Skip to content

Edit & annotate

Underline Text

Underline selected passages.

Options

Place text, images, links, shapes and marks exactly where you want them on the page.

Open in editor

Add a file to begin.

How it works

  1. 1Upload your file — drag it in or pick it from your device.
  2. 2Choose the options you need; defaults work for most files.
  3. 3Press Process and watch the progress in real time.
  4. 4Download the result. Anonymous files are deleted shortly after.

What this tool does

  • Accepts: .pdf · one file at a time
  • Produces: pdf
  • Runs on: the pdf worker, in an isolated process with a 3-minute ceiling
  • Account: required, because the result is stored in your workspace
  • API: available as toolSlug: "underline-pdf"

Questions

Is this an annotation or a change to the text?

An annotation. The underlying text is untouched and the underline can be removed later.

Can I underline and highlight the same passage?

Yes, annotations stack independently.

Security note

Files are checked to be what they claim (by content, not extension), processed in a sandboxed worker with no network, and deleted on the schedule your plan sets. We do not run antivirus and do not claim to — please do not upload files you do not trust. Read the security page.