The simplest way to edit a PDF depends on what you're changing

Most PDFs can be edited directly in free tools you already have or can download without cost. If you're changing text, adding notes, or moving images around, Adobe Acrobat Reader (the free version) lets you add comments and fill forms. If you need to replace or delete text, LibreOffice Draw or Inkscape work on Windows, Mac, and Linux. For quick fixes like highlighting or signing, your web browser or phone can often do it without installing anything.

The tool you pick depends on whether the PDF is a scanned image (a photo of a document) or a real PDF with selectable text. Scanned PDFs need different software because the text isn't actually text — it's a picture of words. Real PDFs let you click on words and change them directly.

Key Takeaways

  • Adobe Acrobat Reader (free) lets you add comments, highlight, and fill forms in any PDF without installing extra software.
  • LibreOffice Draw and Inkscape are free tools that can edit, delete, and replace text in PDFs on any operating system.
  • Scanned PDFs (images of documents) need optical character recognition (OCR) software to make the text editable, which most free tools do not include.
  • Your web browser can edit PDFs if you upload them to Google Drive, OneDrive, or similar services, though changes stay in the cloud unless you download the file.
  • Paid software like Adobe Acrobat Pro offers the most control but costs money and is only necessary if you edit PDFs constantly.

Using Adobe Acrobat Reader for comments and form filling

Adobe Acrobat Reader is free and works on Windows, Mac, iPhone, and Android. Open your PDF in Acrobat Reader, then look for the comment tools in the toolbar — usually a speech bubble or pencil icon. You can highlight text, add sticky notes, draw boxes around sections, and underline words. These changes stay in the file when you save.

If the PDF has form fields (boxes meant for you to type in), Acrobat Reader lets you fill them directly. Click in any field and type. When you save, your answers stay in the document. This works for tax forms, job applications, and rental agreements that have built-in form boxes.

Acrobat Reader cannot delete or replace the actual text in the document — only comment on it. If you need to change what the document says, not just mark it up, you need a different tool.

Editing text directly with LibreOffice Draw

LibreOffice Draw is free software that opens PDFs and lets you edit the text inside them. Download it from libreoffice.org, install it on your computer, then open your PDF file. Click on any text and you can change it, delete it, or add new text. You can also move images, resize them, or delete them.

LibreOffice Draw works best on PDFs that are not scanned images. If your PDF is a real document (created in Word, Google Docs, or similar), the text will be selectable and editable. If it's a scanned image or a photo of a document, the text will not be editable — you'll see the words but won't be able to click and change them.

When you finish editing, go to File > Save As and choose PDF to save your changes. LibreOffice will ask whether to save as ODF (its native format) or PDF. Choose PDF to keep the file in the same format.

Using Inkscape for more control over layout and images

Inkscape is free design software that also opens and edits PDFs. It gives you more control over positioning and styling than LibreOffice Draw, but it has a steeper learning curve. Download it from inkscape.org, open your PDF, and you can edit text, move objects around, change colors, and adjust images.

Inkscape is useful if you're redesigning a document or need to move elements around significantly. For simple text changes, LibreOffice Draw is usually faster. Like LibreOffice, Inkscape works best on PDFs with real text, not scanned images.

Editing PDFs in your web browser or cloud storage

If you use Google Drive, OneDrive, or Dropbox, you can upload a PDF and edit it without installing software. In Google Drive, right-click the PDF and select "Open with" > "Google Docs." The PDF converts to a Google Doc, where you can edit text, delete sections, and add images. When you're done, download it as a PDF again.

This method is convenient if you're already in the cloud, but the conversion sometimes scrambles formatting, especially in complex documents. It works well for simple text documents but can mess up layouts with multiple columns or unusual spacing.

OneDrive and Dropbox have similar features. OneDrive lets you edit PDFs directly in the browser without converting them, though the editing tools are more limited than Google Docs.

What to do if your PDF is a scanned image

If your PDF is a scan or photo of a document, the text is not actually text — it's a picture. You cannot click on the words and change them with the tools above. To make scanned text editable, you need optical character recognition (OCR) software, which reads the image and converts it to real text.

Free OCR tools include Tesseract (command-line software for advanced users) and online services like ilovepdf.com or smallpdf.com, which let you upload a scanned PDF and download it with searchable, editable text. These services work in your browser and do not require installation.

After OCR converts your scanned PDF, you can edit it with LibreOffice Draw or Inkscape like any other PDF. Keep in mind that OCR is not perfect — it can misread handwriting, faint text, or unusual fonts. Always check the converted text against the original.

When to use paid software like Adobe Acrobat Pro

Adobe Acrobat Pro (the paid version, not the free Reader) offers more features: better text editing, batch processing multiple files at once, and more reliable OCR for scanned documents. It costs about $180 per year or $15 per month.

You only need Acrobat Pro if you edit PDFs constantly as part of your job. For occasional edits, the free tools above do the job. Acrobat Pro is worth the cost if you're processing dozens of scanned documents or need professional-quality OCR, but most people can get by without it.

Frequently Asked Questions

Can I edit a PDF on my phone?

Yes. Adobe Acrobat Reader (free) works on iPhone and Android and lets you add comments, highlight, and fill forms. For more extensive editing, apps like Xodo or PDFtk are available, though they have fewer features than desktop software. Cloud services like Google Drive also work on phones.

Why can't I edit the text in my PDF?

Your PDF is likely a scanned image or a photo of a document. The text is a picture, not real text. You need OCR software to convert it to editable text first. Try uploading it to ilovepdf.com or smallpdf.com and selecting the OCR option.

Will editing a PDF change the original file?

Only if you save over it. When you edit a PDF, always use "Save As" to create a new file with a different name. This keeps your original unchanged in case you need to refer back to it.

Is it legal to edit a PDF I don't own?

Editing a PDF you don't own without permission is not legal. You can edit PDFs you created, own, or have been given permission to change. If someone sends you a form to fill out, that's permission to edit it.

What's the difference between LibreOffice Draw and Inkscape?

LibreOffice Draw is simpler and faster for basic text editing. Inkscape gives you more control over design and layout but takes longer to learn. For most people, LibreOffice Draw is the right choice.