Learn what causes vertical and horizontal lines on your pages and follow our step-by-step troubleshooting guide to clean print heads and realign your cartridges, drum and alignment issues.
Printer Printing Lines Quick Fix Checklist
Try these steps before replacing parts:
- Check the original document for lines
- Check ink or toner levels
- Run nozzle cleaning
- Run printhead alignment
- Clean rollers and scanner glass
- Remove and gently shake toner cartridge
- Print a test page
Common Causes of Vertical and Horizontal Printer Lines
| Line Direction | Primary Causes | Common Fix |
| Horizontal | Clogged nozzles, Misaligned printhead, Low ink | Run a Printhead Cleaning cycle or check ink levels. |
| Vertical | Drum or toner issues, Dirty components, Roller problems | Wipe the internal rollers or check the toner/drum for damage. |
| Faded/Streaky | Dried ink, Clogged nozzles, Empty cartridge | Replace the cartridge or clean the nozzle with a lint-free cloth. |
Related Read: Why Does My Printer Print Random Weird Symbols and Characters?
Check the Original Document and Resolution
Your printer replicates every detail you see on your computer screen to the best of its abilities. That includes words, images, patterns and anything else in your document. So when lines appear in your printout, start by ruling out the original file and settings as the cause.
Lines or streaks can result from defects already present in the original document, over-stretched images, or a printer resolution set too low.
To fix it, verify the original file is free of streaks, ensure images aren’t excessively stretched, and confirm your printer resolution is set to a moderate or high level. There are plenty of settings that you can adjust to that will either improve or reduce the quality of your printer’s output. Do not use draft mode for high quality printing needs.
Check Ink and Toner Levels
Your printer’s ink or toner is the most crucial consumable needed for the device to function correctly. Ink is typically in one or more black ink cartridges. Color cartridges are cyan, magenta, and yellow ink. Specialty printers may have more colors.
Printing streaks, vertical or horizontal, can also occur when your printer’s ink reaches low levels. When that happens, the cartridges fail to distribute the ink evenly, causing the appearance of unwanted lines throughout the printout. Use good quality ink cartridges designed for your printer and replace them as needed.
How to Fix Horizontal Printer Lines (Inkjet Issues)
Inkjet printers spray tiny droplets of ink onto the paper. Lines usually occur when the ink flow is interrupted. Common causes include:
- Clogged printhead nozzles
- Misaligned printhead
- Low or drying ink cartridges
- Dirty printhead
These problems usually produce horizontal lines or banding, especially in photos or graphics.
Cleaning and Unclogging the Printhead
What it is: The printhead is a component that houses ink cartridges securely. It also moves your cartridges from side to side so they can release ink onto the paper sheet that passes underneath. The ink from the cartridges will have to pass through the printhead onto the paper below.
The printhead can become dirty after extended use, and also if you haven’t used the printer for a while. Any leftover ink on the printhead will dry and harden slightly when left unused.
As a result, the dirty printhead affects how ink travels from the cartridge to the paper underneath. The end result will be lines that run vertically or even horizontally, depending on how dirty the printhead is.
How to fix it: You can solve this problem by cleaning the print head. Most printers have an automatic function that will clean the print heads for you.
To clean a stubborn print head manually, begin by removing the printhead. Then, briefly soak the dirty part in a mixture of 50% water and 50% isopropyl alcohol. The mixture will clean dried ink and anything else dirtying the printhead. Last, air dry the printhead on a kitchen towel to remove any excess moisture before reinstalling it in your printer.
Clogged Printhead Nozzles
Tiny nozzles spray ink onto paper. When dried ink or dust blocks them, the printer leaves white gaps or horizontal streaks. Fix:
- Run nozzle check
- Run head cleaning cycle
- Print several pages afterward
Read: Why How to Connect Printer to Starlink Wifi
Aligning the Printhead for Better Precision
If the printhead is slightly misaligned, ink droplets do not land exactly where they should. This often causes faint horizontal banding across photos or graphics. Most printers include a printhead alignment utility in their maintenance menu.
Fix: Run the printer’s printhead alignment tool in the settings menu.
How to Fix Vertical Printer Lines (Laser & Hardware Issues)
Laser printers use toner powder and a rotating drum to transfer the image onto the page. Lines in laser printers are often caused by:
- Worn drum units
- Dirty corona wire
- Uneven toner distribution
- Damaged fuser rollers
These issues typically create vertical streaks that repeat down the page.
Redistributing and Replacing Toner
What it is: Some printers use toner instead of ink. Unlike liquid ink, toner is a dry powdery mixture that rests in a drum unit until needed. When you print a document, the printer will use heat and electrostatic energy to deposit the toner onto paper and produce the printout you want.
Why it happens: As you saw earlier, toner differs from ink because it’s a dry powder. So, while liquid ink will distribute itself evenly within a cartridge, toner can be distributed unevenly.
