Underline PDF

Add visible underlines to PDF text lines or page areas locally with color, stroke, page range, and browser-only export controls.

Options

Underline color and stroke width controls.

X, Y, width, and line box placement.

Selected page ranges or all pages.

Local export with before and after size details.

How to underline a PDF

  1. Upload PDF — Upload one PDF and choose target pages.
  2. Position line — Position the underline under text or an image-only area.
  3. Set style — Set the underline color and stroke width.
  4. Export — Export and download the underlined PDF.

FAQ

Can I underline scanned PDFs?
Yes. This places visible line overlays, so it works on image-only pages.
Can I change the color?
Yes. Choose any underline color and stroke width before exporting.
Are my PDFs uploaded?
No. Inspection, preview, and export run in your browser.