29mm On-Metal NTAG213

Normal NFC tags do not work when placed directly onto metal surfaces. Therefore, when using NFC tags on metal you either need to create a gap of at least 0.5 cm between the tag and the metal or you can use a special tag - called an 'on-metal' tag - which has an additional ferrite barrier material between the NFC tag and the adhesive. 

On-metal tags will work on both metal and non-metal surfaces. However, on-metal tag scan distances always tend to be slightly less than standard NFC tags so unless you need tags that will (or might) go on metal, we would strongly recommend that you go with standard tags. 

For more information and details of how on-metal tags compare with normal tags, read our on-metal NFC tag guide. 

Encoding Yourself

You can encode your tags with a smartphone and it's quick and easy.

1. Download the NFC tools app - it's free for both iPhone and Android users
2. Open the app and tap 'Write', then add a record
3. Tap 'Custom URL/URI', and then copy and paste your URL into the given text box.
4. Tap OK, and then tap 'Write'
5. Hold your phone over the tag, and your tag will encode. That's it !

For more information, have a look at our How to encode tags with an iPhone and How to encode tags with an Android phone pages. 

Encoding by Seritag

Seritag have fast and accurate encoding services when you need a large number of tags encoded or you want to be absolutely sure that the encoding is handled correctly. 

For full information on how to order your NFC tags encoded by Seritag, read our Ordering NFC Tags with Encoding advice page.