How to check printer alignment using fine lines

Are fine lines on your printout doubled, slanted, or broken? A page with thin lines and small text can help you tell whether the issue is printer alignment, paper feeding, or a printhead or toner problem.

Use the Printer Test Page to print lines, text, color blocks, and gray steps. Check the result in good light, then try the fixes that match what you see.

Print and inspect the fine lines

Open the Printer Test Page and print its test page using your browser's print command. Load plain paper that matches the size selected in the print dialog.
In the print dialog, select the correct printer and paper size. Choose 100% or actual size if available, rather than an option that fits or shrinks the page.
Let the page finish, then lay it flat under bright light. Look at thin horizontal and vertical lines, the edges of small text, and the color blocks.
Check whether defects repeat in the same direction across the page. Compare the top and bottom, and the left and right sides, instead of judging one mark in isolation.
If you change a setting or run printer maintenance, print another copy of the same test page. Comparing before and after makes it easier to see whether the change helped.

What the result means

Lines are straight, continuous, and single

The printer's basic alignment looks reasonable. If a particular document still has shifted lines, check that file's layout, print scaling, and application settings. A browser test page cannot prove that every application sends pages to the printer in the same way.

Lines or letters have doubled edges

Repeated edges can point to printhead alignment on an inkjet printer or color registration on a color laser printer. Registration means lining up the separate color layers so they form one image. Run the printer's alignment or registration procedure, then inspect a new test page.

The lines tilt across the sheet

If the whole printed image looks rotated, the paper may have entered crooked. This is different from printhead alignment: the printer can make straight lines on the page, but the lines are at an angle to the paper edges. Check the paper guides and how the sheet sits in the tray.

Lines have gaps or broken sections

Missing parts of a line are more likely to come from a blocked ink nozzle, low or uneven ink, a toner issue, or a worn part than from alignment alone. Run a nozzle or print quality check from the printer's maintenance utility. If the same gaps remain, check the ink or toner and follow the printer's instructions.

Color edges appear separated

A colored fringe around a line or text can indicate that the color layers are not registered together. If black lines look clean but color edges are displaced, use the printer's color alignment or registration maintenance option rather than repeatedly cleaning the printhead.

How to fix printer alignment

Reseat the paper. Remove the stack, fan it gently, and load a few flat sheets. Move the paper guides until they touch the edges without bending them. If the page still prints at an angle, test one sheet from another tray if your printer has one.
Check the print size and paper type. In Windows 11, open Settings › Bluetooth & devices › Printers & scanners, select your printer, and open Printing preferences. Choose the paper size and type that match the loaded sheet. On macOS, open System Settings › Printers & Scanners, select the printer, and check its print options and paper size in the print dialog.
Run the alignment routine. Open the printer's own maintenance utility or control panel and look for a printhead alignment, automatic alignment, or color registration option. The exact name and steps depend on the model. Some printers print a pattern that you scan or use to select the best-aligned sample.
Clean the printhead only if lines are missing. For an inkjet printer, use its nozzle check and cleaning routine if the test has gaps or broken strokes. A cleaning cycle uses ink, so follow the printer's instructions and avoid running it repeatedly without checking the next print.
Check the cartridges or toner. Make sure cartridges are seated correctly and that protective tape was removed from any new cartridge. If the printer has a color registration procedure, run it after replacing toner or moving the printer.
Update or reinstall the printer driver. If the printer's own test page is clean but jobs from the computer are not, restart the printer and computer, then check for the correct printer software and driver for your model. A generic driver can omit maintenance or print-quality controls.

When it's a printer hardware problem

If the printer's built-in alignment routine cannot complete, or the same doubled lines remain after alignment and fresh paper, the printhead, carriage, encoder strip, or another internal part may need attention. On a laser printer, persistent color shifts after registration can also point to a component that needs service. Do not reach into a hot printer or touch internal parts unless the manufacturer's instructions say it is safe.

Print the same test from another computer if possible. If the defect appears there too, it is probably in the printer or its supplies, not the original computer's settings. Check the warranty or ask a repair shop for an estimate before replacing an expensive part.

Alignment is not the same as print scaling

Scaling changes the size of the entire page. Alignment changes how print elements line up with one another, or how the printed image sits on the paper. If the test page looks evenly reduced but its lines remain crisp and parallel, check the print dialog's scaling option. If edges are doubled or colors have fringes, printer alignment is a more likely cause.

Keep the original test page so you can compare it with a new print after any maintenance.