Before you print
How big should it be?
Rule of thumb: printed width ≥ scanning distance ÷ 10. Pick the surface above and the studio sizes the code for you, then checks the printed module size against what a press can actually hold.
Questions people actually ask
No — UseQR encodes a link, not the file. Host the PDF anywhere public (your website, Google Drive, Dropbox) and paste the sharing link. If you use Drive or Dropbox, make sure the link is set to 'anyone with the link can view'.
No — QR codes hold at most about 3 KB, and even a one-page PDF is far larger. Linking to a hosted file is the standard approach, and it means you can fix a typo in the PDF without reprinting anything.
If the new file lives at the same link, every printed code keeps working and opens the new version. If the link changes, a static code needs reprinting — so prefer hosting that keeps a stable address.
Yes. Scanning opens the link in the phone's browser, and every modern phone renders PDFs natively — though a mobile-friendly web page is often nicer to read than a print-layout PDF.
Want the detail? How pdf link QR codes work — the payload format, what scanners do with it, and where it breaks.