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A UID must always be read when the NFC chip is used to identify a specific product (e.g. a garment) or security measures (seals) are associated with the NFC chip. Find out more about possible everyday applications of NFC tags here.
A UID is an identification number consisting of letters and numbers, 7 bytes in size. The UID is globally unique, read-only and can be read by most NFC devices and all NFC-enabled smartphones. The UID cannot be deleted or changed, so each NFC chip is uniquely identified.
In this article, we explain how to read the UID with Android.
Content:
Reading the UID of an NFC tag
To read the UID of an NFC tag with a Windows computer, you need an NFC reader/writer and the software NFC21 Tools.
Connect the NFC reader/writer to your computer via USB and then start the NFC21 Reader software.
Then right-click on the NFC icon in your taskbar. In the menu, click on Settings.
In the settings window, activate the check mark next to Read UID.
Now the UID is automatically copied to the clipboard or pasted into an open text field if the NFC chip is held over the reader.
Summary
In this article we have briefly explained how the UID of any NFC chip can be read with windows.
First published: 19.08.2025 / Updated: 19.08.2025