The Viewer Hijack
Google Chrome features a robust built-in PDF viewer designed for quick reading. Occasionally, depending on your system configuration or if you accidentally selected a specific option in the past, Chrome might begin automatically opening every single PDF you download directly within a new browser tab, instead of saving it quietly to your Downloads folder. Conversely, if you installed a third-party application like Adobe Acrobat, Chrome might be configured to automatically launch that heavy desktop application every time a PDF download finishes. Both behaviors steal your focus and disrupt your browsing workflow when you simply wanted to save a file for later.
Resetting File Opening Preferences
To retain control over your downloads and stop Google Chrome from automatically opening PDF files the moment they finish downloading, you must clear your file-type auto-open preferences and adjust your site settings.
First, clear the auto-open trigger. Download any PDF file. When it appears in the download tray (either at the bottom of the screen or in the top-right download bubble), do not click the filename. Instead, click the small arrow (or right-click the file in the bubble) to open the context menu. If there is a checkmark next to Always open files of this type, click it to uncheck it. This stops the desktop application launch. Next, stop Chrome from rendering them internally. Click the three vertical dots in the top-right corner of the browser and select Settings. Go to Privacy and security > Site Settings > Additional content settings > PDF documents. Ensure the toggle for Download PDFs is turned On. Chrome will now silently save PDFs to your hard drive without interrupting you.