Flyer ID vs Operator ID: which one goes on the drone?

These rules are for the UK. If you fly under EASA rules in an EU country, the IDs, the fees and the registration system are all different.

The Operator ID goes on the drone. The Flyer ID never does. The CAA’s instruction is literally “Always label with your Operator ID, not your Flyer ID.” (CAA, Labelling your drone or model aircraft)

If you’ve already labelled a drone with your Flyer ID, that aircraft is not compliant. Scrape the label off and redo it. The rest of this page explains why there are two numbers, how to tell which is which in the email the CAA sent you, and the one part of your ID you must never print.

The two IDs in one table

	Flyer ID	Operator ID
What it proves	You passed the theory test and know how to fly safely and legally	You’re the person or organisation responsible for the aircraft
Who holds it	The person at the controls	The owner / person responsible (often the same person)
Cost	£0	£12.34 (as of July 2026)
Valid for	5 years	1 year, renewed annually
Minimum age	13 to get one by yourself; under-13s get one through a parent or guardian	18
Goes on the aircraft?	No, never	Yes, on every aircraft you’re responsible for

Sources: Get a Flyer ID, Get an Operator ID, Flyer IDs and Operator IDs.

Most people get both at the same time and never think about the difference again, until it’s time to put a sticker on the drone.

What each one actually is

The Flyer ID is about you. You take a free online theory test; passing it “shows you understand how to fly safely and legally” and “allows you to do basic low-risk flying in the Open Category” (CAA). It’s a licence to be the person holding the controller. It has nothing to do with any particular aircraft, which is exactly why it doesn’t belong on one.

The Operator ID is about the aircraft. The operator is “the person or organisation that’s responsible for maintaining and managing a drone or model aircraft” (CAA). It’s a registration, not a test. You pay for it, it’s tied to you as the responsible party, and you “can use the same Operator ID for all your drones and model aircraft”: one number, every airframe you own.

That’s the whole logic of the labelling rule. If someone finds your drone in a hedge, the number on it needs to point at the person who is legally answerable for it. That’s the operator, not whoever happened to be flying.

Do you even need each one?

Since 1 January 2026 the registration triggers are:

Flyer ID: required for anything 100 g or more, camera or no camera, up to 25 kg. Below 100 g it’s recommended, not required. (CAA registration guidance)
Operator ID: required if the aircraft is 250 g or more, or has a camera and weighs 100 g or more, or can transfer more than 80 joules of kinetic energy on impact. (Article 14(5)(a), as substituted by SI 2025/1106 reg 22)

Two things changed on 1 January 2026 that older guides still get wrong. There used to be no weight floor at all on the camera trigger: a 60 g camera drone needed registering. Now there’s a hard 100 g floor. And the old “unless it’s a toy” exemption under the Toys (Safety) Regulations 2011 was deleted outright. If a page tells you your camera drone is exempt because it’s a toy, that page is out of date.

Under 18? You can hold a Flyer ID from 13 and fly on it. You cannot hold an Operator ID. A parent or guardian registers as the operator and the drone carries their Operator ID. Since 1 January 2026 that 18+ rule is statutory, not just CAA policy (SI 2025/1106 reg 22(b)).

How to tell them apart in a CAA email

The CAA sends both, sometimes minutes apart, and the emails look similar enough to mix up. Three reliable tells, in order of how much you can trust them:

1. Where it came from. The Flyer ID arrives with your theory test pass. The Operator ID arrives with your registration confirmation, the one you paid £12.34 for. Payment means Operator ID, every time.

2. The Operator ID starts GBR-OP-. The CAA publishes the format in AMC1 Article 14(6) (CAA ORS9 Decision No. 16): 17 alphanumerics, upper case, in three sections:

GBR: three fixed characters, the ISO 3166 country code
OP: a fixed field meaning “Operator”
twelve randomly generated upper-case alphanumerics

Two caveats worth having. The hyphens you see everywhere are display separators, not part of the identifier: 3 + 2 + 12 comes to 17 only if you don’t count them. And the CAA excludes A, E, I, O, U, 1 and 0 when it issues those twelve characters, which strips out the 0/O and 1/I confusion pairs before they can cause a misread. That’s an issuance rule. It doesn’t mean an ID containing one of those characters is fake: no CAA source claims every number in circulation conforms, so don’t use it as a validity test on someone else’s ID.

3. The Flyer ID has no published format. The CAA doesn’t publish one. Secondary sources that claim to know the shape of a Flyer ID disagree with each other, so identify yours by which email it came in, not by counting its characters. If you’re stuck, both IDs are visible in the My registration area of your CAA account. That’s the only source worth trusting.

About “GBR-OP-1234567”

You will find this format quoted widely, including by UK drone retailers. Heliguy’s own Flyer ID vs Operator ID guide gives “Receive your unique Operator ID (e.g., GBR-OP-1234567)” (Heliguy, checked 28 July 2026). It’s provably wrong against the CAA spec: seven digits where the spec says twelve alphanumerics. It’s almost certainly where the persistent “an Operator ID is seven digits” belief comes from.

The practical damage is that people who’ve read it look at their real 12-character ID, decide they’ve been given the wrong thing, and either don’t label at all or label with something else. If you counted your characters and got twelve, you have a correct Operator ID.

Never print the last three characters of your Remote ID

Your Remote ID is a third number, and this is where people get caught out. Every registered operator is issued one (“We provide all registered operators with a Remote ID number”), and the CAA warns that it “is similar to your Operator ID, but not exactly the same” (CAA, Remote ID).

Its structure, per the CAA’s own example:

Country identifier: three upper-case characters
Public part: 12 characters, lower case and numbers
Checksum: 1 number or lower-case letter
Private key: 3 characters, lower case and numbers

That last block is the problem. The CAA’s instructions are unambiguous:

“Keep your private key secure so that nobody else can use it.” “Never write your private key on your drone or model aircraft.” “Never share your private key and avoid writing it down.”

The private key is what stops someone else broadcasting as you. Printed on a sticker, on the outside of an aircraft, it is readable by anyone who picks the thing up. If you think yours has been exposed, email drone.registration@caa.co.uk and ask for a new one.

Also note the Remote ID number is case sensitive, unlike the Operator ID, which is upper case throughout. If you’re transcribing one and reflexively capitalising it, you’re producing a different number.

So: label with the Operator ID. It has no private key, it’s the number the CAA tells you to use, and using it means there’s nothing on the outside of your drone that shouldn’t be there.

How the label itself has to look

Once you have the right number, the CAA’s requirements are short (Labelling your drone or model aircraft, and Drone Code point 31):

On the main body of the aircraft, not a battery, not a propeller, not the case
Visible from the outside, or inside a compartment you can open without a tool
Block capitals, taller than 3 mm
Secure and safe from damage
The same Operator ID on every drone and model aircraft you’re responsible for

And the part people skip: “You must label every drone or model aircraft that requires an Operator ID. It is against the law not to do this.” The label isn’t paperwork you keep in a drawer. It’s a condition of the aircraft being legal to fly.

Next step

You know which number to print. Open the generator: type your Operator ID, check the preview, download a print-ready A4 sheet of 36 stickers. It runs entirely in your browser, so the number never leaves your machine.

Fees and thresholds on this page verified against CAA and legislation.gov.uk sources on 28 July 2026. The £12.34 Operator ID fee is reviewed roughly annually. Check Get an Operator ID before quoting it.