Fix a Printer Printing Lines or Streaks
Printer leaving lines or streaks across the page? Here are the inkjet and laser fixes, from cleaning cycles to drum checks, that clear it up.
Streaks and lines across a printed page are one of the most common printer complaints, and the cause depends entirely on whether you have an inkjet or a laser. An inkjet streaks because tiny nozzles are clogged. A laser streaks because the drum, toner, or paper path is dirty or worn. Apply the wrong fix and you waste ink, toner, and an afternoon.
Quick answer
If an inkjet prints lines or streaks, the printhead nozzles are clogged: run the built-in cleaning cycle two or three times, then clean the printhead manually with a cotton swab and isopropyl alcohol if needed. If a laser printer streaks, the cause is mechanical: inspect the drum for scratches, rock the toner cartridge to redistribute toner, and clean the paper path. On both types, rule out damp or wrong-size paper first, because no cleaning fixes a paper problem.
This guide separates the two. Work through the section that matches your printer, in order, and most streaking clears up without a service call.
Key takeaways
- Inkjet streaks are almost always clogged printhead nozzles.
- Laser streaks point to a dirty or failing drum, uneven toner, or paper-path contamination.
- Start with the printer's built-in cleaning cycle; run it more than once if needed.
- A cotton swab and isopropyl alcohol can clear stubborn inkjet printheads.
- Damp, wrong-size, or low-quality paper causes streaks on both types.
Identify your printer type
If your printer uses liquid ink cartridges, it is an inkjet and clogged nozzles are the prime suspect. If it uses toner cartridges and a drum, it is a laser and the fix is mechanical rather than nozzle-based. The symptoms can look identical on paper, so always match the fix to the hardware.
The exact pattern of the streak is a strong clue to the cause. Use this to narrow it down before you start:
| What you see | Printer type | Likely cause | First fix |
|---|---|---|---|
| Faint gaps in one color | Inkjet | Clogged nozzles in that channel | Cleaning cycle, then nozzle check |
| Horizontal banding | Inkjet | Partial clog or low ink | Cleaning cycle, replace low cartridge |
| Vertical line, same spot every page | Laser | Scratched drum | Inspect and replace drum |
| Repeating mark at a fixed interval | Laser | Worn drum or fuser | Replace drum, service fuser |
| Smears and random toner specks | Laser | Dirty paper path | Wipe path and rollers |
| Streaks regardless of cleaning | Either | Damp or wrong-size paper | Fresh, dry ream |
Fix inkjet streaks
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Run the cleaning cycle. From the printer's menu or its software on your computer, run the printhead cleaning routine. Print a test page, and run it again if lines remain. Two or three passes are normal.
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Print a nozzle check. Use the nozzle-check pattern to see exactly which color channels are missing. This tells you whether the clog is in one color or all of them.
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Clean the printhead manually. If cycles do not clear it, dampen a cotton swab or lint-free cloth with isopropyl alcohol and gently wipe the printhead nozzles. Let it dry before printing.
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Check ink levels. Replace any cartridge that is low or empty. A nearly dry cartridge produces faint, streaky output that looks like a clog.
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Reseat the cartridges. Remove and firmly reinsert each cartridge to ensure good electrical contact and clear an airlock.
Fix laser streaks
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Inspect the drum. Open the printer and check the imaging drum for scratches, marks, or debris. A scratched or worn drum prints repeating lines and usually needs replacing.
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Reseat and shake the toner. Remove the toner cartridge and gently rock it side to side to redistribute toner, which fixes streaks from uneven distribution, then reinsert it.
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Clean the paper path. Wipe out dust and stray toner from the paper path and rollers with a dry, lint-free cloth. Contamination here leaves smears and lines.
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Check the fuser. A worn fuser can leave repeating marks. If lines repeat at a fixed interval down the page, the drum or fuser is the likely cause and may need service.
Note
On both printer types, rule out the paper first. Damp, curled, dusty, or wrong-size paper produces streaks that no cleaning will fix. Open a fresh ream, store it dry, and try again before tearing into the hardware.
Why inkjets clog and how to prevent it
If you keep fighting clogs, the root cause is usually how the printer sits idle. Inkjet ink is water-based, and when a printer goes unused for weeks, ink dries in the microscopic nozzles and forms a plug. The fix that actually prevents recurring streaks is not more cleaning cycles, it is using the printer.
- Print something every week or two, even a single color test page, to keep ink moving through the nozzles.
- Power the printer off with its own button, not a switched power strip, so it can cap and park the printhead.
- Store it somewhere with stable temperature and humidity, since heat and dry air speed up drying.
- Use the right ink: cheap third-party ink and refills can have different drying characteristics that clog more.
- Run a single deep clean rather than five light ones; light cycles repeated back to back mostly waste ink.
Laser printers do not clog this way because toner is a dry powder, which is why a laser is the better choice for someone who prints rarely. If you only print a few pages a month, a cheap mono laser will frustrate you far less than an inkjet that clogs between jobs.
When cleaning is not enough
If you have run cleaning cycles, swapped ink or toner, and tried fresh paper but the streaks remain, the printhead, drum, or fuser may be at the end of its life. At that point do the math: a replacement drum or printhead can cost a meaningful fraction of a new printer, so on a cheap consumer unit, replacing the whole printer is often the smarter call. On a business laser, individual parts are usually worth it. If your printer also keeps dropping off the network or shows as unavailable, that is a separate issue covered in our printer offline in Windows 11 fix and the print spooler keeps stopping fix. If a paper jam keeps appearing even when there is no jam, see our Canon paper jam error fix.
What to do right now
Run this in order and stop as soon as the streaks clear.
- Rule out paper first: load a fresh, dry ream of the correct size before touching the hardware.
- Inkjet: run the cleaning cycle, print a nozzle check, and repeat two or three times.
- Inkjet, still streaking: wipe the printhead with isopropyl alcohol on a swab, let it dry, retry.
- Laser: open it up, inspect the drum for scratches, and rock the toner cartridge to even out toner.
- Laser, still streaking: wipe the paper path and rollers with a dry lint-free cloth.
- Match repeating marks to the interval: a fixed-distance repeat points to the drum or fuser, which may need replacing.
- Replace consumables that are low, since a nearly empty cartridge fakes a clog.
Frequently asked questions
Why does my inkjet print lines even with full cartridges?
The printhead nozzles are clogged. Run the cleaning cycle two or three times, then clean the printhead manually with isopropyl alcohol if the lines persist.
What causes repeating lines on a laser printer?
Repeating marks at a fixed interval usually mean a scratched drum or a worn fuser. Inspect the drum for damage and replace it if you see scratches.
Can bad paper really cause streaks?
Yes. Damp, dusty, curled, or wrong-size paper streaks on both inkjet and laser printers. Always try a fresh ream stored in a dry place before assuming a hardware fault.
How often should I run a printhead cleaning cycle?
Only when you see quality problems. Each cleaning uses ink, so running it constantly wastes a cartridge. Print regularly instead, since idle inkjets clog faster.
