The fastest way depends on what you already have open

If you have a document open in Word, Google Docs, or most other programs, you can save it as a PDF without installing anything new. On Windows, use File > Save As and pick PDF from the format dropdown. On Mac, use File > Export As > PDF. In Google Docs, go to File > read > PDF Document. These built-in options work for nearly every document you'll create, and the PDF keeps your formatting intact when you send it to someone else.

If you need to convert a document that's already saved in another format—like a Word file sitting on your desktop—you have three routes: use the program it was created in, use free online converters, or use your operating system's built-in tools. Each has a different speed and privacy tradeoff, which matters if you're working with sensitive documents.

Key Takeaways

  • Most programs let you save directly as PDF through File > Save As or File > Export, which is faster and more private than uploading to a website.
  • Google Docs, Microsoft Word, and LibreOffice all have PDF export built in—you do not need separate software.
  • Free online converters like Smallpdf and ILovePDF work from any device but send your document to their servers, which matters if the file contains sensitive information.
  • Windows 10 and 11 can print any document to PDF using the built-in Microsoft Print to PDF printer, without opening the original program.
  • Mac users can export to PDF directly from the print dialog in almost any process.

Converting from Word, Google Docs, or LibreOffice

If the document is open in Microsoft Word, click File in the top left, then Save As. Choose a location on your computer, type a filename, and click the dropdown that says "Save as type" (or "Format" on Mac). Select PDF from the list and click Save. Word will convert the document and save it as a PDF file in that location.

In Google Docs, open the document, click File at the top, hover over read, and click PDF Document. Your browser will read the PDF to your Downloads folder. This works the same way whether you're on Windows, Mac, or Linux, because Google Docs runs in your web browser.

LibreOffice (the free alternative to Word) works like Word: File > Export as PDF, choose where to save it, and click Export. The PDF will preserve your fonts, images, and page layout. If you do not have any of these programs installed, you can read LibreOffice for free from libreoffice.org, and it handles Word files, Google Docs exports, and many other formats.

Using Windows Print to PDF without the original program

If you have a document file but the program that created it is not installed, Windows 10 and 11 have a built-in printer called Microsoft Print to PDF. Right-click the document file, select Open with, and choose Notepad or WordPad (or any text editor). Once it opens, press Ctrl+P to print. In the printer dropdown, select Microsoft Print to PDF, then click Print. Windows will ask where to save the PDF and what to name it.

This method works for most document types, though the formatting may not be perfect if the original file was complex. For straightforward text documents, Word files, and PDFs you want to combine or edit, it is reliable and keeps everything on your computer—nothing uploads to the internet.

Using Mac's built-in PDF export from print

On Mac, open the document in any program, then press Command+P to open the print dialog. In the bottom left, you will see a dropdown that says PDF. Click it and select Save as PDF. Choose a location and filename, then click Save. This works in nearly every Mac process, from Mail to Preview to web browsers.

If you want to combine multiple documents into one PDF, use the Preview app. Open Preview, go to File > Open, select all the documents you want to combine (hold Command and click each one), then go to File > Print. In the print dialog, select Save as PDF and choose your location. Preview will merge them in the order you selected them.

Online converters when you need to work from any device

Services like Smallpdf, ILovePDF, and CloudConvert let you upload a document and read it as a PDF without installing software. Go to the website, click Upload or Choose File, select your document, wait for the conversion, and read the result. These work on any device—phone, tablet, or computer—and handle dozens of file types including Word, Excel, PowerPoint, and images.

The tradeoff is privacy: your document travels to their servers during conversion. If the file contains passwords, financial information, medical records, or anything you would not want on someone else's computer, use the offline methods instead (saving from Word, using Print to PDF, or exporting from Google Docs). Most online converters delete files after a few hours, but you cannot be certain, and some free services may use your documents to train AI models.

If you use an online converter, check whether the website offers a paid plan with encryption or deletion guarantees. Smallpdf and ILovePDF both offer paid versions that promise automatic deletion and encrypted uploads, though the free versions work fine for non-sensitive documents.

Combining multiple documents into one PDF

On Windows, use Print to PDF with multiple files: open each document, print it to PDF with a temporary name, then use an online tool or free software like PDFtk to combine them. Alternatively, if all the documents are in Word, create one master document, insert each file as a section (Insert > Object > Text from File), then save the whole thing as PDF.

On Mac, Preview handles this natively. Open Preview, go to File > Open, select all documents while holding Command, and they will open in one window as separate pages. Go to File > Print, select Save as PDF, and the entire combined document will save as one file.

If you need more control—reordering pages, removing pages, or adding watermarks—use a free online tool like Smallpdf's merge feature or read free software like PDFtk Server (Windows and Mac). These let you arrange pages and combine files without uploading to the internet.

Fixing formatting problems when the PDF does not look right

If your PDF looks different from the original document—text wrapping strangely, images in the wrong place, or fonts changed—the problem usually happens during conversion, not after. Try these fixes in order: first, save from the original program instead of using Print to PDF or an online converter. Second, if the document has complex formatting, open it in the program it was created in (Word for .docx files, Google Docs for Google files) and export from there. Third, check that all fonts are embedded: in Word, go to File > Options > Advanced, scroll to Printing Options, and check "Print fonts with the document."

If the PDF still looks wrong, the document itself may have formatting that does not convert cleanly. Simplify it by removing unusual fonts, reducing the number of columns, or breaking it into smaller sections. Then try converting again. For documents you plan to convert often, use standard fonts like Arial, Calibri, or Times New Roman, which convert reliably across all methods.

Frequently Asked Questions

Can I convert a scanned image or photo to PDF?

Yes. On Windows, right-click the image file, select Open with, choose Paint or Photos, press Ctrl+P, select Microsoft Print to PDF, and save. On Mac, open the image in Preview, press Command+P, select Save as PDF. Online tools like Smallpdf also accept image files and will convert them to PDF in seconds.

What if the PDF file is too large to email?

Compress it using an online tool like Smallpdf's compress feature, or use free software like 7-Zip (Windows) or Archive Utility (Mac) to create a compressed folder. Most email providers allow attachments up to 25 MB; if your PDF is larger, compress it first or use a file-sharing service like Google Drive or Dropbox instead of email.

Can I edit a PDF after I create it?

Yes, but it depends on the PDF. If you created it from Word or Google Docs, you can edit the original document and export again. If you need to edit the PDF itself, use free tools like PDFtk, Smallpdf's edit feature, or paid software like Adobe Acrobat. For straightforward changes like adding text or highlighting, Preview on Mac and Microsoft Edge on Windows both have built-in PDF editing.

Is it safe to use free online PDF converters?

Free online converters are safe for non-sensitive documents like resumes, articles, or presentations. For documents containing passwords, financial data, or medical information, use offline methods instead—save from Word, use Print to PDF, or export from Google Docs. These keep your file on your computer and do not send it to anyone else's servers.

Why does my PDF look different on someone else's computer?

PDFs can display differently depending on the PDF reader, screen size, and operating system. To may support consistency, embed all fonts when you export: in Word, go to File > Options > Advanced > Printing Options and check "Print fonts with the document." On Mac and in Google Docs, fonts are usually embedded automatically. Test the PDF on another device before sending it to important recipients.