Google Drive and Dropbox are two of the most popular places to store a PDF, and both work well as the home for a QR code's document, as long as you get the sharing right. Here's how to link a code to a PDF in either service so it opens for everyone.
Google Drive
Upload the PDF, open its share settings, and set general access to "anyone with the link" as a viewer. Copy the link. This public setting is essential, without it, scanners are blocked by an access-request screen instead of seeing your PDF.
Dropbox
Upload the PDF and create a shared link. Dropbox links can open a preview page; if you want the file to display or download more directly, you can adjust the link format. Confirm the shared link works without requiring a Dropbox login.
Generate and Test
Paste your chosen link into a PDF QR generator. Then scan the resulting code with a phone that isn't signed into your Drive or Dropbox account, this is the true test of whether your audience can open it.
Consider Dynamic for Stability
Cloud links can change if you move or re-upload the file. If you anticipate that, a dynamic code lets you repoint to the new link without remaking the code, protecting any printed materials from breaking.
FAQ
Common questions are answered in the FAQ section below.