The printed pattern holds a short QR Cake link, not the file itself, so a small code can lead to a 100-page PDF or a full video. By default the link goes straight to the file: a PDF opens in the phone's PDF viewer, video and audio play in the browser's built-in player, and images display full-size. You can instead show a hosted page with your title, description, logo and colors around the file, and add password protection so scanners enter an access code first. On the free plan, each scan shows a short QR Cake page with a brief ad before the file opens.
Every code you save to a QR Cake account is dynamic: the link inside the pattern stays fixed while the file behind it can change. Replace a draft price list with the final version, swap last season's product video for the new one, or fix a typo in a menu PDF, and every copy already on paper opens the new file on the next scan. A static QR code that encodes a file's web address directly can't be changed once printed, and it breaks if that address ever moves.
QR Cake hosts four kinds of file: images, audio, video and PDF. It does not host ZIP archives, Word documents, Excel or CSV spreadsheets, PowerPoint decks, EPUB books or APK installers. To give one of those a QR code, upload it to Google Drive, Dropbox or OneDrive, set sharing to anyone with the link, and make a Website QR code with the share link; the cloud service then shows its own preview and download button. A Word, Excel or PowerPoint file can also be exported to PDF and uploaded here directly. For several files behind one code, share a folder or use a Link List QR code.