Skip to content
PzPDFzy

Underline PDF

Add a coloured rule under text you want to emphasise.

Drop your file here

Nothing is uploaded — your file is processed on this device.

Options for Underline PDF

Leave empty for every page. Use ranges like 2-5 and lists like 1,4,9.

Placement is measured in percentages from the top-left corner of the page, so it works on any page size.

How to underline pdf

  1. 1Upload the PDF.
  2. 2Set the page, position, width, colour and thickness.
  3. 3Apply and download.

About this tool

Underlining is a quieter form of emphasis than highlighting. It marks a line without adding a block of colour, which suits formal documents, printed copies and pages that already carry a lot of visual noise.

Give the page, the start position, the width and a colour, and a clean rule is drawn at that point. Thickness is adjustable from a hairline to a bold stroke, so it can be discreet or emphatic.

What it's good for

  • Emphasising a defined term in an agreement.
  • Marking corrections during a document review.
  • Underlining headings in a scan that lacks formatting.
  • Adding a subtle mark on a document that will be printed.

Features

  • Adjustable thickness

    From 0.5 pt hairline to 12 pt bold.

  • Any colour

    Match a review convention or keep it black.

  • Precise placement

    Percentage coordinates work on any page size.

  • Vector line

    Stays sharp when printed or zoomed.

Questions people ask

Does it detect the text automatically?
No — you set the position, which also lets you underline images and table rows.
Can I underline several lines?
Run the tool again on the result for each line.
Is the original changed?
No, you download a new file.

More edit tools