Your printer says "offline" but it is plainly switched on

The printer is on, its little screen is lit, the status light is green, and the computer still says “offline” and refuses to print anything. In the large majority of cases the printer itself is perfectly fine. What has broken is the link between it and the computer.

In the vocabulary of Windows and macOS, “offline” does not mean “switched off”. It means: “I tried to speak to this printer, I got no answer, so I have stopped trying.” And the message has a bad habit of staying on screen long after the problem has resolved itself, until something forces the computer to check again.

USB or Wi-Fi: the distinction that decides everything

Before hunting for anything, answer one question: how is the printer connected?

By a USB cable. A wire runs from the printer into the computer. This arrangement rarely breaks, and when it does the cause is almost always physical: a cable half out of its socket, a port that no longer supplies power, a tired USB hub, or a computer that has been moved.

Over Wi-Fi, or by a network cable. The printer has its own address on your home network and the computer reaches it the way it reaches a website. This arrangement produces nearly every “offline” message in the world, because it depends on the network, and a network changes more often than people think.

If you are not sure which you have, look at the back of the printer. A single cable, the power one, means Wi-Fi.

The number one cause: the network changed

A Wi-Fi printer memorises your network name and password once and never asks again. The day either of them changes, it keeps looking for a network that no longer exists, and nobody tells it.

What knocks it off, in order of how often it happens:

A new router. A change of provider, a replacement for a failing box, a move to a mesh system. The new network has a different name, or the same name with a different password. Every phone in the house was reconnected on the first evening; the printer, down in the basement, was forgotten.

A changed password. Often after a visit or a security scare. Same effect.

A move to 5 GHz. Plenty of printers, including recent ones, only understand the 2.4 GHz band. If your router was reconfigured to split the bands, or the printer now sits closest to a unit that pushes it toward 5 GHz, it simply will not see the network.

An address that shifted. The router hands out addresses automatically and rotates them. The computer memorised the printer at one address; the printer picked up a different one after a power cut. Both are on the network and neither can find the other.

That last one is the sneakiest, because everything looks normal from both ends.

The queue that jams behind one failed job

The second big family of causes, and the most frustrating, because no hardware is involved at all.

Every document you send enters a print queue. If one job is stuck in there — something sent during a paper jam, a file too heavy to process, a document sent while the printer was asleep — everything behind it piles up and never comes out. Some systems then pause the printer automatically and show it as unavailable.

The classic symptom: you print three times, nothing appears, you give up. Then, two days later, the printer suddenly produces all four copies when something clears the jam.

The fix is to empty the queue completely and restart the print service. On Windows you open the queue, cancel every document, and if one refuses to disappear, restart the computer, which settles it in almost every household case.

Drivers, after an operating system update

A driver is the small piece of software that translates what you want to print into the language of your exact model. A major Windows or macOS update can disable it, swap it for a generic version, or leave it incompatible.

Two clues point at this. First, the problem appeared the day after an update, with nothing else having changed. Second, the printer still works from a phone or a tablet but not from the computer, which proves the machine and the network are fine.

Older printers are hit first, because the manufacturer stopped publishing new drivers. A generic driver often works around it, at the cost of some features, but this is also the point at which the replacement question deserves an honest answer.

The order to try fixes in

Do not try everything at once. Following this order, most people are printing again before step 5.

1. Look at the printer itself. Paper, ink, an error message on its own screen, a lid not fully closed. A printer in a physical error state reports itself offline.
2. Turn it fully off with its own button, then unplug it from the wall for thirty seconds. Plug it back in and let it finish starting up. That full restart, as opposed to waking it from sleep, fixes a large share of cases.
3. Empty the print queue and cancel every document sitting in it.
4. Restart the computer. Inelegant, highly effective: it restarts the print service and forces a fresh search for the printer.
5. Check the printer’s Wi-Fi. Most models can print a network configuration page from their own menu. If the network name is wrong, or there is no address at all, you have found your cause: it needs reconnecting to the network.
6. Remove the printer and add it again in the computer’s settings. This rebuilds the link using the correct current address.
7. Reinstall the driver from the manufacturer’s site, choosing your exact model and your system version.

If step 5 shows the printer has no network and you cannot get it back on, the problem lives in the Wi-Fi rather than in the printer. Our piece on Wi-Fi dead zones explains why a device in the basement can see the network one day and not the next.

The printer that sleeps too well

Some printers save so much power that they drop off the Wi-Fi in deep sleep and take too long to come back. The computer concludes there is nothing there and shows “offline”.

If your printer always works on the second attempt but never on the first, this is very likely it. In its settings, lengthen the delay before sleep, or turn off the most aggressive power-saving mode. On Wi-Fi models, giving it a fixed address in the router also removes much of the problem.

Printing from a phone or tablet

This is an excellent diagnostic tool. If printing works from an iPhone or an Android but fails from the computer, the printer, the network and the cartridges are all cleared. The problem is entirely in how the computer is set up.

The reverse holds too: if nothing prints from any device, look at the printer or its connection to the network.

What stops it happening again

Give the printer a fixed address. It is done in the router, takes a few minutes, and eliminates the sneakiest cause on the list.

Write the Wi-Fi password somewhere reliable. The day you have to reconnect the printer, that is the thing you will spend an hour looking for.

Print one page a month. It keeps the heads clear on inkjet models, and it warns you about a problem before the evening you need a document at eleven o’clock.

Keep the USB cable that came in the box. It gets a document printed when the network is misbehaving.

When replacing costs less than repairing

It is worth saying plainly: a household printer is not an object you get repaired.

Replacement is the right call when the manufacturer no longer publishes drivers for your system, when cartridges are getting hard to find, when the paper feed mechanism jams repeatedly, or when a full set of cartridges costs nearly as much as a new printer. A shop repair on a consumer model almost always exceeds what the machine is worth.

Replacement is the wrong call when the only thing blocking you is a network or driver problem, which is most of the time. Nothing is more discouraging than buying a new printer, connecting it to the same badly configured network, and meeting exactly the same message two weeks later.

If that is where you are and you would rather have someone untangle it, that is what our printers and home office service covers. When the cause turns out to be the network it belongs to Wi-Fi and home networking instead, and a good share of the work can be done remotely, with no visit.