Free tool
Clean and normalize phone numbers in a CSV.
Turn '(415) 555-1234', '4155551234', '+1 415.555.1234', and '415-555-1234' into one clean, consistent format across every row.
Everything runs in your browser. Nothing is uploaded.
Drop a CSV or Excel file here
Or choose a file — nothing leaves your browser.
After you drop a file, you'll see the Normalize phone numbers action highlighted for you.
Common questions
Which formats can I output?
E.164 (+14155551234), US pretty ((415) 555-1234), and digits only (4155551234).
Does it work for non-US numbers?
Numbers starting with '+' are preserved as E.164-style digits. Full per-country parsing is on the roadmap.
Does it check whether numbers are real?
No — it normalizes format only. Carrier lookup requires a paid data source.
Is my file uploaded anywhere?
No. The file is parsed and processed entirely in your browser using JavaScript. It never leaves your device, and nothing is stored on our servers.