Events & booths
One code on the counter replaces stacks of handouts. After the event you can expire or tighten access.
MaiPDF · QR for offline PDF
PDF → QR code: built for posters, shelves, and trade shows
Links are great in chat and email. QR codes are for physical touchpoints—someone scans and opens the PDF in the browser without installing an app or receiving a heavy attachment.
Offline-first
Same link + QR
Replace file later
Four offline scenarios that fit QR best
Posters & flyers
Keep the poster clean; put detail behind the scan. Update the PDF without reprinting the code.
Retail & front desk
Menus, price lists, policies—customers scan while waiting. No file transfer friction.
Packaging
Manuals and compliance PDFs on the box. Refresh content in the portal; the printed code stays valid.
How big to print, how far people scan
| Surface | Approx. size | Typical distance | Tip |
|---|---|---|---|
| Business card | 2 × 2 cm | 10–15 cm | High contrast, quiet background |
| Flyer / A4 | 3 × 3 cm | 15–25 cm | Keep away from folds |
| Poster / standee | ≥ 5 × 5 cm | 30–80 cm | Place within easy arm reach |
| Wall / large board | ≥ 8 × 8 cm | 50–150 cm | Test with a phone before mass print |
Rule of thumb: QR side length ≈ one tenth of the farthest comfortable scan distance. Always do a real-device test before a big print run.
After it is printed: what you can still measure
Open counts
See how often the link behind the code was opened—useful for comparing placements or campaigns.
Split by entry
Use separate links for Store A vs Store B or poster vs packaging to compare performance fairly.
FAQ
Does the QR change when I replace the PDF?
No. Replace the file in the control panel; the URL and QR image stay the same.
How long does the code work?
By default until you set an expiration or revoke access. Configure that in the sharing step.
Will it open inside WeChat / mobile browsers?
Yes—recipients open in the in-app browser. No extra app install is required for viewing.
English product note
Access control uses email verification (allowlisted addresses only). Read alerts can go to Telegram on the English flow—see the product page.