How can I validate ZIP codes / postal codes?

If you wish to collect ZIP or postal codes, our ZIP code field is the perfect way to do it.

Open the form builder and click the "ZIP / postal code" field to insert this field:

While the field is selected, you can choose from 3 formats:

• ZIP code (USA)
• Postal code (CA)
• Post code (UK)

Notes on validation are as follows:

Zip code - USA

• Only allows numbers to be typed into the field
• Causes the numeric keyboard on mobile devices to be shown
• Requires a 6 digit numeric code (eg. 90210) OR the new Zip+4 format (eg. 90210-1234)

Postal code - Canada

• Requires a six-character alphanumeric code with alternating letters and numbers (e.g. K1A 0B1)
• Allows for an optional space or hyphen to be inserted between the third and fourth characters (e.g. K1A-0B1 or K1A 0B1).

Postcode - UK

• Requires either a 6 or 7 character alphanumeric code in specific formats (eg. EC1A 1BB, W1A 0AX, M1 1AE).

  The pattern must match the following regular expression:^[A-Za-z]{1,2}[0-9Rr][0-9A-Za-z]? ?[0-9][A-Za-z]{2}$

  • Starts with 1 or 2 letters
  • Followed by a digit
  • Optionally followed by an alphanumeric character
  • May have a single space
  • Ends with a digit and 2 letters (case-insensitive)