Frequently asked questions
Everything you need to know about hidden QR shirts.
Will any QR scanner actually be able to read the hidden QR code?
Yes. We use high error-correction level (H) QR codes, which can be read even when up to 30% of the pattern is obscured. Combined with Stable Diffusion ControlNet, the QR code's underlying structure is preserved while the visual appearance is transformed into artwork. We've tested with iPhone, Android, and third-party scanners.
How does the AI hide the QR code?
We use a Stable Diffusion ControlNet model trained specifically for QR code steganography. Your QR code acts as a structural "control" signal — the AI generates artwork that matches the composition while keeping the QR code scannable. It's the same technique that went viral on social media in 2023.
What URL should I use for my QR code?
Anything! LinkedIn profiles and portfolios are most popular for conference networking. You can also use Linktree/Beacons if you want to share multiple links, a personal website, your company's site, a calendar booking link (Cal.com, Calendly), or even a WhatsApp contact link.
Can I change my URL after ordering?
Unfortunately no — the QR code and artwork are generated for a specific URL and cannot be changed after printing. Make sure the URL is live and won't move. We recommend using a Linktree or your own domain so you can update what it points to later.
How long does shipping take?
Shirts are printed on-demand and typically take 2–3 business days in production, then 3–5 days for shipping in the US. International shipping adds 3–7 days. Rush production is available — contact us if you have an upcoming conference.
What's the shirt quality like?
We print on Bella+Canvas 3001 unisex tees — widely considered the gold standard for POD shirts. They're 100% combed ringspun cotton, pre-shrunk, and have a modern unisex fit. Available in XS through 2XL.
Do you offer bulk discounts for conference booth orders?
Yes. 5+ shirts get $29.99/ea, 10+ get $24.99/ea. For larger orders (25+) or custom team designs where each shirt has a different QR code, contact us for a custom quote.
Can each shirt in a bulk order have a different QR code?
Currently each order has one QR code/design. For individual QR codes per person, place individual orders or contact us — we can support multi-QR bulk orders for teams.
What's your return policy?
Since every shirt is custom-printed, we can't accept returns for sizing. We will reprint or refund if there's a defect in print quality or the QR code doesn't scan. Check our size guide carefully before ordering.