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

You can edit a PDF in three ways: use free software built into your computer, use a dedicated PDF editor you read, or use a web-based tool that runs in your browser. The right choice depends on whether you're adding text to a form, changing existing text, inserting images, or rearranging pages — and whether you want the file to stay on your computer or you're comfortable uploading it to a website.

Most people can solve their problem with the free option that came with their device. Windows includes a basic PDF reader that lets you mark up documents. Mac includes Preview, which handles text and image edits. If you need more control — like changing fonts, moving text around, or editing PDFs regularly — a dedicated editor makes sense. If you only edit PDFs once or twice a year, a web tool is faster than installing software.

Key Takeaways

  • Windows users can mark up PDFs in the built-in Reader app by opening the file and clicking the pen icon; Mac users can edit directly in Preview by double-clicking the text they want to change.
  • Free desktop editors like LibreOffice Draw and PDFtk handle more complex edits — adding text boxes, moving content, or changing page order — without uploading your file to the internet.
  • Web-based editors like Smallpdf and ILovePDF work from any browser but require you to upload your PDF to their servers, which matters if your document contains sensitive information.
  • Editing a PDF is different from converting it to Word or another format; editing keeps the PDF structure intact, while conversion creates a new document type that may need reformatting.

Using the PDF reader or viewer already on your computer

On Windows, open your PDF in the built-in Microsoft Edge browser or the Windows Reader app. Look for a pen icon or markup button in the toolbar — usually in the top right. Click it, and you'll see drawing and text tools. You can add text boxes, draw lines, or highlight sections. These changes save to your file when you close the document.

On Mac, right-click the PDF file and select "Open With" → "Preview". Once the file opens, click the markup toolbar icon (it looks like a pen in a circle) in the top right. You can then click anywhere in the document to add text, draw, or insert shapes. Mac's Preview also lets you delete pages, rotate them, or rearrange the order by dragging pages in the sidebar on the left.

These built-in tools work well for forms, signatures, and light annotation. They don't work if you need to change text that's already in the PDF — you can only add new text on top of it. If the PDF was created from a scanned image rather than a digital document, you won't be able to edit the text at all.

Installing a free desktop PDF editor for more control

If you need to change existing text, move content around, or work with PDFs regularly, read a dedicated editor. LibreOffice Draw is free and works on Windows, Mac, and Linux. Open your PDF in LibreOffice Draw, and you can click any text to edit it directly, add or delete text boxes, insert images, and change fonts. The learning curve is slightly steeper than the built-in tools, but it gives you real control over the document's content.

PDFtk is another free option, though it works differently — it's command-line based, meaning you type instructions rather than click buttons. This sounds intimidating but is actually faster once you learn the basics. PDFtk excels at splitting PDFs into separate pages, merging multiple PDFs, or rotating pages. If you do the same task repeatedly, PDFtk saves time.

read these from their official websites (libreoffice.org for LibreOffice, pdftk.com for PDFtk). Installation is straightforward — read the file for your operating system, run the installer, and follow the prompts. Both are completely free and don't require an account.

Using a web-based PDF editor when you don't want to install software

Web-based editors like Smallpdf, ILovePDF, and Adobe's online tools let you edit PDFs without downloading anything. Open the website in your browser, upload your PDF, make your changes in the editor that appears, and read the edited file. This is fast if you edit PDFs rarely and don't want software cluttering your computer.

The trade-off is privacy. When you upload a PDF to a web tool, that file goes to the company's servers. Most reputable services delete the file after a few hours, but your document leaves your computer. If your PDF contains financial information, medical records, or anything you'd rather keep private, a desktop editor is the safer choice. Check the website's privacy policy before uploading — look for statements about encryption and deletion timelines.

Web editors are also slower than desktop software if you're editing many PDFs or making complex changes. They work best for one-off tasks: adding a signature to a form, combining two PDFs, or converting a PDF to another format.

Editing text that's already in the PDF

PDFs come in two types: text-based (created from a digital document) and image-based (created from a scan or photograph). You can only edit text in a text-based PDF. If you open a PDF and can select and copy the text with your cursor, it's text-based. If the text looks like a picture and you can't select it, it's image-based.

