Format
Choose how you want phone numbers formatted in the output
Custom email domain corrections
Add your own domain typo fixes (e.g. my-orgcom → myorg.com). One per line: typo → correct or typo=correct.
Results
Total Rows
0
Valid
0
Cleaned
0
Issues
0
Sample of validated fields (prioritizes rows where values were changed)
| Row | Column | Original | Cleaned |
|---|
Important: Download and Save Your File
Your cleaned data is only available in your browser session. Once you close this tab or refresh the page, your cleaned data will be gone. We don't store files on our servers — make sure to download and save your file immediately!
Download Options - Customize Your Export
Choose your preferred format and export options before downloading your cleaned file:
You can download in any format, regardless of what you uploaded!
Data Cleaning Options:
Export Customisation:
What You'll Experience
Everything in your browser — no uploads, no servers.
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.