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3 Ways to Draw Lines on PDF Documents and How to Choose Between Them

Sometimes written content just doesn't cut it when it comes to a PDF document. It can, in fact, be much better to draw lines on PDF documents to better illustrate your point. After all, a picture paints a thousand words! Drawings on a PDF can enhance the readability of your document and help explain a point without lengthy paragraphs.

So, what tools are out there to draw a line on a PDF, and how should you use them? Read on to find out how to make your text documents more reader-friendly with line-drawing tools like UPDF.

How to Draw a Line on PDF Documents with UPDF

UPDF is a favorite tool for annotating and editing PDF documents. It's AI-integrated software allows users to fill, sign, edit, and annotate PDF documents, and utilizes current AI technology to translate and summarize text too. Users can even convert images to text with the advanced OCR feature. The annotation features of UPDF are perhaps one of the stand-out components of the platform, including the shape-drawing and line-drawing tools.

Draw a Straight Line in PDF

Step 1. Download UPDF

Firstly, you need to download UPDF. You can choose to download the software for free or choose a paid plan to unlock more premium features. If you purchase an annual plan you can save up to 57%.

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Step 2. Choose the Line Option

Once the download has been completed, open your document in UPDF and go to "Comment" mode. This is where all of the drawing features are listed. Click the shape icon, and then select the line option underneath it.

draw lines on pdf select the line option

Step 3. Add Lines to PDF and Change Properties

Set the color, opacity, and thickness of the line using the tool. Choose from one of the preset colors or input your own hex code for a custom color. Set the opacity from 0% to 100%, and set the line thickness, measured in pixels.

After setting the properties of the line, you can use your cursor to draw on your PDF document freely. You can also change the properties by clicking or right-clicking the line and choosing the "Properties" option.

draw lines on pdf draw lines

Draw Free-Form Curved Lines in PDF

Use the Pencil Tool to Draw Lines on PDF

In UPDF you can draw both straight lines and free-form curved lines, depending on your preference. You can use the Pencil tool to draw the line on your PDF. Delete, move, copy, cut, or edit it as you wish by right-clicking and selecting 'Properties'.

draw lines on pdf pencil tool

Other features of UPDF

The annotation tool is a great tool for adding lines to your PDF document, but it can also do many other things! The UPDF annotation tool also allows users to add:

  • Standard or custom stamps such as 'Approved', 'Confidential', and 'Sign Here'
  • Text comments
  • Sticky note comments
  • Text markups like highlighting, strikethrough, underline, and squiggly underline
  • Pencil drawing markings
  • Other shapes like rectangles, ovals, and arrows
  • Stickers, including emojis and interesting text.

In addition to the multi-functional annotation feature, UPDF also allows users to edit PDF documents, summarize PDF documents with AI, and convert PDF documents to other formats like JPEGs and Word Documents. The Optical Character Recognition (OCR) feature also allows users to easily convert written content within images into text documents. Download UPDF now and try all the features yourself!

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Video Tutorial on How to Draw on PDF on Windows


How to Draw Straight Lines in Adobe PDF with Acrobat?

We recommend installing UPDF as your one-stop shop for all things PDF annotating. But if you've already got Adobe Acrobat installed, then follow these instructions to learn how to draw a line in Adobe Acrobat

  1. Firstly, open your PDF in Acrobat by selecting 'File' and then 'Open'.
  2. Access the commenting tools by clicking 'Comment' on the bar on the right-hand side, then choose 'Drawing tools', and select 'Line'.
  3. Draw a line onto the document. For a straight line, press the Shift key while you do this.
  4. To adjust the color, thickness, and opacity click the icon with four lines in the Comment toolbar.
draw lines on pdf adobe

It's really easy to draw lines in Adobe Acrobat to emphasize key information, create diagrams to aid readability and make notes on a PDF document without adding a sticky note, stamp, or text box. Since drawing is made simple and easy to do, Adobe Acrobat is a valuable tool for both personal and professional use. Once you're used to Adobe's complex interface, users will be able to make a number of changes to customize their PDF and ultimately increase the productivity of their team.


How to Draw a Line in PDF Online

If you don't want to install any software to draw a line on your PDF document, then the handy tool by Smallpdf is just what you need. Follow these steps to add lines to PDF documents.

  1. Head to the Smallpdf PDF Editor and upload your PDF.
  2. Choose the pencil tool via the toolbar at the top of the editor.
  3. Choose the color, thickness, and opacity of the line that you want to draw.
  4. Draw the line (or lines) on your document and download the PDF when you've completed your drawings.
draw lines on pdf small pdf

One of the many advantages of using Smallpdf's platform to annotate your PDFs is the intuitive, straightforward interface. Because users don't need to download any software, it's much easier to get to grips with how the platform works. This means time-saving not researching how to use the platform, and of course a cost-saving aspect too.

There are no limitations as to where you can use this software since it's a website that is already compatible with all browsers and devices by design. There's no need to install different versions for iOS, Android, or Windows or Mac devices.

However, if you're looking for how to draw straight lines in PDF then you'll need to use a different tool, since Smallpdf only lets users draw free-form lines. There are many limitations to the free version, for example, you can't access the Edit tool until you upgrade to the premium version. There are limitations on the file size you upload and there is a download limit for processing PDF files.

Which Method Should You Use to Insert Lines in PDF Documents?

 UPDFAdobe AcrobatSmallpdf
Straight line drawings
Pencil drawing
PricingThe cheapest plan is US$179.88 per year (US$14.99 per month), with more comprehensive plans available to unlock more featuresLots of options for editing and annotating a PDF
Users can draw straight lines and free form lines
Free version available, or premium pricing cheapest plan is US$84 per year, with more comprehensive plans available to unlock more features
ProsUser-friendly interface, a wide variety of functions
Affordable annual pricing
Users can draw straight lines and free-form
The free version lets users draw lines
No account registration or download required
Free version lets users draw lines
No account registration or download required
ConsIt is a relatively new product.Expensive
Complex interface that takes getting used to
The free version does not let users draw lines
No straight-line tool
Limitations for the free version
Rating4.8/54.7/54.3/5

With the highest rating and most inexpensive pricing, it's easy to see why UPDF is the clear winner if you want to insert a line in a PDF document.

So, why add a line in PDF documents? Drawing visual diagrams on your PDF breaks up the large paragraphs and makes the document more digestible to readers. Coupled with great headings, a contents page, and photos, lines can be used not only to emphasize key areas but also to guide the readers easily through the document. Lines and other shapes can be used to aid readability on lots of different devices, whether the PDF is being viewed on a computer, tablet, or mobile phone.

Whilst Adobe Acrobat and Smallpdf both offer great solutions for annotating a PDF document, UPDF is the clear favorite amongst users, both individuals and businesses. Download UPDF to unlock the full benefits of this innovative platform.

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