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Underline In PDF Online

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Underline In PDF Online

Did you ever need to underline or cross out text in PDF documents?


Underline In PDF Online with PDFfiller

In the past, you probably had to print the document, underline words or phrases with a pen, and either scan the document or send a hard copy to wherever it needed to go. Besides needing a printer and a scanner, the process probably took you far too much time to complete.


Now there is a far easier way to underline text in PDF documents. You can simply use PDFfiller!


To get started, upload a document to your account and open it in the editor. To draw a line, click the Line icon in the main toolbar. The line toolbar will appear under the editing tools. Click where you want to create the start point and drag to where you want to create the end point, release the mouse button and click OK.


Underline In PDF Online with PDFfiller account

To change the line’s color, click on the black square and choose the color you want. Use the slider before or after drawing a line to change its thickness.


Underline In PDF Online using PDFfiller

You can change the position of the line ends by dragging them.


Finally, you can always delete any line you've drawn, just select it and click the trash can icon that will appear.


To learn more about drawing lines in PDF documents online, please watch the following video:



When you use PDFfiller to underline text in PDF documents, you do not use paper, pencils, fax, and printer. And even better, you save yourself a lot of time!


If you like being able to underline text in PDF documents online, you might be interested in a whole lot of other great features that PDFfiller has to offer including highlighting and erasing content, adding pictures, text boxes and sticky notes, and creating fillable fields. Check out these tutorials to see the other great things that PDFfiller can do for you!


How to Underline Content in PDFs Online?

  1. To underline content in a PDF, upload your PDF document using PDFfiller's uploader.
  2. Choose the 'Line' button in the 'Tools' tab and draw a line. You can drag and move the line anywhere in your document.
  3. You can also click the 'Tools' tab and highlight, redact or erase text and images in your PDF.
  4. When you're done with editing, click the 'Done' button and email, print or save your document.
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General Questions About Underlining in PDF Online

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  • What is PDFfiller?
    PDFfiller is a web-based PDF editor. With PDFfiller, you can search for, edit, store and export PDF documents online without downloading and installing any software. PDFfiller also allows you to access and modify your PDF documents from any device anytime.
  • What browsers does PDFfiller.com support?
    PDFfiller.com supports Internet Exporter (IE), Google Chrome, and Mozilla Firefox.
  • Do I need to download or install any software?
    No downloads needed! PDFfiller.com is web-based application that does not need any additional software. PDFfiller.com supports any browser.
  • Can I edit a PDF document online?
    Yes. PDFfiller.com allows you to edit (modify, alter, correct, change, amend, revise, redact) any document with our various tools and features. You can rearrange, rotate, and delete, the pages. You can also, add text, images, and signatures to each page.
  • How to annotate PDFs?
    To annotate PDF documents, upload your document to PDFfiller, or choose the document your want to annotate in "My Forms" page and click "Fill" button. Open "Draw" tab and access the editor toolbar, you can have a variety of annotation features: highlight text, add comments, underline text and insert sticky notes or arrows.
  • Can I Annotate PDF?
    Yes, you can. Upload your PDF documents to PDFfiller, or choose the document you want to edit and click "Fill" button in PDFfiller's "My Forms" page. You can access to a variety of annotation features using the editor toolbar in "Tools" tab. To mark parts of text in the document, click the "Highlihght" button and select the text you'd like to highlight. To add a comment, click the "Text Box" button and place a text box anywhere in your document. To add a sticky note, click the last button of the toolbar and place a note anywhere in your PDF. You can change the notes' font setting using the buttons below the "Sticky Note" button. To underline text, click "Line" button and draw a line in your document. Place the line under the text you want to underline.
  • How to underline in PDF?
    To underline in PDF documents, upload your PDF documents to PDFfiller, or choose the PDF you'd like to annotate in "My Forms" page and click "Fill" button on the right. You can find the "Line" button in "Tools" tab. Select the area or sentence you'd like to underline by clicking and holding the button on the mouse to draw a line around. Release the mouse when you're done. You can change the size of the line using the editor toolbar.
  • Can I underline into PDF?
    Yes, you can insert multiple lines into PDF documents using PDFfiller. To underline into PDF documents, upload your PDF documents to PDFfiller, or choose the PDF you'd like to annotate in "My Forms" page and click "Fill" button on the right. You can find the "Line" button in "Tools" tab. Select the area or sentence you'd like to underline by clicking and holding the button on the mouse to draw a line around. Release the mouse when you're done. You can change the size of the line using the editor toolbar.
  • How to underline text in PDF certificate form?
    To underline text in PDF forms, upload your PDF documents to PDFfiller, or choose the PDF you'd like to annotate in "My Forms" page and click "Fill" button on the right. You can find the "Line" button in "Tools" tab. Select the area or sentence you'd like to underline by clicking and holding the button on the mouse to draw a line around. Release the mouse when you're done. You can change the size of the line using the editor toolbar.
  • What PDF editor can draw a line to PDF forms?
    PDFfiller can help you draw a line to any PDF document online. To draw lines in PDF documents, upload your PDF documents to PDFfiller, or choose the PDF you'd like to annotate in "My Forms" page and click "Fill" button on the right. You can find the "Line" button in "Tools" tab. Select the area or sentence you'd like to draw lines by clicking and holding the button on the mouse to draw a line around. Release the mouse when you're done. You can change the size of the line using the editor toolbar.
  • How do I write on a document?
    To write on a document, click anywhere on the document and begin typing.
  • Can I type multiple lines when I have a lot of text?
    Yes. Just use "Enter" to create a line break. You can also paste large chunks of text and use Enter to restructure the lines.
  • How do I edit font settings?
    To edit font settings, begin by clicking on the "Font" button. You can then change the font type, adjust the size and color. You can also, modify text in to bold, underline, and italics.
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