Learn how to change font size in a PDF using our online editor. We’ll show you exactly where to click, how to adjust, and update your PDF instantly.
If you’ve ever filled out a PDF form and couldn’t resize the text, or added new content but couldn’t get the font to match the rest of the document, you’re not alone.
PDF editors vary in how they handle text, but with Smallpdf, you can adjust font size in just a few clicks.
Below is the clear, step-by-step process, plus helpful tips and answers to common issues.
How to Change Font Size in a PDF Online (Free with Smallpdf)
Smallpdf makes it easy for you to adjust text in any PDF forms, applications, contracts, presentations, worksheets, and more. Follow these steps to resize text inside a text box.
1. Open Your PDF in Edit PDF
Open the Smallpdf Edit PDF feature in your browser.
Click “Choose Files” or drag your PDF into the workspace.
You can also import the file directly from Google Drive, Dropbox, or OneDrive.
Open our PDF Editor
2. Click Inside Any Existing Text Box
If your PDF already has fillable or editable fields, click directly inside the text box.
You’ll see a toolbar appear above your text.
Click inside any existing text box
3. Type Your Text
Start typing inside the selected box. The formatting toolbar stays visible while you edit.
4. Adjust the Font Size
In the toolbar, find the font size number. Use the up and down arrows to increase or decrease the size. Your text updates in real time.
You can also:
- Switch between font styles
- Change alignment
- Adjust text layout
5. Move or Remove Text Boxes
Click and drag the text box to reposition it on the page. Use the trash icon if you need to delete it.
6. Download or Export Your Updated PDF
When you’re ready, click “Download.” Or choose “Finish” to export, print, or share your updated PDF.
Download or share your edited PDF
If Your PDF Has No Editable Text, Add a Text Box
For documents that don’t contain editable fields or text boxes, you can create your own.
1. Add Text To Your PDF
Click the “Add Text” option in the toolbar, then click anywhere on the page where you want to place your text box. A fresh, editable box will appear.
Add a text box to your PDF
2. Change Font Size in Fillable Form Fields
Fillable PDF forms sometimes behave differently from standard text boxes. Smallpdf supports font adjustments inside most form fields.
How to change text size in a form: 1. Click inside the form field. 2. Look for the formatting toolbar that appears above the field. 3. Use the size arrows to increase or decrease the font. 4. Check that the text fits properly within the field boundaries.
If the PDF restricts editing, Smallpdf can still handle most embedded form settings.
3. Save, Download, or Share Your Updated PDF
Once your formatting looks right, click “Download” to save your edited PDF. If you need to keep working:
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Use “Finish” to convert the file.
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Share it through Smallpdf.
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Save it back to Drive, Dropbox, or OneDrive.
If your file increased in size after editing, consider using Compress PDF to make it lighter.
More Than Just Font Size—Other Things You Can Do With PDF Editor
There’s much more you can do with PDF Editor beyond changing the font size in a text box. Our tool helps you customize and perfect any PDF.
While you’re editing, here are a few other features worth exploring:
- Change font style and alignment: Switch between Arial, Times New Roman, and more, plus adjust text alignment with a single click.
- Adjust text color: Make important text stand out by changing colors to match your brand or highlight key information.
- Add new text boxes: Insert text anywhere on the page to fill gaps or add additional information.
- Delete unwanted text: Remove errors, outdated information, or text that no longer applies.
- Highlight or annotate: Use the annotation tools to highlight important sections, add comments, or draw directly on your PDF to make it more interactive.
- Insert shapes or images: Insert images or shapes to enhance the layout and branding of your PDF file.
Why Changing Font Size in PDFs Matters
Correct font size in PDF increases readability, accessibility, and professionalism.
It also:
- Ensures your text fits inside form fields
- Creates a visual hierarchy so headings stand out
- Helps presentations and brochures look cleaner
- Improves how others view, print, or process your document
Whether you’re filling out government forms, formatting resumes, editing client documents, or preparing teaching materials, adjusting font size helps you create cleaner, more polished PDFs.
Editing text is just the beginning.
Start your free trial to access the full suite of Smallpdf tools for secure, smooth, and professional PDF management.
FAQs About Changing Font Size in a PDF
Why can’t I change the font size in my PDF?
Your PDF might have embedded fonts or editing restrictions. Try using Smallpdf PDF Editor, which can handle most protected documents and font limitations.
What’s the shortcut to change font size in a PDF editor?
In most online PDF editors, click the text and use the font size arrows in the formatting toolbar. Some desktop editors support “Ctrl+]” to increase and “Ctrl+ ” to decrease font size" .
How can I change text in a PDF for free?
Smallpdf offers free PDF editing with limited monthly usage. Upload your file to our PDF Editor and start editing text, including font size changes, at no cost.
How do I change the PDF display size vs. the actual font size?
PDF display size (zoom) affects how you view the document, while font size changes the actual text. Use your browser’s zoom or the PDF viewer’s magnification for display. Use editing tools for permanent font size changes.
How do I reduce font size in a text box?
Open the file in Smallpdf PDF Editor and click on the text box you want to edit. A formatting toolbar will appear, and you can use the arrows to decrease the font size.
Can I change font size without special software?
Yes! Online PDF editors like Smallpdf work directly in your browser. Just upload your file and start editing font sizes immediately.