In other words, the toner cartridge might have too much powder on one side compared to the other. That poorly distributed toner will cause quality problems with your printouts, including unwanted vertical and horizontal streaks.
The toner likely became unevenly distributed because the cartridge was left resting on one side during storage. Similarly, the same would happen if the printer as a whole was turned on its side and left that way for an extended period during maintenance.
How to fix it: Firstly, remove the printer and take it to a well-ventilated space. Then, shake the toner cartridge for a few moments. You’re doing that to redistribute the toner powder within the cartridge.
If that doesn’t work, the second solution is to replace the cartridge with a new one. Again, be sure to choose a genuine cartridge compatible with your printer to reduce the odds of a fault or problem with the unit.
Read: Why Does My Printer Make Grinding Noises?
Cleaning the Drum Unit and Internal Rollers
Laser printers rely on a drum unit to transfer toner to paper. If the drum becomes scratched or dirty, it can create repeating vertical lines on every page. Fix:
- Clean the drum
- Replace the drum unit if damaged
Paper rollers collect dust and toner particles over time. Dirty rollers can cause uneven paper feeding, which creates streaks or lines during printing. Fix : Clean rollers with a lint-free cloth.
Related Read: Why Does My Printer Only Print Half the Page?
Paper Quality and Environment Factors
Cheap or thin paper often has uneven texture or inconsistent thickness. When inkjet printers apply ink to this type of surface, the ink may absorb unevenly, causing horizontal banding or streaks.
Laser printers can also struggle with low-quality paper because toner may not bond evenly to the surface. If paper has accumulated dust, fibers, or debris, those particles can interfere with the printing process and create streaks or lines across the page. Fix:
- Use paper designed specifically for your printer type (inkjet or laser)
- Choose paper with a weight of 20 lb (75–90 gsm) or higher
- Avoid extremely thin or bargain paper
Damp or Humid Paper
Paper easily absorbs moisture from the air. If the paper becomes slightly damp, it may not feed smoothly through the printer and can cause toner streaks, smearing, or faint lines. Damp paper can prevent toner from bonding evenly to the page, producing streaks or banding.
High humidity can also affect how ink dries on the page.
Fix
- Store paper in a dry, sealed package
- Avoid keeping paper near kitchens, bathrooms, or windows
- If paper feels slightly curled or wavy, replace it with fresh paper
Incorrect Paper Settings
Many printers allow you to choose the paper type in the print settings (plain, photo, cardstock, etc.). If the wrong setting is selected, the printer may apply too much or too little ink or toner, leading to streaking or banding. Fix: Check that the selected paper type in the printer settings matches the paper loaded in the tray.
Run a Printer Nozzle Check or Test Page
Most printers include a built-in diagnostic tool that prints a test page or nozzle check pattern. This pattern helps determine whether the problem is caused by the printer hardware or by the document you are printing.
A nozzle check prints small grids or lines for each ink color. If some lines are missing or broken, the printhead nozzles are likely clogged.
How to run a nozzle check
- Open the printer’s maintenance or tools menu
- Select Nozzle Check or Print Test Page
- Examine the printed pattern
What the results mean
| Test Result | Likely Problem |
|---|---|
| Missing horizontal lines | Clogged printhead |
| Vertical streaks repeating down the page | Drum or toner problem |
| Lines only on certain colors | One cartridge is failing |
If the pattern shows gaps or streaks, run the printer’s head cleaning cycle and print another test page.
Frequently Asked Questions (FAQs)
Why does my printer print lines only on photos?
Lines appearing only on photos are often caused by clogged printhead nozzles or incorrect photo paper settings. Running a nozzle cleaning cycle and selecting the correct paper type usually fixes the problem.
Why Does My Printer Print Lines After Replacing Ink?
After installing a new cartridge, air bubbles or misalignment can cause temporary streaks. Running a printhead alignment or cleaning cycle normally resolves the issue.
How Do You Troubleshoot A Printer Problem?
You can troubleshoot a printer problem by running its troubleshooting feature. Manufacturers typically include this feature with their printer management application. When you use it, the printer will diagnose itself for issues and let you know what’s wrong.
How Do You Clean A Dirty Printer?
A simple brush is enough to remove a lot of debris from a dirty printer. You can also use a vacuum but keep it at its lowest power setting. When it comes to electrical contacts, clean those using isopropyl alcohol (often called rubbing alcohol), which is safe for electronics.
How Often Should A Printer Be Cleaned?
You should clean a printer at least once every 6 months. However, you should clean the device more often if you use it heavily. For example, an office printer used often every day should be cleaned once every 2 months.
Is Toner The Same As Ink?
No, toner and ink are not the same. Printer toner consists of a dry powder, while printer ink is liquid. Printers that use toners are often found in office environments that print high quantities of black and white documents.
Why Do Printer Lines Repeat In The Same Spot?
If a line appears in the exact same position on every page, the problem is usually a damaged drum or roller inside the printer. Possibly a damaged printhead.
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