Lines on Every Scan? Clean This
Every scan comes out with the same vertical line in the same place. That consistency is good news: a speck of dust or ink on the scanner glass sits in the sensor's path and draws the line. This guide finds the speck and removes it.
TL;DR / Quick Fix
Quick fix: clean the thin glass strip (on feeder scanners) or the main glass (on flatbeds) with a microfiber cloth and a little glass cleaner. The line sits exactly where the speck is — clean that spot. If the line survives cleaning, the sensor itself may be failing.
Follow these steps
- Find which glass the line uses. On a feeder scanner, the thin strip of glass does the work; on a flatbed, the big glass. Clean the one your scan path uses — the line's position maps to the speck's position.
- Clean with microfiber and glass cleaner. Spray cleaner on the cloth, not the glass, and wipe the strip thoroughly. Ink dots and correction-fluid flecks are the usual line-drawers.
- Check for scratches. Hold the glass at an angle to the light. A scratch in the glass draws a permanent line no cleaning removes — the honest diagnosis.
- Clean the white backing too. Wipe the white calibration strip on the lid. Dirt there confuses the sensor's calibration and can add bands alongside the line.
- Test with a blank page. Scan a blank white page after cleaning. A clean scan proves the fix; a surviving line points to sensor damage.
- Try the flatbed as a workaround. If the feeder's strip is scratched, scan from the flatbed instead. It bypasses the damaged strip entirely — the same workaround logic as streaky prints having multiple causes.
What NOT to do
- Do not scrub with paper towels. They scratch scanner glass — microfiber only, with light pressure.
- Do not spray cleaner directly on the glass. Liquid seeps under the edges and stains the optics beneath.
- Do not ignore a scratched strip. Cleaning a scratch is futile; use the flatbed or replace the strip.
- Do not assume the scanner is dead. A single consistent line is a dirty-glass problem in the vast majority of cases.
Frequently asked questions
Why is there a line on all my scans?
A speck of dust, ink, or correction fluid on the scanner glass sits in the sensor's path and draws the same line every time.
How do I clean a scanner glass strip?
Microfiber cloth with a little glass cleaner sprayed on the cloth. Wipe the full length of the strip.
The line won't go away after cleaning — now what?
Check for a scratch at an angle to the light. A scratch needs the strip replaced or the flatbed used instead.