Buying ink for an Epson printer can look more complicated than it really is.

Some Epson printers use individual ink cartridges. Others offer standard and XL versions of the same cartridge family. EcoTank printers work differently again, using refillable ink tanks and bottles instead of conventional cartridges.

The important thing is that Epson ink is matched to the exact printer model. There is no universal Epson cartridge that fits every Epson printer.

Once you know your printer model and the ink family it uses, finding the correct replacement becomes much easier.

Epson ink is model-specific, not brand-wide

The single most useful thing to understand about Epson ink is that cartridges are not interchangeable across the whole Epson range.

A cartridge that works perfectly in one Expression printer may be completely unsuitable for another Expression model, never mind a WorkForce or EcoTank machine.

Epson itself provides an Ink Finder that lets customers search using either a printer model or an ink code. That is useful because it works in both directions:

• If you know your printer model, you can identify the ink family.
• If you know the ink code, you can check which printers use it.

A specialist cartridge retailer should provide the same kind of compatibility information on its product pages.

First, find the exact Epson printer model

Start with the complete model name printed on the printer.

You may find it:

• On the front of the machine.
• On the top panel.
• On a label at the rear.
• Inside the printer’s settings menu.
• In Epson software installed on your computer.

Copy the full model, including any letters or suffixes.

Those extra characters can matter. Two Epson printers with very similar names do not necessarily use the same consumables.

Then check the ink number

If your printer already contains cartridges or you still have the old packaging, look for the ink family printed on it.

Common current Epson families include numbers such as:

• 603 and 603XL
• 604 and 604XL
• 33XL
• 405 and 405XL
• 104 EcoTank bottles
• Other numbered families depending on the printer

The number is much more useful than simply knowing the cartridge says Epson.

The three Epson systems you’re most likely to encounter

Epson has a wide printer range, but for home and small-business buyers there are three names that appear particularly often: EcoTank, WorkForce and Expression.

They do not all use ink in the same way.

Epson family	Typical ink format	What to check first
EcoTank	Refillable ink tanks using bottles	The bottle series listed for your exact model
WorkForce	Many models use replaceable cartridges	The full WorkForce model and cartridge family
Expression	Many models use replaceable standard or XL cartridges	The exact Expression model and ink code

EcoTank: ink bottles rather than cartridges

EcoTank printers work differently from conventional cartridge-based inkjets.

Instead of removing a sealed cartridge when the ink runs out, you refill built-in reservoirs using bottles designed for the printer.

For example, Epson’s 104 EcoTank series uses 65 ml bottles for compatible EcoTank models.

The important distinction is simple:

A 603 or 604 cartridge is not an alternative to a 104 bottle simply because they are all Epson inks.

Likewise, an EcoTank bottle should not be treated as a replacement for a sealed cartridge.

The printer must be designed for that ink system.

WorkForce: check the full printer model

Many Epson WorkForce printers use replaceable ink cartridges and are designed with document and office printing in mind.

But WorkForce is a printer family, not a cartridge type.

Different WorkForce models use different ink families, so searching for “Epson WorkForce ink” is too broad to guarantee the right result.

Use the complete model instead.

Once you have found it, check whether Epson specifies:

• A standard cartridge.
• An XL or higher-capacity version.
• Individual colour cartridges.
• A multipack containing several colours.

For a regularly used office printer, the higher-capacity option can be attractive because it reduces the number of cartridge changes and may lower the cost per page.

Compatibility still comes first, though. Never assume a cartridge fits simply because it belongs to another WorkForce printer with a similar model number.

Expression: one name, several ink families

The Epson Expression range includes a wide variety of home and photo-oriented printers.

That is precisely why buying by the word Expression alone is risky.

Depending on the exact model, you may encounter cartridge families such as 603, 604 or other Epson ink ranges.

Some models support both standard and XL versions.

For example, Epson currently lists both 603 and 603XL cartridges for compatible Expression Home models such as the XP-2155.

603 vs 604: are Epson cartridge numbers interchangeable?

No.

A 603 cartridge and a 604 cartridge are different product families.

The fact that the numbers are close does not mean one can substitute for the other.

This is one of the easiest mistakes to make when ordering printer ink, particularly when similar boxes appear alongside each other in search results.

