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Find the complete printer model on the machine, then use its regional manufacturer's supplies list to confirm the cartridge or bottle family. Do not select ink from the brand name, case colour or the closest-looking product photograph.
In this guide
Start with the machine itselfConfirm the right kind of supplyUse two independent checksWhy neighbouring numbers are riskyTurn the family into a shopping listIf you still cannot identify itThe exact letters and numbers matter. Similar printers can use different ink, and a machine bought abroad may need a different regional consumable from a visually identical UK model.
Start with the machine itself
Look for the model name on the front or upper casing. If it is incomplete or unclear, use the identification location described by the manufacturer. Record the full suffix, not just a broad name such as DeskJet, PIXMA, WorkForce or EcoTank.
A serial number identifies an individual machine; it is not normally the model name you should enter into an ink search. Avoid posting serial numbers, account details or personal labels publicly when asking for help.
If the printer is inaccessible, its installed software or purchase documents can provide a clue, but verify against the machine when possible. A computer may retain an old printer entry after the physical printer has been replaced.
Confirm the right kind of supply
| Printer system | What you are looking for |
|---|---|
| Cartridge inkjet | Exact cartridge family and colour |
| Refillable ink tank | Exact bottle series and tank colour |
| Laser printer | Toner, not an ink cartridge |
| Separate imaging components | Whether the warning concerns toner, drum or another part |
| Subscription setup | Supply and account conditions as well as model |
Do not pour bottle ink into a cartridge printer or buy toner because a general search calls every printer supply ink. Read the exact warning before deciding what needs replacement.
Use two independent checks
First, find the supplies listed for the complete model in the appropriate regional manufacturer information. Second, compare the exact replacement product's compatibility and label with that requirement.
An old cartridge is useful evidence if it is known to have worked correctly. It is less reliable on a second-hand machine that arrived with an error or a wrong cartridge already installed.
Use our Find Ink directory to move from the model to the relevant range. If the exact model is absent, ask rather than picking the next number in the list.
Why neighbouring numbers are risky
Epson 603XL and 604XL are different families. The shared XL suffix describes capacity, not interchangeability. Similarly, Brother LC421XL, LC422XL and LC426XL must not be chosen as progressively larger sizes for one printer.
Canon families can contain different black positions, while HP photo black can be distinct from ordinary black. A product that says black is not enough if the printer has two different black supplies.
For tank printers, the EcoTank name alone does not identify the bottle series. Our 102/104 guide illustrates why similar model and bottle numbers still need exact matching.
Turn the family into a shopping list
After confirming the family, record the required colours and quantities. A tri-colour cartridge is one physical cartridge containing several colours; it is not three separately replaceable tanks. A set plus extra black is not two complete sets.
Decide standard or XL only within supported products for that family. Read the capacity of each component and keep original and compatible specifications separate.
Check subscription status where relevant. An activated HP+ printer's original-cartridge requirement is not removed by choosing a compatible with the correct family number. A second-hand machine's account context deserves a check before purchase.
If you still cannot identify it
Send a clear photograph of the printer's model label, the installed supply labels and any error message through the retailer's normal support route. Explain where the printer was purchased if it may be imported.
Do not open a new pack merely to see whether it fits. Keep it sealed until the series and colour are confirmed. Physical insertion is not a substitute for compatibility evidence and forcing a cartridge can create damage.
Is the serial number the ink code?
No. Use the model to find its supplies, then compare the cartridge or bottle code.
Can I search only by printer brand?
That produces many unrelated ranges. The complete model is needed to narrow the choice safely.
Is the old cartridge always correct?
Not if the machine's history is uncertain or it never worked with that cartridge. Cross-check manufacturer information.
What if a search result disagrees with the model page?
Pause and compare the regional manufacturer source and actual product specification. Ask for clarification rather than selecting the cheaper interpretation.
