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Postal and ZIP Code Formatter

Fix the spacing and case of postcodes, and spot invalid ones.

  • Free
  • No sign-up
  • Nothing is sent or stored
0 characters

The calculation happens instantly in your browser. The numbers you enter are not sent to our servers or saved.

How to use the Postal & ZIP Code Formatter

  1. Choose the country.
  2. Paste codes, one per line.
  3. Copy the formatted list — problem codes are flagged.

What does this tool do?

Postal codes typed by people are messy: sw1a1aa, SW1A-1AA, sw1a 1aa. The formatter normalises them to the official style, such as SW1A 1AA in the UK or K1A 0B1 in Canada.

Each country's pattern is checked, so codes with the wrong number of characters stand out before they cause failed deliveries.

Why use it?

  • 12 countries.
  • Bulk cleanup.
  • Invalid codes flagged.

Accuracy and limits

  • Validates the format, not whether the postcode is actually in use.

Privacy

The calculation happens instantly in your browser. The numbers you enter are not sent to our servers or saved. There's no account to create and nothing to install.

Last reviewed by the M2Toolkit team.

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