Find your printer model and cartridge type first

Before you buy a replacement cartridge, you need to know exactly which one fits your printer. The model number is usually on the front or back of the machine — look for something like "HP OfficeJet 4255" or "Canon PIXMA TR4720". Write it down or take a photo.

Next, open the printer's access panel or lid. Most printers have a door on top or front that swings open to reveal the cartridge slots. Inside, you will see the cartridges themselves, usually labeled with their color: black, cyan, magenta, and yellow. Each slot is marked with the cartridge type it needs — something like "XL" or "XXL" for high-capacity versions, or standard size. Take a photo of what you see, or write down the exact cartridge numbers printed on the cartridges currently in the machine.

You can also find this information in your printer's manual, which is often available as a PDF on the manufacturer's website if you no longer have the physical copy. Search "[your printer model] manual" and look for the specifications or parts section.

Key Takeaways

  • Your printer model number and the cartridge type numbers are printed on the machine itself — take a photo before you shop to avoid buying the wrong cartridge.
  • Genuine cartridges from the printer manufacturer cost more but are designed for your specific machine and usually come with a warranty.
  • Third-party and remanufactured cartridges cost less but may not work reliably, and using them sometimes voids your printer's warranty.
  • The replacement process takes about five minutes: turn off the printer, open the access panel, remove the old cartridge, and snap the new one in until it clicks.
  • If your printer shows a low-ink warning but the cartridge still works, you can usually ignore it and keep printing until the cartridge actually runs dry.

Decide between genuine and third-party cartridges

Genuine cartridges are made by the printer manufacturer — HP, Canon, Epson, Brother, and so on. They cost more, sometimes significantly more, but they are designed specifically for your machine. They usually come with a warranty, and the manufacturer guarantees they will work. If a genuine cartridge fails, you have a clear path to a replacement.

Third-party cartridges are made by other companies and cost less — sometimes half the price of genuine ones. They include remanufactured cartridges (used cartridges that have been refilled and resold) and compatible cartridges (new cartridges made to fit your printer but not by the manufacturer). They often work fine, but quality varies widely. Some printers will refuse to recognize them or will display error messages. Some leak or produce poor print quality. If one fails, you have no warranty and no recourse.

Check your printer's warranty before you buy third-party cartridges. Many manufacturers state that using non-genuine supplies voids the warranty on the entire printer. If your printer is still under warranty and you want to keep it that way, stick with genuine cartridges. If your warranty has expired or you are willing to accept the risk, third-party cartridges can save money over time.

Where to buy cartridges and what to expect on price

Genuine cartridges are sold at office supply stores (Staples, Office Depot), big-box retailers (Walmart, Target, Best Buy), online marketplaces (Amazon, eBay), and directly from the manufacturer's website. Prices vary by retailer and by whether the cartridge is standard or high-capacity. A single genuine black cartridge might cost $15 to $30; a color cartridge might cost $20 to $40. High-capacity versions cost more but yield more pages.

Third-party cartridges are usually found on Amazon, eBay, and specialty retailers. They typically cost 40 to 60 percent less than genuine cartridges. Before you buy, read the reviews carefully — look for comments about whether the cartridge was recognized by the printer and whether the print quality was acceptable. Avoid sellers with many complaints about leaking or non-recognition.

Some retailers offer cartridge subscription services where they send you replacements automatically when your printer runs low. These can be convenient, but they lock you into one brand and one retailer. You lose the ability to shop around or switch to a cheaper option if your needs change.

The step-by-step replacement process

Step 1: Turn off the printer and let it cool for a minute. This prevents accidental damage to the print head and gives the cartridge carriage time to move to the home position (the resting spot where cartridges are easiest to access).

Step 2: Open the access panel. This is usually the top lid or a front door. Push or pull gently until it swings open. Some printers have a secondary cover over the cartridges themselves — open that too if it exists.

Step 3: Locate the cartridge you need to replace. Cartridges are usually arranged left to right as black, cyan, magenta, yellow — but check your printer's manual if you are unsure. The cartridge you want to replace will be in one of these slots.

Step 4: Remove the old cartridge. Most cartridges have a small tab or lever on the side. Press or pull it toward the center of the printer. The cartridge will pop up slightly. Grab it and pull it straight out toward you. Do not tilt it or force it — it should slide out smoothly.

Step 5: Unpack the new cartridge and remove the protective tape. New cartridges come with a plastic cover or tape on the bottom that protects the nozzles during shipping. Peel this off completely before you insert the cartridge. If you leave it on, the cartridge will not work and may damage the printer.

