What a PDF is and why you might want one

A PDF (Portable Document Format) is a file type that looks the same on any computer, phone, or printer. When you save something as a PDF, the fonts, spacing, images, and layout stay exactly as you designed them — whether someone opens it on Windows, Mac, an iPhone, or a ten-year-old printer. That's why PDFs are standard for contracts, tax forms, resumes, and anything you need to send to someone else and have look identical on their end.

You probably already have a PDF reader on your device. Windows and Mac both open PDFs in their built-in apps. The main reason to create a PDF is to lock down how a document looks before you share it, or to combine multiple files into one, or to make sure someone cannot easily edit what you've written.

Key Takeaways

  • The fastest way to make a PDF is to open your document in Word, Google Docs, or any program with a Print option, then choose "Save as PDF" instead of printing to paper.
  • On Windows, use the built-in Print to PDF feature; on Mac, the Print dialog has a PDF button in the bottom left corner.
  • If you need to convert an image, scan, or web page, online converters like Smallpdf or ILovePDF work without installing software, though you should avoid uploading sensitive documents to unknown websites.
  • Most PDF readers let you view and print PDFs, but editing requires either the original file or a tool like Adobe Acrobat or free alternatives such as PDFtk.

Converting a Word document or Google Doc to PDF

If you already have a document open in Microsoft Word or Google Docs, the PDF conversion takes one or two clicks. Open the document you want to convert, then look for the File menu at the top left of your screen.

In Microsoft Word, click File, then select "Save As." A dialog box opens. On the left side, choose where you want to save the file — your Desktop or Documents folder works fine. At the bottom of the dialog, you'll see a dropdown that says "Save as type:" and currently shows "Word Document (.docx)". Click that dropdown and scroll down until you see "PDF (.pdf)", then click it. Type a name for your file and click Save. Word converts the document and stores it as a PDF in the location you chose.

In Google Docs, click File, then hover over "Download" and a submenu appears. Click "PDF Document (.pdf)". Your browser downloads the PDF to your Downloads folder — usually the same place web downloads go. You can then move it to Desktop or Documents if you prefer.

Using Windows Print to PDF

If you're working in a program that doesn't have a "Save as PDF" option — like Notepad, a web page, or an older application — Windows has a built-in PDF printer. Open the document you want to convert, then press Ctrl + P on your keyboard to open the Print dialog.

At the top of the Print dialog, you'll see a dropdown that says "Printer" and shows your default printer name. Click that dropdown and look for an option called "Microsoft Print to PDF" or just "Print to PDF". Select it. Now instead of sending your document to a physical printer, Windows will save it as a PDF file. Click the "Print" button, choose where you want to save the file, give it a name, and click Save.

This method works for almost anything you can see on screen — web pages, emails, scanned documents, or text files. The layout and formatting stay the same as what you see.

Using Mac's built-in PDF option

On a Mac, the process is similar but slightly different. Open the document or web page you want to convert, then press Command + P to open the Print dialog. In the bottom left corner of the Print dialog, you'll see a dropdown button labeled "PDF". Click it and a menu appears with several options.

Select "Save as PDF" from that menu. A save dialog opens. Choose a location for your file — Desktop or Documents are standard — type a name, and click Save. Mac converts the document to a PDF and stores it in the location you chose. You can also choose "Save as PostScript" or email the PDF directly from this menu, though "Save as PDF" is the most common choice.

Converting images and scanned documents to PDF

If you have a photo, screenshot, or scanned document that you want to turn into a PDF, you have two main routes: use an online converter, or use your computer's built-in tools.

For a single image, the simplest method on Windows is to right-click the image file, select "Open with," and choose "Microsoft Edge" or another web browser. Once the image is open in the browser, press Ctrl + P to print, select "Print to PDF," and save it. On Mac, open the image in Preview (the default image viewer), click File, then "Export As," change the file format dropdown to PDF, and click Save.

If you have multiple images or scanned pages you want to combine into one PDF, an online converter like Smallpdf, ILovePDF, or PDF Candy can do this without installing software. Go to the website, click the option to upload images or combine files, select your files, and download the resulting PDF. Be cautious with sensitive documents — only use converters from companies you recognize, and check whether they delete files after conversion. If you're converting tax returns, medical records, or financial documents, consider using your computer's built-in tools instead, since those files never leave your device.

Combining multiple documents into one PDF

If you need to merge several Word documents, images, or existing PDFs into a single file, online tools like Smallpdf or ILovePDF have a "merge" or "combine" feature. Upload your files in the order you want them, and the tool creates one PDF with all pages in sequence.

On Windows, you can also use a free program called PDFtk (available at pdftk.com), which lets you combine, split, and edit PDFs from your computer without uploading files to the internet. Download and install it, then right-click any PDF file and look for a PDFtk option in the context menu. On Mac, Preview can combine PDFs — open the first PDF in Preview, click Edit, then "Insert Page from File," and select the other PDFs you want to add.

For most people, an online tool is faster and requires no installation. For sensitive documents, using your computer's built-in tools keeps everything on your device.

Editing a PDF after you create it

Once you've saved something as a PDF, editing it is harder than editing the original document. Most PDF readers — like the one built into Windows and Mac — let you view and print PDFs but not change the text or images inside.

If you need to make changes, your best option is to go back to the original file. If you created the PDF from a Word document, edit the Word file and save it as a PDF again. If you need to edit a PDF directly and don't have the original, free tools like PDFtk, Sejda, or LibreOffice Draw can add text boxes, highlight sections, or make simple edits. Adobe Acrobat Pro is the professional standard for PDF editing but costs money. For most everyday use, going back to the original document and re-saving it as a PDF is simpler and faster.

Frequently Asked Questions

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

Yes. Adobe Acrobat Pro has built-in password protection, but free alternatives like PDFtk or online tools such as Smallpdf can add password protection without cost. Open the tool, upload your PDF, set a password, and download the protected version. Anyone who tries to open it will need to enter the password first.

Why does my PDF look different after I save it?

Fonts, margins, and page breaks sometimes shift when converting to PDF, especially if the original document uses uncommon fonts or complex formatting. Preview the PDF before sharing it. If the layout is wrong, go back to the original document, adjust the formatting, and save as PDF again. Narrower margins and simpler fonts usually convert more reliably.

What's the difference between saving as PDF and printing to PDF?

Saving as PDF (File > Save As > PDF) works in programs that support it and preserves the document structure. Printing to PDF (Ctrl + P > Print to PDF) works in any program and converts what you see on screen, but may lose some formatting. For documents, Save As is better; for web pages or programs without PDF support, Print to PDF is your only option.

Can I convert a PDF back to a Word document?

Online converters like Smallpdf or ILovePDF can convert a PDF to a Word file, but the result is usually messy — text boxes become separate paragraphs, images may shift, and formatting breaks. If you have the original Word document, use that instead. If you only have the PDF and need to edit it heavily, it's often faster to retype or reformat it in Word than to fix a converted file.

Is it safe to use online PDF converters?

Established converters like Smallpdf, ILovePDF, and PDF Candy are generally safe for non-sensitive documents. However, your files are uploaded to their servers, so avoid using them for tax returns, medical records, bank statements, or anything with personal information. For sensitive documents, use your computer's built-in PDF tools — Windows Print to PDF, Mac Preview, or Word's Save As PDF — which keep everything on your device.