4 Easy Methods to Change the Font Size in PDF Fillable Format You Should Know

Last Updated on November 1, 2022 by Tina Clark

When you need to fill in a PDF file shared by others, changing the font size in PDF fillable format should be important. It is easy to follow and will not require any complex steps with some professional PDF editors. You can have more amazing ideas on how to change font size in PDF with the compiled list with 4 easy methods. Just read the article and choose the desired one according to your requirements.

Change Font Size in PDF

Part 1: The Simple Way to Change the Font Size in PDF on Win/Mac

It is a must that you change the font size in PDF in creating a new document or filling-in PDF documents, especially when you need to retain the original style and avoid positioning improperly. PDFelement is a versatile PDF editor with some advanced editing and managing features, including altering the PDF font size and style, tweaking text formatting/text font, and replacing the texts with the original ones.

1. Adjust the font sizes, text fonts, text formatting, and others on Win/Mac.

2. Manage the texts from the PDF, such as replacing, inserting, deleting, etc.

3. Perform OCR algorithms to extract the texts and images from a PDF file.

4. Add text annotations with underline, highlight, and strikethrough for PDFs.

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Step 1: Download and install PDFelement before launching the program. Click the Open button to browse the location of your PDF file. Drag and drop the PDF file into the allotted interface. Click the desired thumbnail of the PDF page to view it on a full screen.

Open PDF for Cropping PDFElement

Step 2: Double-click to select the desired text you want to alter. After that, you can change the font size in the PDF fillable format from the Text column. Click the Font Size button from the top window section and choose the desired font size you want.

Change Font Size for PDF Form PDFElement

Step 3: Click the Add Text icon from the Text column to add new text to your PDF document. If you need to change the font size for the text in the original PDF, you only need to select the text and go to the text panel to change and apply the new text size in the PDF.

Change Text Size in PDF PDFElement

Step 4: To change the font size in the fillable PDF form, simply double-click the text content from the Form tab. Go to the APPEARANCE menu from the right side of the screen to start changing the font size. Just adjust the different parameters to go with the original texts.

Change Fill in Font Size for Form PDFElement

Step 5: Preview the new texts to the PDF form and complete it accordingly. Once you fill in the text for the PDF document, you can go to the File menu and click the Save button to save the PDF form. After that, you can share the PDF form with others.

Save PDF Form PDFElement Win Download Mac Download

Part 2: How to Change the Font Size in PDF Fillable Format via Preview

Preview is a free PDF reader and editor to change the font size in PDF on Mac. It allows you to customize font size, font color, and others in a fillable PDF form easily. Moreover, you can make bookmarks and perform some basic editing for the PDFs.

Step 1: You can right-click the fillable PDF form, choose the Open with button, and select the Preview app to open it. Browse the PDF file with the program and fill in the form with the desired font size. It is the built-in method for Mac to edit PDF documents.

Step 2: From the top menu section, you can go to the Tools menu and click the Text button from Annotate to add new texts to the PDF. Just click the T icon located in the Preview toolbar section to change the font size in the fillable PDF form directly.

Step 3: Simply type the texts into the PDF form before clicking the A icon to change the font properties, including the color, size, and placement. When you get everything done, you can click the File menu and choose the Export as PDF option to save the fill-in PDF form.

Change Font Size in Preview

Part 3: How to Change the Font Size in PDF with Adobe Reader

Adobe Acrobat is the most popular PDF editor and filler to edit text in a fillable PDF form. It provides amazing editing tools, which you can easily alter the text style, color, space, and size. You can highlight the desired texts, add annotations and flatten a PDF easily.

Step 1: Launch Adobe Acrobat on your computer after installation. Drag-n-drop the desired PDF into the program. Go to the Tools menu and choose the Edit PDF option to enter the edit mode, in which you can find the texts editable with frames.

Choose Create PDF Adobe

Step 2: Click the text you want to change, which will activate the FORMAT menu in the right part. It enables you to change the fonts, font sizes, format, and other settings. Select the text and change the font size in the drop-down list accordingly.

Change Font Size to Text Adobe

Step 3: When you need to a fill in the PDF form with the desired font size, you can click the column you want to insert the text and follow the same process to select the font size from the FORMAT menu. Moreover, you can adjust the other parameters beforehand.

Fill in PDF Font Size Adobe

Part 4: How to Change the Font Size in PDF Online

Soda PDF has a user-friendly interface when it comes to customizing fonts. The same process of installing fonts into Microsoft Word goes to the Soda PDF method. If you need to find the desired font and change the font size in PDF fillable form, here is the process.

Step 1: Search and choose the custom font you like to install. You can find pre-installed fonts that are useful in changing fonts. Download your chosen custom font to your computer by clicking the Download button from Font within the online PDF filler.

Step 2: Downloaded font will be transferred to the compressed zip folder. You will find the file with the font and the text document once you open the folder. The actual font file will be presented as (.ttf). After that, you have to add the fonts to the online PDF editor.

Step 3: Install the custom font on your computer. To perform such a task, you need to access your computer’s font folder. You can find it under the following path Control Panel\Appearance and Personalization\Fonts. After that, you can use the fonts.

Step 4: Once the Soda PDF is open, the application will make use of the font list on your Windows to automatically upload the fonts. After that, you can choose the fonts from the dropdown and change the font size in the PDF fillable format to save the changes.

Change Font Size Online Soda PDF


When you need to fill in a PDF form, changing suitable font size is important to make the text in the desired position. Here are the workable methods you should know for different scenarios. Just learn more about the process and choose the desired one according to your requirements.

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