What Ink Does the HP OfficeJet 4635 Use?

Quick answer: The HP OfficeJet 4635 uses HP 61 ink: one black and one tri-color cartridge. The high-yield HP 61XL Black and HP 61XL Tri-Color print about 480 and 330 pages, roughly two to three times as many as standard HP 61.

HP OfficeJet 4635 Ink Cartridges at a Glance

The OfficeJet 4635 is part of HP's OfficeJet 4630 series. The same HP 61 / 61XL cartridges also fit the OfficeJet 4630 and 4632, the Envy 4500 and 5530, and DeskJet 1000, 1010, 2540 and 3050 models.

The OfficeJet 4635 is a compact wireless all-in-one with print, scan, copy and fax and a 35-page document feeder, aimed at home offices. Like other HP 61 printers, its printheads are built into the cartridges.

Do not confuse HP 61 with HP 62, HP 63 or HP 65. They look alike, but only HP 61 fits the OfficeJet 4635.

Save on HP 61 / 61XL

Castle Ink carries the remanufactured HP 61XL Black (CH563WN), HP 61XL Tri-Color (CH564WN) and a HP 61XL black and color combo pack. Every cartridge is tested, backed by a 1-year guarantee, ships the same day when you order by 4 PM ET, and ships free on orders over $50.

Want to compare the real cost per page? Try our printer ink cost calculator.

How to Replace the Ink in the HP OfficeJet 4635

1. Turn the printer on and open the ink cartridge access door. Wait for the carriage to move to the center and stop.
2. Press down lightly on the cartridge you are replacing to release it, then pull it up and out. The tri-color cartridge sits on the left, black on the right.
3. Unwrap the new cartridge and pull off the plastic tape by its pink or orange tab. Do not touch the copper contacts or the ink nozzles.
4. Slide the cartridge into its slot at a slight upward angle, contacts facing the printer, and push until it clicks into place.
5. Close the access door. If the printer prints an alignment page, follow the prompts on the control panel or in HP Smart.

Troubleshooting Tips

"Cartridge problem" or "incompatible cartridge": Remove the cartridge, wipe the copper contacts with a dry lint-free cloth, check that all the tape is off, and reseat it until it clicks. If the message stays, our HP cartridge not recognized guide walks through every HP message in order.

Streaks or missing colors: Run the printhead cleaning from the printer's Tools menu or the HP Smart app. Two cycles usually clear a clog; if not, the cartridge itself is the likely culprit, because the printhead is built into it.

Low-ink warning on a new cartridge: Remanufactured cartridges reuse original HP chips, so the ink gauge can read low or show "?" while the cartridge is full. Judge by print quality, not the gauge.

Official HP Resources

• HP Customer Support — printers
• HP ink, toner and paper finder

Bottom Line

The HP OfficeJet 4635 uses HP 61 cartridges, and the HP 61XL pair is the better value for anyone who prints more than a few pages a week.

Written and reviewed by William Elward — Founder of Castle Ink, 20+ years in the printer & imaging supplies industry. Updated October 2026.

Frequently Asked Questions

Does the HP OfficeJet 4635 take HP 61 or HP 61XL?
Both fit the same slots. The XL cartridges simply hold more ink.

Is HP 61 discontinued?
HP has been winding down HP 61, but remanufactured HP 61XL cartridges remain widely available. See HP 61 vs HP 61XL.

Can I print with only the black cartridge?
No. HP 61 printers need both cartridges installed, even if you only print in black.

Does using remanufactured ink void my warranty?
No. The U.S. Magnuson-Moss Warranty Act stops HP from voiding your warranty just because you used third-party cartridges.

Shop Ink at Castle Ink

Find the right cartridge for the HP OfficeJet 4635 and every other printer we cover on the Find Ink by Printer page, browse all HP ink cartridges, or work through a fault at our printer troubleshooting center.

Looking for a new printer? HP OfficeJet printers on Amazon — as an Amazon Associate we earn from qualifying purchases.

See also: HP 61 vs HP 61XL | HP printer not recognizing ink cartridge | how to change the ink in an HP printer