First Chrome extension for checking Premium Bonds on NS&I
Been working on my first Chrome extension and thought I'd share what I've made.
It's basically a small improvement for the NS&I Premium Bonds prize checker. If you're checking multiple people's bonds, you normally have to keep finding and typing their holder numbers in, so I've added a way to save them and give them names like "Dad", "Mum", etc.
You can then just click the saved number you want to check instead of typing it again. You can rename/remove them as well, and I've added some validation so obviously incorrect holder numbers don't get saved.
I've tried to keep it really simple and only change the prize checker itself. It doesn't touch the NS&I login or account pages.
It's unofficial and nothing to do with NS&I, just something I thought would make their prize checker a bit easier to use.
Google has approved it on the Chrome Web Store now, so it's actually live 🎉
First Chrome extension I've published, so I'd be interested to hear what people think or anything I could improve.
Chrome Web Store: https://chromewebstore.google.com/detail/holnjpalcgeigodbkmpdfgmkbngjfpmc?utm_source=item-share-cb
Posted Aug 13, 2026, 8:34 PM UTC