Use the Bulk Phone Normalizer here to clean a messy CSV phone column before import. Safe rows are converted to E.164, the rest of each row stays intact, and risky rows are split into a separate needs-review file.
Quick answer
This tool cleans a messy CSV phone column, converts safe rows to E.164, preserves the rest of each row, and sends unclear or risky rows to a separate needs-review file before CRM or API import. Processing happens locally in your browser with no server upload or CSV retention.
Drag and drop a CSV export here, or click to browse from your computer.
The tool will clean the phone column, keep safe rows import-ready, and separate risky rows into a needs-review file.
Processed locally in your browser. No server upload. No CSV retention. On slower devices, very large files may take longer to process or make the page temporarily unresponsive.
Drag and drop your file. Data stays local in your browser.
Choose which column holds phone numbers and optionally a country column.
The tool cleans formats, validates structure, and applies E.164 rules.
Get separate cleaned and needs-review files ready for CRM import.
CRMs, dialers, and communication tools often reject CSV imports when phone columns contain invalid or inconsistent number structures.
Many calling tools work best when imported phone numbers already use E.164 format, especially for international dialing.
Isolate rows with extensions, multiple numbers, or extra notes before they create import problems or messy records.
Keep your imported phone data in one predictable format so downstream systems and workflows are easier to trust.
E.164 is the international phone-number standard used by many CRMs, dialers, and APIs: a plus sign, country code, and subscriber number with no extra formatting characters. Read the full explainer to see why it matters before CSV import.
Not ready to use your own data? Open our sample phone import CSV to see messy inputs, cleaned E.164 output, and risky rows that get separated into a needs-review file before you test your real import.
| name | phone |
|---|---|
| John Doe | (555) 123-4567 |
| Jane Smith | 07700 900077 |
| Messy Data | 800-555-0199 x123 |
No. All processing happens entirely within your web browser using JavaScript. We do not upload your CSV file or its contents to any server.
Rows are flagged when the cell contains extensions (x123), text notes, or multiple numbers. See how the tool handles needs-review rows before you import.
Select a country column during configuration. The tool will parse each row using its specific country code.
You can optionally provide a default country during setup for local-format numbers. If your CSV contains mixed-country data, leaving it blank is safer so ambiguous rows can be reviewed instead of guessed.