Do NFC tags need to be registered or activated?
No. A tag is a chip you write to and read from, with no account behind it, no activation step and no recurring cost. Where registration appears, it belongs to a product or a service somebody has built on top of tags, and that is worth distinguishing before you buy.
There is nothing to register
A tag arrives blank or nearly so. You write to it with a phone, and it works. There is no authority that knows the tag exists and none that needs to.
No account is created, no fee is charged after the purchase, and nothing stops working if a company disappears.
The identifier a tag carries was assigned at manufacture and is not registered to anybody. It names the chip, not an owner.
Where the belief comes from
Products sold as NFC tags that are really subscriptions with a tag included: a card that opens a profile page hosted by the seller, for instance.
The formatting step a new tag sometimes needs, which is a one off preparation performed by your own phone and is not registration.
And experience with other connected objects, most of which genuinely do require an account, which makes the expectation reasonable even though it is wrong here.
The distinction matters commercially: one purchase is an object you own, the other is a service you rent with an object attached.
Products that do require an account
These are legitimate and often good value. A hosted profile, a managed landing page, or a platform that lets you change destinations without touching the tags.
What you are buying there is the service. The tag is the cheapest part and could be replaced with any blank.
The question to ask is what happens if you stop paying, and the honest answers range from you keep a tag pointing at a dead page to you can rewrite it yourself.
A tag pointing at a domain you control avoids the question entirely, which is the argument made throughout this site.
What to establish before buying
Whether the tag is writable and unlocked, since a tag locked to a seller's address is a tag you cannot repurpose.
Whether there is a recurring cost, and what stops working when it stops.
Whether the address written on it belongs to you or to them, which decides whether you can ever move.
And the chip reference and tag type, which are the two facts that decide whether an ordinary phone reads it at all.
Frequently asked questions
Do I need an account to use an NFC tag?
No. You write to it with a phone and it works. Nothing is registered anywhere.
Is there a subscription?
Not for a tag. If a product charges recurring fees, you are buying a service with a tag included.
What about formatting a new tag?
That is a one off preparation your own phone performs. It is not registration and involves nobody else.
Is the identifier registered to me?
No. It was assigned at manufacture and names the chip rather than an owner.