Step 6: Insert the new cartridge. Line it up with the empty slot and push it straight in until you hear or feel a click. The cartridge should sit flush with the printer body. If it does not click or feels loose, remove it and try again — it may not be fully seated.

Step 7: Close the access panel and turn the printer back on. The printer will run a brief initialization cycle. This is normal. Once it finishes, the printer is ready to use.

What to do if the printer does not recognize the new cartridge

If your printer displays an error message or says the cartridge is not recognized, the first step is to turn off the printer, wait 30 seconds, and turn it back on. Sometimes the printer needs to restart to detect a new cartridge.

If that does not work, remove the cartridge and check that you removed all the protective tape and plastic. Even a small piece left behind can prevent recognition. Also check that the cartridge is the correct type for your printer — if you bought the wrong model by mistake, no amount of reinserting will make it work.

If you are using a third-party cartridge, the printer may straightforward refuse to recognize it. This is a design choice by the manufacturer to push users toward genuine cartridges. Some third-party cartridges have a workaround (a chip or reset procedure), but not all. Check the cartridge packaging or the seller's listing for instructions. If none exist and the cartridge still will not work after reinsertion, you may need to return it and buy a different brand or switch to a genuine cartridge.

Managing low-ink warnings and when to actually replace a cartridge

Most printers display a low-ink warning when a cartridge reaches about 20 percent capacity. This warning is a sales tool — it encourages you to buy a replacement before you actually need one. You can usually ignore it and keep printing. The cartridge will continue to work until it is truly empty, which may be weeks or months away depending on how much you print.

The exception is if you are printing something important and color accuracy matters — a photo, a document for a job interview, or artwork. In that case, replace the cartridge when you see the warning, because old cartridges can produce faded or inconsistent color.

Some printers will stop printing entirely once a cartridge is completely empty, even if the other cartridges still have ink. This is another manufacturer design choice. If this happens to you, you have no choice but to replace the empty cartridge to resume printing, even if you only need one color.

Storing extra cartridges and avoiding waste

If you buy cartridges in bulk or stock up during a sale, store them in a cool, dry place away from direct sunlight. Unopened cartridges can last for years if stored properly. Once you open a cartridge, use it within a few months — the ink can dry out if it sits unused for too long.

Do not store cartridges in the refrigerator or freezer, even though some people recommend it. Temperature changes can cause condensation inside the cartridge, which damages the ink and the electronics. Room temperature is fine.

If you have old cartridges you no longer need, do not throw them in the trash. Many office supply stores (Staples, Office Depot) accept used cartridges for recycling at no charge. Some manufacturers also have mail-back programs. Cartridges contain plastic, metal, and sometimes hazardous materials, so recycling is better for the environment than landfill disposal.

Frequently Asked Questions

Can I refill a cartridge instead of replacing it?

Yes, refill kits exist and cost much less than new cartridges — usually $10 to $20 for a set of colors. You drill a small hole in the cartridge, inject ink, and seal it back up. The process is messy and requires care not to spill ink on your printer or hands. Quality varies widely, and some refilled cartridges leak or produce poor results. If you are comfortable with the risk and the mess, refill kits can save money over time.

What happens if I use the wrong cartridge type?

If you insert a cartridge designed for a different printer model, it usually will not fit into the slot — the physical shape is different. If it somehow does fit, the printer will not recognize it and will display an error. You cannot damage the printer by trying the wrong cartridge, but you will waste money on a cartridge you cannot use. Always double-check the model number before you buy.

Do I need to clean the print head when I replace a cartridge?

No, not usually. The print head cleans itself automatically when you turn the printer on and off. If you notice poor print quality after replacing a cartridge, run the printer's built-in cleaning cycle first — this is usually found in the printer settings or maintenance menu on your computer. If cleaning does not help, the print head may need professional service, but this is rare.

Can I use a cartridge from a different brand in my printer?

No. Cartridges are designed to fit specific printer models and brands. An HP cartridge will not fit in a Canon printer, and vice versa. Even within the same brand, cartridges for different models are often incompatible. Always buy a cartridge that matches your exact printer model.

Is it cheaper to buy individual cartridges or a multipack?

Multipacks usually offer a lower per-cartridge price, but only if you actually use all the colors regularly. If you print mostly in black and white, buying individual black cartridges as you need them is cheaper than buying a multipack with colors you will not use for months. Calculate based on your actual printing habits, not the advertised savings.