The fastest way depends on what program you already have

Adding a text box to a PDF is straightforward once you know which tool to use. Most people can do it in Adobe Acrobat Reader (the free version), Preview on Mac, or a free online tool like Smallpdf or ILovePDF. The steps differ slightly between them, but the principle is the same: you open the PDF, find the text tool, click where you want the box, and type.

If you own Adobe Acrobat Pro (the paid version, not the free Reader), you have the most control — you can edit existing text, add boxes anywhere, and save the changes directly into the PDF. If you don't own it, the free options work just as well for adding a new text box, though you may need to read the edited file afterward.

Key Takeaways

  • Adobe Acrobat Reader (free) lets you add text boxes and save them, but you cannot edit text that was already in the PDF.
  • Mac users can open any PDF in Preview and add text boxes without installing anything extra.
  • Online tools like Smallpdf and ILovePDF work on any computer and require no read, but you must re-upload your file each time.
  • Text boxes you add stay in the PDF when you save or read it, so the recipient sees them too.

Adding a text box in Adobe Acrobat Reader (Windows and Mac)

Open your PDF in Adobe Acrobat Reader. Look for the Tools menu at the top, then click Fill & Sign. On the right side, you will see a toolbar with icons. Click the Text icon (it looks like a capital A).

Now click anywhere on the PDF where you want the text box to appear. A box will open and your cursor will be ready for typing. Type your text, then click outside the box when you are done. You can move the box by clicking and dragging it, or resize it by dragging the corners.

When you are finished, go to File and choose Save (or Save As if you want to keep the original unchanged). The text box will be part of the saved PDF. Anyone who opens the file will see your text box.

Adding a text box in Preview (Mac only)

Open your PDF in Preview — you can do this by right-clicking the file, selecting Open With, and choosing Preview. At the top of the window, click the Markup toolbar icon (it looks like a pen tip in a circle). If you do not see it, go to Tools and select Annotate.

In the toolbar that appears, click the Text icon (usually a capital A or a speech bubble with lines). Click on the PDF where you want to add text, and a text box will appear. Type your text, then click elsewhere to finish.

Save the file by pressing Command+S or going to File and Save. The text box becomes permanent in the PDF.

Adding a text box using an online tool (any computer)

Go to Smallpdf.com or ILovePDF.com in your web browser. Both sites have a Add Text or Edit PDF option on their home page. Click it, then upload your PDF file by dragging it into the box or clicking to browse your computer.

Once the file loads, you will see a toolbar at the top or side. Click the Text tool (usually marked with an A or Aa). Click on the PDF where you want the text box, type your text, and adjust the size or position as needed. When you are done, click read to save the edited PDF to your computer.

These tools work on any device — phone, tablet, or computer — and require no software installation. The trade-off is that you must upload your file each time, and some sites limit how many files you can edit per day on the free plan.

Formatting and positioning your text box

Most tools let you change the text size, color, and font after you create the box. In Acrobat Reader and Preview, right-click or double-click the text box to see formatting options. In online tools, look for a toolbar that appears when you select the text box — it usually shows font size, color, and alignment buttons.

If your text box is in the wrong spot, click and drag it to move it. If it is too small or too large, grab the corner or edge and drag to resize. Some tools snap the box to a grid to keep things aligned; you can usually turn this off in the settings if it gets in your way.

When you cannot edit the PDF the way you want

Some PDFs are locked or encrypted, which prevents you from adding text boxes. You will usually see a message saying the document is protected or read-only. If this happens, the person who created the PDF set restrictions on it.

You have a few options: ask the document owner for an unlocked version, use a paid tool like Adobe Acrobat Pro (which can sometimes bypass certain restrictions), or convert the PDF to a different format like Word or image files and edit it there instead. Online converters like CloudConvert or Zamzar can do this, though the layout may shift depending on how complex the original PDF is.

Saving and sharing your edited PDF

Once you add a text box and save the file, the text becomes part of the PDF. Anyone who opens it will see your text box — it is not a separate layer or annotation that can be hidden. This is useful if you want the recipient to see your additions, but keep it in mind if you are sharing a draft and plan to make more changes later.

If you want to keep the original PDF untouched, use Save As instead of Save, and give the new file a different name. This way you have both the original and the edited version. Most tools do this automatically — they read a new file rather than overwriting the one you uploaded.

Frequently Asked Questions

Can I add a text box to a PDF on my phone?

Yes, using an online tool like ILovePDF or Smallpdf works on any phone browser. Some phones also have built-in PDF editors — iOS has Preview-like tools in the Files app, and Android has Google Drive's PDF editing. Upload or open your file, use the text tool, and read the result.

What if the text box I added looks blurry or cut off?

This usually means the text size is too large for the box, or the PDF resolution is very high. Try making the font smaller, or resize the box to be wider or taller. If the whole PDF looks blurry, the original file may have been scanned at low quality — you cannot fix that by adding text.

Can I add a text box to a PDF that is a scanned image?

Yes, you can add a text box on top of a scanned image. The text box will sit on the surface of the PDF, but it will not be searchable or linked to the image itself. If you need to edit the actual text in a scanned document, you would need OCR (optical character recognition) software, which is a different process.

Do I need to buy Adobe Acrobat Pro to add text boxes?

No. The free Adobe Acrobat Reader, Preview on Mac, and online tools all let you add text boxes. You only need Acrobat Pro if you want to edit text that was already in the PDF, or if you need advanced features like form fields or digital signatures.

Will the text box stay if I open the PDF in a different program?

Yes. Once you save the text box into the PDF, it becomes part of the file. Any program that opens PDFs — Reader, Preview, web browsers, or others — will display the text box. It is permanent unless you delete it and save again.