I have my holder’s number
Use it only on NS&I’s official website. This site has no holder’s-number field and does not receive or store that number.
Check with NS&I ↗Independent • private by default
Premium Bonds Prize Checker
Use NS&I’s official Prize Checker with your holder’s number for an account-level result. If you have individual bond numbers, this independent tool can compare them locally with a winning-numbers ZIP you downloaded from NS&I. The file and numbers stay in your browser. A local match is not proof of ownership, entitlement or payment, so confirm every result with NS&I.
Independent service. Always verify results on NS&I’s official Prize Checker.
I have one or more bond numbers
Download a winning-numbers ZIP from NS&I, then select the file here. Processing and matching stay in this browser.
Open NS&I winning-bonds downloads ↗Import data locally
- Visit the official NS&I winning-bonds downloads page.
- Download the monthly ZIP yourself.
- Choose the matching draw month and select that ZIP below.
- Wait for strict local validation, then enter bond numbers.
No data imported yet. Select a monthly ZIP before entering bond numbers.
Preparing…
Check bond numbers against the imported dataset
Local only. Your bond numbers stay in this browser and are never uploaded.
Historical report serials may start with up to three digits, followed by two letters and six digits. Maximum 5,000 lines.
What this checker can do
It can find exact matches in the validated dataset you imported and show the report month and prize amount recorded there.
What it cannot do
It cannot prove ownership, entitlement, payment status, account status or coverage outside your imported data. It is not an NS&I query.
How to interpret the result
| Result shown | Meaning | Next action |
|---|---|---|
| No local match | The bond number was not found in the validated file you selected. | Check the file month and confirm account-level results with NS&I. |
| Local match | The bond number appears in your imported dataset. | Confirm ownership, entitlement and payment directly with NS&I. |
| File rejected | The ZIP did not pass strict format or date validation. | Download the correct monthly file from NS&I and try again. |
Method and limitations
This tool uses only the inputs and dated parameters shown on the page. A local match is not proof of ownership, entitlement or payment. Confirm account-level information directly with NS&I.