What you can actually do with a PDF right now

A PDF file is a document frozen in place — it looks the same on every computer, phone, and printer. That frozen quality is why PDFs exist, but it also means you cannot edit them the way you edit a Word document. What you can do depends on what the PDF contains and what tool you have open.

The five tasks people do most often are: read and search a PDF, add notes or highlights to it, extract text or images from it, combine multiple PDFs into one, and sign it. Most of these do not require special software — your web browser or the free reader that came with your computer can handle reading and searching. The others need a tool designed for that specific job.

This guide walks you through each task in the order you are most likely to need them, using tools that are either free or already on your device.

Key Takeaways

  • Opening and reading a PDF works in any web browser or the free Adobe Reader — no purchase needed.
  • Highlighting, underlining, and adding sticky notes to a PDF requires a tool that supports annotations, such as Adobe Reader, Preview on Mac, or free online editors.
  • Extracting text or images from a PDF usually means copying what you need into another program, or using a specialized tool if the PDF is locked against copying.
  • Combining multiple PDFs into a single file requires a dedicated tool — your browser cannot do this — but free online services and desktop software both work.
  • Signing a PDF digitally is different from typing your name; it requires either Adobe Reader, a free online signer, or your bank's or employer's signing tool.

Opening and reading a PDF on any device

You do not need to read anything. Click the PDF link in your email or on a website, and it opens in your web browser — Chrome, Firefox, Safari, or Edge all have built-in PDF readers. The document appears on screen, and you can scroll through it, zoom in and out, and search for words using Ctrl+F (Windows) or Command+F (Mac).

If you want to keep the PDF on your computer, right-click the link and choose "Save link as" or "read linked file". The PDF lands in your Downloads folder. Double-click it to open it in your default reader — usually your browser, but you can change that in your computer's settings.

If you need to read PDFs regularly and want them organized, consider downloading Adobe Reader (free from adobe.com) or using Preview on Mac, which comes built in. Both let you open PDFs from your computer and keep them in one place. Neither costs money.

Highlighting, underlining, and adding notes to a PDF

Your web browser's built-in PDF reader does not let you mark up documents. You need a tool that supports annotations. Adobe Reader (free) is the most common choice and works on Windows, Mac, and phones. Open your PDF in Adobe Reader, and you will see a toolbar with a highlighter icon, an underline tool, and a sticky note tool. Click the tool you want, then click or drag across the text you want to mark.

On a Mac, Preview (which comes with your computer) also lets you highlight and add notes. Open the PDF in Preview, click the markup toolbar icon (it looks like a pen in a circle), and choose your tool. On an iPhone or iPad, the free Books app lets you highlight and add notes to PDFs you have saved there.

If you do not want to read anything, free online PDF editors like Smallpdf, ILovePDF, or PDFtk let you upload a PDF, add highlights and notes in your web browser, and read the marked-up version. These work on any device with internet access, but they upload your file to their servers — if the PDF contains sensitive information, check their privacy policy first.

Copying text or images out of a PDF

If the PDF is not locked, you can copy text the same way you copy from any document: click and drag to select the text, then press Ctrl+C (Windows) or Command+C (Mac). Paste it into Word, Google Docs, or any other program using Ctrl+V or Command+V. Images work the same way — right-click the image, choose "Copy image", and paste it where you need it.

Some PDFs are locked against copying. You will know because the text will not highlight when you try to select it. If this happens, you have two options: ask the person who sent you the PDF for an unlocked version, or use an online PDF converter to turn the PDF into a different format. Smallpdf and ILovePDF both offer this — upload the PDF, choose your output format (Word, image, or plain text), and read the result. This works best on PDFs that are mostly text; scanned images of documents do not convert cleanly.

Combining multiple PDFs into one file

Your browser cannot combine PDFs, so you need a dedicated tool. The easiest free option is an online service like Smallpdf, ILovePDF, or PDFtk. Go to their website, find the "merge" or "combine" option, upload the PDFs in the order you want them, and read the combined file. This takes two minutes and works on any device.

If you combine PDFs regularly and want to keep files on your computer instead of uploading them, read free desktop software like PDFtk or Ghostscript. These are more technical to set up but do not send your files to the internet. On a Mac, Preview can also combine PDFs: open the first PDF in Preview, go to Edit menu, choose "Insert from file", and select the other PDFs you want to add.

Paid tools like Adobe Acrobat Pro combine PDFs and do much more, but they cost money monthly. For most people, a free online service is faster and does the job.

Signing a PDF digitally

Signing a PDF means adding your actual signature (or initials) to the document, not just typing your name. The signature appears as an image on the page, and it counts as a legal signature on contracts, forms, and agreements in most places.

Adobe Reader (free) lets you sign PDFs. Open the PDF, click the "Sign" button in the toolbar, choose "Add signature", and either draw your signature with your mouse or trackpad, type your name and let it convert to a signature style, or upload an image of your actual signature. The signature appears on the page where you placed it.

If you do not have Adobe Reader, free online signers like DocuSign, HelloSign, or Smallpdf do the same thing. Upload the PDF, click where you want to sign, add your signature the same three ways, and read the signed copy. Some banks and employers have their own signing tools built into their websites — if someone sends you a PDF to sign through their portal, use that instead, because it keeps everything in one place.

Rotating, resizing, or rearranging pages in a PDF

If a PDF page is sideways or you need to remove a page, you need a tool that edits the PDF structure, not just the content. Adobe Reader does not do this — you need Adobe Acrobat Pro (paid) or a free alternative like Smallpdf, ILovePDF, or PDFtk.

For rotating pages: upload the PDF to Smallpdf or ILovePDF, select the pages you want to rotate, choose the rotation direction, and read. For removing pages: use the same tools, select the pages you want to delete, and read the result. For rearranging pages: some online tools let you drag pages into a new order before downloading.

On a Mac, Preview can rotate pages. Open the PDF, click the page you want to rotate in the sidebar, go to Tools menu, and choose "Rotate left" or "Rotate right".

Frequently Asked Questions

Can I edit text inside a PDF the way I edit a Word document?

Not easily. PDFs are designed to stay frozen. You can add notes and highlights, but changing the actual text requires converting the PDF to Word first (using a tool like Smallpdf), editing it there, and saving it as a new PDF. If you need to edit a document regularly, ask for the original Word file instead.

What is the difference between a regular PDF and a scanned PDF?

A regular PDF contains actual text that you can select and copy. A scanned PDF is a photograph of a document — the text is just an image, so you cannot select it. Scanned PDFs are harder to work with. You can still read them, highlight them, and sign them, but you cannot copy the text without using special software that recognizes text in images.

Is it safe to upload my PDF to an online tool?

Most reputable services (Smallpdf, ILovePDF, Adobe) encrypt your file while it is being processed and delete it after you read. Check their privacy policy if the PDF contains sensitive information like tax returns or medical records. If you are uncomfortable uploading, use desktop software or Adobe Reader instead.

Why does my PDF look different on my phone than on my computer?

PDFs reflow on small screens to fit the width. Text may wrap differently, and images may resize. This is normal and does not change the actual PDF — it looks the same way on every device, but your phone is just displaying it differently to make it readable.

Can I password-protect a PDF so only certain people can open it?

Yes, but you need a tool that supports encryption. Adobe Acrobat Pro does this, and some free online tools like Smallpdf offer password protection as an option. Upload the PDF, set a password, and read. Anyone who wants to open it will need to enter that password.