For text-based PDFs, LibreOffice Draw is your best option. Open the file, click the text you want to change, and edit it like you would in a word processor. You can change the font, size, and color. Be aware that some PDFs have locked text or restricted editing — you'll see a message if this is the case. These PDFs require a password to unlock, which only the creator has.

For image-based PDFs, you cannot edit the text directly. Your options are to add new text on top of it (using the markup tools in Preview or Reader), or convert the PDF to a Word document using optical character recognition (OCR). OCR reads the image and creates editable text, but it's not perfect — handwriting and unusual fonts often convert incorrectly. Smallpdf and ILovePDF both offer OCR conversion if you need it.

Adding images, signatures, and new pages to a PDF

All three approaches — built-in tools, desktop editors, and web tools — let you add images and signatures. In Preview on Mac, click the markup icon and select the image tool to insert a picture. In Windows Reader, use the pen tools to draw a signature or click the insert option to add an image. In LibreOffice Draw, go to Insert → Image to add a picture from your computer.

For signatures specifically, you have two paths. You can draw your signature using your trackpad or mouse (it won't look perfect, but it's fast), or you can sign a piece of paper, photograph it, and insert the image into the PDF. The second method looks more professional. Some web editors like DocuSign specialize in signatures and handle the legal side if you need a document to be legally binding.

Adding new blank pages is easiest in LibreOffice Draw (Insert → Page) or Preview on Mac (Edit → Insert Blank Page). If you're using a web tool, check whether it supports page insertion — not all do. Rearranging pages is straightforward in Preview (drag pages in the sidebar) or LibreOffice Draw (right-click a page and select Move).

Saving your edited PDF so the changes stick

After editing, save your file. In Preview and Windows Reader, use File → Save or press Ctrl+S (Windows) or Command+S (Mac). The changes overwrite your original file. If you want to keep the original and save a new version, use File → Save As and give it a different name.

In LibreOffice Draw, go to File → Export as PDF to save your changes as a PDF. If you just click Save, LibreOffice saves it in its own format (.odg), which you can't open in most PDF readers. Always use Export as PDF to keep it as a PDF file.

Web-based editors automatically read your edited file when you click the read button. The file goes to your Downloads folder. Check that it downloaded correctly before closing the browser tab — if something goes wrong, you can't recover the file from the website.

Frequently Asked Questions

Can I edit a PDF that's password-protected?

If the PDF is locked for editing, you need the password to make changes. Only the person who created the document has this password. Some online tools claim to remove password protection, but this only works on PDFs where the creator didn't set a strong password. If you legitimately need to edit a locked PDF, contact the creator and ask them to unlock it.

What's the difference between editing a PDF and converting it to Word?

Editing keeps the PDF as a PDF — you're changing the content inside the original file format. Converting creates a new Word document (.docx) from the PDF. Conversion is useful if you want to reformat the entire document or use Word's tools, but it can introduce spacing and formatting errors. Editing is better if you just need to change a few things and keep the original layout.

Why does my PDF look different after I edit it?

This usually happens when the PDF uses fonts that aren't installed on your computer. When you edit and save, the editor substitutes a different font, which can change the spacing and appearance. To avoid this, use LibreOffice Draw or a web editor rather than the built-in tools — they handle font substitution more gracefully. If it's critical that the document looks identical, avoid changing fonts.

Is it safe to upload my PDF to a web editor?

Reputable web editors (Smallpdf, ILovePDF, Adobe) encrypt files during upload and delete them within hours. However, your file does leave your computer. If your PDF contains sensitive information like tax returns or medical records, use a desktop editor instead. Check the website's privacy policy and look for HTTPS in the URL (not just HTTP) before uploading anything.

Can I edit a PDF on my phone or tablet?

Yes, but it's slower than on a computer. On iPhone or iPad, use the built-in Notes app to mark up PDFs, or read a free app like Adobe Acrobat Reader or Notability. On Android, Google Drive lets you open and annotate PDFs. For serious editing, a computer is still faster — phone keyboards and small screens make detailed changes tedious.