How to Convert an Image to PDF on Mac Without Extra Software

Whether you need to submit a photograph of a receipt for expenses, upload a scan of your ID card to a government portal, or combine several JPEG images into a single digital portfolio, you will frequently be asked to provide those files in PDF format. Unfortunately, a standard image file (like a JPEG, PNG, or HEIC) is rarely accepted by these strict online forms.

Many users instantly search Google for an “Image to PDF converter.” This is a terrible idea. Uploading your personal documents to sketchy free websites puts your private data at massive risk, and purchasing a premium subscription to Adobe Acrobat is completely unnecessary. Instead, you can learn how to convert an image to PDF on Mac using a powerful, hidden feature built directly into the operating system.

Converting a Single Image to PDF

If you only have one photo (such as a single screenshot or a picture of a receipt) that needs to be converted, the process takes less than ten seconds using the native macOS Preview application.

1. Locate your image file in Finder.
2. Double-click the image. Unless you have changed your default settings, it will automatically open in the Preview app.
3. In the very top menu bar of your Mac screen, click on File.
4. Scroll down the menu and select Export as PDF….
5. A save dialogue box will appear. Type a name for your new PDF document in the Save As field.
6. Choose where you want the file saved (such as your Desktop or Documents folder).
7. Click Save.

Your Mac has now generated a perfect, lightweight PDF copy of your image, completely offline and securely.

Combining Multiple Images into a Single PDF

The true power of the Preview app is its ability to stitch several different image files together into one multi-page PDF document. This is incredibly useful if you took photos of a three-page contract using your iPhone and need to email them as a single file.

1. Open a Finder window and select all the images you want to combine. (You can hold the Command key while clicking to select multiple files at once).
2. Right-click any of the selected images, hover over Open With, and choose Preview.
3. All of your images will open in a single Preview window, with a sidebar on the left showing thumbnails of each file. If you do not see the sidebar, click the View Menu icon in the top left corner of the window and select Thumbnails.
4. In the left sidebar, you can click and drag the image thumbnails up or down to rearrange their order. The top thumbnail will be page 1 of your PDF, the second will be page 2, and so on.
5. Once they are perfectly ordered, click on any thumbnail in the sidebar, then press Command + A on your keyboard to select all of them. (They will all turn grey to show they are selected).
6. In the top menu bar, click File.
7. Do not click “Export as PDF” this time. Instead, click Print… (or press Command + P).

The Hidden PDF Print Menu

You are not actually going to print the document onto physical paper; you are going to use the macOS print spooler to generate the final file.

1. In the Print menu that appears, look at the very bottom of the window. You will see a small drop-down menu labelled PDF.
2. Click that drop-down menu and select Save as PDF.
3. A save dialogue box will appear. Give your new multi-page document a title.
4. Click Save.

You now have a single, professional PDF document containing all of your images in the exact order you specified, completely free of charge and without ever installing third-party software.