Postal Code Validator
Free online postal code validator that runs entirely in your browser.
How the Postal Code Validator works
The Postal Code Validator works on Postal codes (one per line) and shows the result as you type. The same input always gives the same answer — refresh the page and you will see exactly the same figure.
Formula used
Postal Code Validator is computed by the formula below, using the inputs you provide.
Inputs used: Postal codes (one per line).
Worked example
Take the default example — postal codes (one per line) of ToolFactory:
- list: BAD ToolFactory ()
- okCount: 0
- total: 1
Frequently asked questions
- Is the Postal Code Validator free?
- Yes. There is no signup, no usage limit and no watermark — the checker runs entirely in your browser.
- Does the Postal Code Validator store or send my data?
- No. Every calculation happens locally in the page, so the numbers you type are never uploaded or logged.
- Does it work on a phone and offline?
- Yes — the page is a single lightweight file that adapts to any screen size. Once it has loaded it keeps working without a network connection.
- What inputs does the Postal Code Validator need?
- Postal codes (one per line). Change any of them and the result updates instantly.