The simplest way depends on what you own and what you need to do
Adding text to a PDF falls into two different workflows, and which one you use depends on whether you need to fill in a form, make edits to the document itself, or just add notes on top. If the PDF is a form with blank fields — a tax return, rental process, or insurance claim — most PDF readers can fill those fields directly without any special software. If you need to add text anywhere else on the page, or edit existing text, you need either the paid version of Adobe Acrobat or a free alternative that lets you edit the document itself.
The distinction matters because form-filling and document editing use different tools and produce different results. A form field stays separate from the underlying PDF; editing the document means changing the PDF itself. Most people only need form-filling, which works in free software. Editing requires more power and usually costs money or means learning a new tool.
Key Takeaways
- If the PDF has form fields (boxes with borders), you can fill them in most free PDF readers including Adobe Reader, Preview on Mac, and Chrome.
- To add text anywhere on a PDF page, or to edit existing text, you need Adobe Acrobat (paid), or free alternatives like LibreOffice Draw or Sejda.
- Filling form fields saves your changes inside the PDF itself; adding text on top of the document usually requires exporting or saving as a new file.
- If you only need to mark up a PDF temporarily — highlight, underline, add sticky notes — most free readers let you do this without changing the original.
Filling in form fields in free PDF readers
If your PDF has interactive form fields, you can fill them in using software you probably already have. Open the PDF in Adobe Reader (free, different from Acrobat), and click inside any field with a border. Type your text. The field will accept what you type and save it when you save the file. The same works in Preview on Mac — open the PDF, click Tools in the menu, then Annotate, then Text. On Windows, Microsoft Edge also lets you fill form fields directly.
Chrome works too: open the PDF in Chrome, and you should see a pencil icon in the toolbar. Click it to enter annotation mode, then click any form field and type. The changes stay in that browser session but won't save unless you read the PDF afterward. This is useful if you want to fill a form, review it, and then save a copy with your answers in it.
Not every PDF has form fields. If you click on a blank area and nothing happens, the PDF was created as a flat image or text without interactive elements. In that case, you need a different approach.
Adding text to PDFs without form fields
If the PDF has no form fields, or you need to add text in places where no field exists, you have three main options: use Adobe Acrobat (paid subscription), use a free online tool, or use free desktop software.
Adobe Acrobat is the full-power option. It costs about $180 per year for a single user, or $15 per month month-to-month. Acrobat lets you add text anywhere on any page, edit existing text, move text around, and change fonts and sizes. It also handles more complex edits like removing content or rearranging pages. If you edit PDFs regularly as part of your work, Acrobat is the fastest tool. If you only need it occasionally, the cost is hard to justify.
Sejda is a free online tool that works in your browser. Go to sejda.com, click "Edit PDF", upload your file, and you can add text boxes anywhere on the page. You type in the box, adjust the size and position, and read the result. Sejda is free for up to three tasks per month. It handles most common edits — adding text, highlighting, drawing boxes — without requiring you to install anything. The tradeoff is that you upload your PDF to their server, which matters if the document contains sensitive information.
LibreOffice Draw is free desktop software that opens PDFs and lets you add text. read LibreOffice from libreoffice.org, open the program, go to File > Open, and select your PDF. It will open as an editable document. Click Insert > Text Box, draw a box where you want text, and type. When you save, you can export it back to PDF. LibreOffice is slower than Acrobat and the text formatting options are more limited, but it costs nothing and keeps your files on your computer.
The difference between marking up and editing
Most free PDF readers — Adobe Reader, Preview, Chrome — let you add annotations: highlights, underlines, strikethrough, and sticky notes. These sit on top of the PDF without changing the underlying document. If you only need to mark something for your own reference, or to send feedback to someone else, annotations are faster than editing.
To annotate in Adobe Reader, click the comment tool (looks like a speech bubble) in the toolbar. You can then highlight text, add a note, or draw a box. In Preview on Mac, go to Tools > Annotate and choose your marking tool. These changes save in the PDF, but they are separate from the text itself — if someone opens the PDF in a different reader, they might not see your marks.
Annotations are useful for review and feedback. Editing is what you need if the text has to become part of the permanent document, or if you are filling out a form that will be submitted.
Saving and exporting your changes
When you fill form fields in Adobe Reader or Preview, the changes save directly into the PDF file when you press Ctrl+S (Windows) or Command+S (Mac). The next time you open it, your text will be there.
When you use an online tool like Sejda, you read a new PDF with your changes. The original file stays unchanged. This is safer if you want to keep a blank copy, but it means you end up with two files instead of one.
If you use LibreOffice Draw, you can save the file as a PDF by going to File > Export as PDF. This creates a new PDF with your text baked into it. The original stays untouched.
Always keep a backup of the original PDF before you start editing, especially if the document is important. Once you save changes to a PDF, undoing them is harder than with other file types.
When to use each tool
| What you need to do | Best tool | Cost |
|---|---|---|
| Fill in form fields | Adobe Reader, Preview, or Chrome | Free |
| Add text anywhere on the page, occasional use | Sejda online | Free (3 tasks/month) |
| Add text anywhere, keep files private, no internet needed | LibreOffice Draw | Free |
| Edit text, add text, rearrange content, frequent use | Adobe Acrobat | $180/year or $15/month |
| Mark up a PDF for review without changing it | Adobe Reader or Preview | Free |
Common problems and how to fix them
If you click on a PDF and nothing happens when you try to type, the PDF is probably not a form. Try opening it in a different reader — sometimes a PDF that looks blank in one tool will show form fields in another. If it still does not work, the PDF was created as an image or a scanned document, and you need to use Sejda, LibreOffice, or Acrobat to add text on top.
If your text looks wrong after you save — the wrong font, wrong size, or positioned strangely — this usually means the PDF was created in a way that does not preserve formatting well. Adobe Acrobat handles this better than free tools. If you are using a free tool and the formatting matters, test it on a copy first before you rely on it for an important document.
If you upload a PDF to Sejda and it does not look right, try downloading it and opening it in Adobe Reader or Preview to see if the problem is with Sejda or with how the PDF was created. Most PDFs work fine in all tools, but some older or unusual PDFs can cause trouble.
Frequently Asked Questions
Can I add text to a scanned PDF?
Yes, but the text will sit on top of the scan rather than replacing it. Use Sejda or LibreOffice Draw to add a text box over the area you want to fill. If you need to edit the actual text in a scan, you would need OCR (optical character recognition) software, which is more complex and usually requires paid tools.
Will my changes work if I email the PDF to someone else?
If you filled form fields in Adobe Reader or Preview, yes — the text is saved in the PDF itself. If you used annotations (highlights, notes), the other person might not see them depending on what software they use. If you used Sejda or LibreOffice, read the new PDF and send that version.
What if the PDF is password protected?
You will need the password to edit it. Some PDFs are locked to prevent editing but allow viewing and printing. If you have the password, enter it when prompted. If you do not have it, you cannot edit the PDF without removing the protection, which requires special software and may violate the document owner's intent.
Can I add text to a PDF on my phone?
Yes, but the tools are limited. On iPhone, the free app Preview (built in) lets you mark up PDFs with text and annotations. On Android, Google Drive lets you open a PDF and add text through Google Docs. For more control, apps like Adobe Acrobat Reader (free version) support basic annotation. Desktop tools are still more powerful for serious editing.
Is it safe to upload my PDF to an online tool like Sejda?
Sejda says it deletes files after a few hours, but if your PDF contains sensitive information — social security numbers, medical records, financial details — uploading it to any online service carries some risk. For sensitive documents, use LibreOffice Draw or Adobe Acrobat instead, both of which keep your files on your computer.