How to use
- Paste the value into the validation field.
- Review format and check-digit feedback.
- Fix the input if needed — nothing is sent to a server.
What it's for
Validate Swedish postcodes.
About the document
Swedish postnummer are 5 digits, often written as XXX XX.
Also useful
Need an example? Try the postnummer generator.
Vanliga frågor
- Does this query official databases?
- No. Validation is algorithmic and local only.
- Does data leave my browser?
- No. Everything runs locally on your device.
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