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You may need to change font size in PDF to improve readability without zooming. This post offers a guide on how to change font size in PDF with MiniTool PDF Editor, Adobe Acrobat, and pdfFiller.

PDF files are widely used for business documents, contracts, reports, resumes, eBooks, and academic papers because they preserve formatting across different devices and operating systems.

Whether you're trying to increase font size in PDF for better readability or decrease font size in PDF to fit more content on a page, knowing how to change font size in a PDF is essential.

Unlike Word documents, most PDF files use a fixed-layout format, meaning every text element is positioned precisely on the page.

In this guide, we'll introduce several reliable tools that make the process easier, including MiniTool PDF Editor, Adobe Acrobat, and pdfFiller.

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How to Change Font Size in PDF with MiniTool PDF Editor

MiniTool PDF Editor is an all-in-one PDF editor that allows you to edit, convert, merge, split, compress, annotate, and manage PDF files efficiently.

One of its most useful features is the ability to edit existing text and adjust font properties, including font size.

It is important to note that to change the font size in a PDF, the document should be a standard PDF. Scanned PDFs or image-only PDFs cannot be edited, let alone have their font size altered. You should make PDF editable.

Its key features:

  • Edit text and images in PDFs
  • Change font size, font style, and font color
  • Convert PDFs to Word, Excel, PPT, and images
  • Merge and split PDF files
  • Compress PDF documents
  • OCR scanned PDFs
  • Add annotations, comments, and signatures

MiniTool PDF EditorClick to Download100%Clean & Safe

Here is how to change font size in PDF using MiniTool PDF Editor:

  1. Download and install MiniTool PDF Editor. Open your PDF file with this software.
  2. Click Edit on the toolbar and click Edit All.
  3. Now, the PDF file is in the Editing mode. Then you can select the text whose font size needs to be changed.
  4. Go to the menu bar and adjust the PDF font size within the text box. Meanwhile, you can change the font style and color.
The MiniTool PDF Editor interface with the Edit, Edit All, and font size options selected.

Alternatively, there is another method for changing the font size in a PDF: converting the PDF into an editable Word document and then changing the font size.

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How to Change Font Size in PDF with Adobe Acrobat

Adobe Acrobat Pro is one of the most popular PDF editing tools available today. As the creator of the PDF format, Adobe provides extensive editing capabilities.

Now, learn how to change font size in Adobe Acrobat:

  1. Open your PDF in Adobe Acrobat Pro.
  2. Click Edit (or go to Tools > Edit PDF) to enter editing mode.
  3. Highlight the text you want to change. A blue text box will appear around it.
  4. Locate the Format panel on the left or right side of the screen.
  5. Select a new size from the Font Size drop-down menu.

How to Change Font Size in PDF Online

If you only need to edit a PDF occasionally, online PDF editors can be convenient.

Popular online PDF editing services include:

  • pdfFiller
  • PDFescape
  • Sejda PDF
  • iLovePDF

How to increase font size in PDF? Here, we take pdfFiller as an example:

  1. Log into your pdfFiller account and upload the PDF file.
  2. Click directly on the existing text you wish to edit, or click the Text tool in the top panel to place a new text box.
  3. Once you click a text box, a floating formatting toolbar will appear directly above it or at the top of the page.
  4. Locate the Font Size dropdown menu (usually displaying a number like 12pt) and select or type your desired size.
  5. Click outside the text box or hit Apply to save your edits.

How to change font size in PDF? This post offers 3 methods to do that.Click to Tweet

How to Change Font Size in PDF FAQ

1. Can I change font size in a PDF for free?
Yes. Some online PDF editors and free PDF editing tools allow basic font size modifications. However, advanced editing features may require a premium version.
2. Why can't I edit or select the text in my PDF?
The text might be part of an image, or the document may have security permissions that restrict editing. You will need the author's password or an OCR tool.
3. Does changing font size affect PDF formatting?
Yes, changing the font size in an existing PDF affects its formatting. PDFs are fundamentally designed to preserve exact, static page layouts, much like a printed image.
Adjusting font sizes triggers specific layout shifts, with the severity depending on whether you are editing the document or just viewing it.
4. Can I edit scanned PDFs?
Yes. You can edit scanned PDFs by using OCR (Optical Character Recognition) technology, which converts static, image-based scans into searchable, editable text. Use OCR-enabled software such as MiniTool PDF Editor or Adobe Acrobat Pro.
5. Can I change the font size of all text in the PDF at once?
No, you cannot safely change the font size of all text in a PDF at once within a standard PDF editor without severely breaking the document's layout.
6. Can I change the font size in a PDF fillable form?
Yes, you can change the font size in fillable form, but whether you can do it before or while filling out the form depends on the tool you are using and whether the document is locked.

Bottom Line

Changing font size in a PDF is a simple operation. This post offers 3 approaches to do that. Among them, MiniTool PDF Editor is often recommended for beginners because of its simple interface and comprehensive PDF management features.

If you encounter issues when using MiniTool PDF Editor, contact us by sending an email to [email protected]. We’ll get back to you as soon as possible.

About The Author

Vega
Vega

Position: Columnist

Vega enjoys helping people with computer problems, including disk management, data recovery, data bacckup, and more. She is constantly expanding her knowledge in related fields. And she will continue to bring more easy-to-understand professional articles to help people solve various problems on the PC.