Adobe Reader cannot edit PDFs — you need Adobe Acrobat
Adobe Reader is the free program Adobe distributes for viewing and annotating PDFs. It cannot edit the text, images, or structure of a PDF document itself. If you want to change what a PDF actually says or looks like, you need Adobe Acrobat Pro, which is a paid subscription ($14.99 per month or $179.99 per year as of this writing).
The confusion happens because Adobe Reader can add comments, highlights, and sticky notes to a PDF — which feels like editing. But those annotations sit on top of the document without changing the underlying content. If someone opens the PDF in a different program or on a different device, they may not see your notes at all.
Before you pay for Acrobat, check whether what you actually need is annotation (which Reader does) or true editing (which it does not). If you need to change text or remove content, you have other options that cost less or nothing.
Key Takeaways
- Adobe Reader can highlight, underline, and add comments to a PDF, but cannot change the text or delete content.
- Adobe Acrobat Pro is the official tool for editing PDF text, images, and pages, and costs $14.99 per month or $179.99 per year.
- Free alternatives like PDFtk, LibreOffice Draw, and online editors can handle basic edits without a subscription.
- If you only need to fill in form fields, Adobe Reader can do that for free on most PDF forms.
- Annotations you add in Reader may not appear when someone else opens the file, depending on their software.
What you can do in Adobe Reader for free
Adobe Reader lets you add visual marks and notes without changing the PDF itself. You can highlight text in yellow, green, or other colors; underline or strikethrough text; and add sticky notes or pop-up comments that appear when someone hovers over them. You can also draw freehand marks with the pencil tool and add text boxes that float on top of the page.
If the PDF contains a form with fillable fields — text boxes, checkboxes, radio buttons — Adobe Reader can fill those in and save your answers into the file. This works on most official forms, tax documents, and applications. The form creator has to set up the fields for this to work; if the form is just a scanned image, Reader cannot fill it in.
To add these annotations, open the PDF in Reader, click the "Comment" button in the toolbar, and choose your tool. Your marks save into the file when you save it, but only if you save it as a PDF. If someone opens the file in a different PDF reader, they may see your comments, or they may not — it depends on how well that program supports Adobe's annotation format.
What you cannot do in Adobe Reader
Adobe Reader cannot change the actual text of a PDF. You cannot select a word and retype it, delete a paragraph, or move text to a different location. You cannot delete or rearrange pages, add new pages, or change images. You cannot alter fonts, colors, or formatting of the original content.
If you try to click on text in a PDF and type, nothing happens — Reader does not allow it. The only text you can add is in floating text boxes that sit on top of the document, which is not the same as editing the original content.
Adobe Acrobat Pro: what it does
Adobe Acrobat Pro is the paid version that can edit PDFs directly. It has an "Edit PDF" tool that lets you select text and change it, delete words or sentences, add new text in the same font and size, move text around, and edit images. You can delete entire pages, rearrange them, or add blank pages. You can change fonts, colors, and formatting to match the rest of the document.
Acrobat Pro also handles more complex tasks: combining multiple PDFs into one file, splitting a PDF into separate documents, compressing file size, and converting PDFs to other formats like Word or Excel. It can recognize text in scanned images (optical character recognition, or OCR) so you can edit a PDF that started as a photograph of a document.
The subscription costs $14.99 per month if you pay monthly, or $179.99 per year if you commit annually. Adobe also offers a free trial for seven days. If you only need to edit one or two PDFs, the trial may be enough; if you edit PDFs regularly, the subscription is worth considering.
Free alternatives to Acrobat Pro
PDFtk is a free command-line tool that can split, merge, and rotate PDF pages without needing to install anything. It works on Windows, Mac, and Linux. The downside is that it requires typing commands rather than clicking buttons, so it has a steeper learning curve than graphical software.
LibreOffice Draw is a free program that can open PDFs and edit them like a document. You can change text, delete content, and add new elements. The editing is not as polished as Acrobat Pro — text may not line up perfectly with the original formatting — but it works for simple changes. LibreOffice is free and runs on Windows, Mac, and Linux.
Online PDF editors like Smallpdf, ILovePDF, and PDFEscape let you upload a PDF, make edits in your browser, and download the result. Most offer a free tier with limits on file size or number of edits per month. The trade-off is that you are uploading your file to someone else's server, which matters if the PDF contains sensitive information.
If you need to convert a PDF to another format first — like Word or Excel — you can edit it there and convert back. Google Docs can open PDFs and let you edit them, though the formatting may shift. Microsoft Word can open PDFs directly on Windows and Mac, though again, complex layouts may not transfer perfectly.
When to use each tool
| What you need | Best tool | Cost |
|---|---|---|
| Highlight, underline, or add comments | Adobe Reader | Free |
| Fill in form fields | Adobe Reader | Free |
| Change text, delete content, edit images | Adobe Acrobat Pro | $14.99/month or $179.99/year |
| Simple text edits, basic formatting changes | LibreOffice Draw | Free |
| Merge, split, or rotate pages | PDFtk | Free |
| Quick edits without installing software | Online editor (Smallpdf, ILovePDF) | Free tier available; paid plans $6–$10/month |
How to tell if you need Acrobat Pro
Ask yourself: am I changing the content of the PDF, or just marking it up? If you are highlighting important sections, adding notes for yourself, or filling in blanks on a form, Adobe Reader is enough. If you are rewriting text, removing paragraphs, or restructuring the document, you need Acrobat Pro or an alternative editor.
Also consider how often you edit PDFs. If this is a one-time task, the free trial of Acrobat Pro or a free online editor makes sense. If you edit PDFs several times a month for work, the subscription cost may be worth it compared to the time you spend learning a free alternative.
One more thing: check whether the PDF is locked. Some PDFs have security settings that prevent editing even in Acrobat Pro. If you cannot edit a PDF in Reader, try opening it in Acrobat Pro or an online editor — they may be able to remove the restriction, depending on the security level.
Frequently Asked Questions
Can I edit a PDF on my phone or tablet?
Adobe Reader on iOS and Android can annotate PDFs but not edit them, just like the desktop version. For true editing on mobile, you need Adobe Acrobat Pro (subscription required) or a third-party app like Notability or GoodNotes on iPad. Most free mobile PDF editors are limited to annotation and form-filling.
What if the PDF is a scanned image?
If the PDF is a photograph or scan of a printed document, you cannot edit the text directly in any program until you run OCR (optical character recognition) to convert the image to searchable text. Adobe Acrobat Pro has built-in OCR. LibreOffice Draw and some online editors also support OCR, though results vary depending on image quality.
Will my edits stay in the PDF if I send it to someone else?
If you edit the PDF in Acrobat Pro or another editor, your changes become part of the file and will appear for anyone who opens it. If you only add annotations in Adobe Reader, they may or may not show up depending on what program the other person uses to open the file. To be safe, export or save the file as a new PDF after making changes.
Is there a way to edit a PDF for free without installing software?
Yes — online PDF editors like Smallpdf, ILovePDF, and PDFEscape work in your browser without installation. They have free tiers, though they may limit file size or number of edits per month. Google Docs can also open and edit PDFs if you upload them to your Google Drive, though formatting may shift.
Can I password-protect a PDF after editing it?
Adobe Acrobat Pro can add password protection and restrict editing, printing, or copying. Some free editors and online tools also offer this feature. Check the settings or export options in whatever program you use to see if password protection is available.