Groom — Phone Number Formatter
Clean up messy phone number datasets with precision and confidence. Powered by Google's libphonenumber library for accurate international formatting.
Results
Validation Errors
Processing Results
Clean, formatted phone numbers ready for use
0 Rows Processed
0 Numbers Found
0 Valid Numbers
0 Invalid Numbers
| Original Input | Formatted Phone | Country | Status |
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| Row # | Original Input | Error Details | Reason |
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Why Use Groom?
Powerful phone number formatting backed by Google's industry-standard libphonenumber library.
Google Library
01
Uses Google's libphonenumber library - the same technology behind Android's phone formatting.
Bulk Processing
02
Process thousands of phone numbers in seconds - perfect for cleaning large customer databases.
International Support
03
Supports phone numbers from every country with proper regional formatting rules.
Smart Validation
04
Automatically detects invalid numbers and provides detailed error reporting.
Flexible Input
05
Upload CSV files or paste text directly - we'll automatically detect and parse phone numbers.
Easy Export
06
Download cleaned data as CSV or copy formatted numbers directly to your clipboard.
Frequently Asked Questions
Everything you need to know about bulk phone number formatting
Type to search through FAQ questions and answers. Use arrow keys to navigate results.
How do I format phone numbers in bulk?
Groom makes bulk phone number formatting simple and fast. Just upload your CSV file or paste phone numbers directly into the text area. Select your default country (for numbers without country codes), choose your output format (international, national, or E.164), and click "Clean & Format". Groom uses Google's libphonenumber library to validate and format your numbers with professional accuracy.
What is Groom and what does it do?
Groom is a free phone number formatter that cleans and standardizes phone numbers in bulk. It's powered by Google's libphonenumber library - the same technology used by Google, WhatsApp, and major telecommunications companies worldwide. Whether you're cleaning CRM data, validating form submissions, or standardizing databases, Groom ensures your phone numbers are correctly formatted and valid.
Is this phone number validation tool free to use?
Yes! Groom is completely free with no hidden fees or subscription plans. You can format and validate unlimited phone numbers with no restrictions. We believe clean data should be accessible to everyone, from small businesses to enterprise organizations.
How accurate is the phone number validation?
Groom uses Google's libphonenumber library, the industry-standard for phone number validation used by Google, WhatsApp, and telecommunications providers worldwide. This library validates against official numbering plans for 200+ countries and regions, ensuring your phone numbers are correctly formatted according to international standards (E.164, national formats, and more).
Can I validate international phone numbers?
Yes! Groom supports phone numbers from 200+ countries and territories. It automatically detects country codes from numbers with international prefixes (+1, +44, +91, etc.). For numbers without country codes, you can set a default country to help Groom format them correctly. The tool validates each number against that country's official numbering plan.
What happens to invalid phone numbers?
Invalid phone numbers are clearly marked in your results with a "INVALID" status indicator. The results table shows both valid and invalid numbers, making it easy to identify which numbers need attention. You can filter the results to see only valid or invalid numbers, and export both sets separately for data cleaning workflows.
How many phone numbers can I process at once?
You can process up to 100,000 phone numbers at once via CSV upload, or up to 10,000 numbers via text input. These limits are designed to maintain fast processing speeds while handling most business use cases. If you need to process more numbers, simply split your data into multiple batches.
What phone number formats can I export?
Groom offers three standardized output formats:
- International (E.164) - Universal format with country code (e.g., +14155552671)
- National - Local format with area code (e.g., (415) 555-2671)
- RFC3966 (tel: URI) - Web-standard format for click-to-call links (e.g., tel:+1-415-555-2671)
What's the difference between international and national format?
International format (E.164) includes the country code and uses + prefix, making it ideal for global databases and international communication (e.g., +14155552671). National format is how locals dial within their own country, without the country code (e.g., (415) 555-2671 in the US). Use international format for CRMs and international systems, national format for local marketing and regional communications.
Can I export phone numbers to CSV or Excel?
Yes! You can download your formatted phone numbers as a CSV file that opens perfectly in Excel, Google Sheets, or any spreadsheet application. The CSV includes all phone numbers with their validation status, formatted output, country code, and original input for easy comparison. You can also copy the results directly to your clipboard for quick pasting.
Is my phone number data secure and private?
Your data is processed securely and never stored permanently. All phone number formatting happens on secure servers with enterprise-grade encryption. We do not store your phone numbers in our database - they're processed in real-time and immediately discarded after export. We never sell, share, or use your data for any purpose other than the formatting service you requested.
Does Groom comply with GDPR and data protection laws?
Yes, Groom is designed with privacy and compliance in mind. We process phone numbers transiently (in real-time without storage), use encryption for all data transmission, and do not retain any personal data after processing. This approach aligns with GDPR principles of data minimization and purpose limitation. However, as with any tool, you remain responsible for ensuring your use of the service complies with applicable laws for your specific situation.
Why are my phone numbers showing as invalid?
Phone numbers may show as invalid for several reasons:
- Wrong default country - If numbers lack country codes, ensure you've selected the correct default country
- Incorrect format - The number doesn't match the country's numbering plan (wrong length, invalid area code)
- Not a real number - The number sequence doesn't exist in that country's allocation
- Extra characters - Letters, multiple spaces, or invalid symbols are present
My CSV file won't upload - what's wrong?
Check these common issues:
- File size - CSVs must be under 100,000 rows. Split larger files into batches.
- File format - Ensure it's a genuine .csv file, not .xlsx or .txt renamed
- Encoding - Use UTF-8 encoding for international characters
- Special characters - Remove or escape commas within phone number fields
Can I automate phone number formatting with Make or Zapier?
Yes! Groom works great with automation platforms. Click the "Automate with Make" button to access our pre-built template for Make.com. You can automatically format phone numbers as new data arrives from forms, CRMs, spreadsheets, or databases. This is perfect for maintaining clean data pipelines and ensuring all phone numbers entering your systems are properly validated and formatted.