If your printer is listed for 603 ink, buy a compatible 603-series product designed for that machine. If it is listed for 604, choose the appropriate 604-series product.

Do not move to the neighbouring number because the cartridge looks similar or happens to be cheaper.

What does XL mean on Epson cartridges?

An XL cartridge is a higher-capacity version intended to provide more printed pages than the standard cartridge in the same supported family.

For example, Epson currently offers both standard 603 and 603XL products.

The choice is normally between:

Do not assume an XL cartridge fits purely because its base number looks familiar. Confirm that the XL version is explicitly listed for your printer model.

Are Epson multipacks worth considering?

A multipack groups several cartridges together, usually for printers that use individual colour tanks.

Depending on the product, that may include:

• Black, cyan, magenta and yellow.
• A three-colour set without black.
• Several cartridges from the same compatible family.

A multipack can be convenient when several colours are running low or you prefer to keep replacements ready.

But the same compatibility rule applies: the pack must be designed for the exact printer.

Compare the pack price with the individual cartridge prices and think about the colours you actually use rather than assuming the biggest pack is automatically the best value.

Genuine Epson ink vs compatible Epson cartridges

Original Epson cartridges and ink bottles are developed by Epson for Epson printers.

Compatible cartridges are manufactured by third parties as alternatives for specific Epson ink codes and printer models.

The main attraction of a compatible cartridge is usually the lower purchase price.

The important question is not whether a compatible cartridge is literally identical to the original. It is whether:

• It is designed for your exact printer.
• The retailer provides clear compatibility information.
• The product is backed by a meaningful warranty.
• Support is available if the printer does not recognise it.

For everyday documents and general home or office printing, good-quality compatibles can be a practical way to reduce printing costs.

Original Epson supplies may still appeal to customers who specifically prefer manufacturer-supplied consumables or have specialist printing requirements.

Compatible vs Original Ink Guide

What if an Epson printer does not recognise a compatible cartridge?

Do not immediately assume the cartridge is faulty.

Start with the basics:

Modern cartridges use electronic communication with the printer, so a recognition problem can also involve the cartridge chip or printer firmware.

If the warning remains, contact the cartridge supplier rather than repeatedly removing and reinstalling the product.

Cartridge Not Recognised Help

How to find compatible Epson ink on Printer-Cartridges.co.uk

If you know your Epson printer model, our Find My Printer tool is usually the easiest place to start.

Select Epson, choose the relevant printer range and then the exact model to view compatible products.

If you already know the cartridge number, you can search using that instead.

Find My Epson Printer

Save the printer once you have found it

Once you have identified the correct Epson printer, Printer Saver lets you store it for future orders.

That means you do not have to remember whether you use 603, 604 or another Epson ink family the next time a cartridge runs out.

Return to the saved printer and you can quickly get back to compatible supplies for that machine.

Ask Chat Assist if you are unsure

You can also ask Chat Assist using either the printer model or cartridge number.

For example:

Chat Assist can help search the catalogue and narrow down the relevant products before you order.

Five checks before ordering Epson ink

Our compatible Epson cartridge support

Compatible cartridges only represent good value when they fit and work as expected.

Our compatible cartridges are covered by a two-year cartridge warranty, with UK support available if you have a problem.

We also offer free tracked UK delivery on qualifying orders over £30.

Orders placed before our 4pm weekday cut-off are processed promptly, and a Next Day Tracked service is available for £5.49 when you need cartridges sooner.

Our WarrantyDelivery Information

Final thoughts

Epson cartridge numbers can look confusing, but choosing the right ink is straightforward once you stop shopping by brand alone.

Start with the exact printer model.

Then identify the cartridge or bottle family designed for that machine.

After compatibility is confirmed, you can decide whether standard, XL or a multipack best suits the way you print.

EcoTank users should look for the correct ink bottle rather than a conventional cartridge, while WorkForce and Expression owners should check the specific consumables listed for their model.

The Epson logo tells you who made the printer. The model number tells you which ink to buy.

Frequently asked questions

Disclaimer: Epson printer ranges, cartridge families, ink-bottle systems and compatibility can change over time and vary by individual model. Always check the compatibility information for your exact printer before ordering or installing ink. Epson and the names of Epson printer ranges are trademarks of their respective owner; Printer-Cartridges.co.uk is an independent compatible-cartridge retailer.