Hide an offer behind a single lock they crack to reveal it, commercial use, no watermark
Give customers a reason to engage. Hide a discount, a code, or a surprise behind a lock, print it as a QR code, and let them crack it to reveal the offer. Commercial use is allowed and Pro removes the watermark.
Try it now, no sign-up
Enter the current year to unlock the deal.
How it works
Lock your offer
Hide a discount code, a link, or a surprise behind a lock with a hint that fits your brand.
Print the QR code
Put the QR code on packaging, a flyer, a table tent, or an event badge.
They reveal it
Customers scan, crack the code, and unlock the offer, which turns a passive scan into engagement.
Hidden-offer ideas for marketing and events
Mystery discount
Hide a percentage off behind a lock so customers have to engage to find out how much they saved.
Event treasure
Place QR codes around a venue, each hiding a clue or a prize, to keep guests moving and engaged.
Packaging unlock
Print a QR code on the box that reveals a thank-you offer or a how-to once the customer cracks it.
Gated giveaway
Hide entry details behind a lock so only engaged customers reach the giveaway.
Simple, honest pricing
Start free. Unlock Pro once, keep it for life.
Free
0€ forever
- • Unlimited locks
- • 12 lock types
- • QR code + short link
- • No sign-up needed to crack it
Pro
$29 lifetime
- • Commercial use allowed and no watermark
- • No watermark
- • Commercial use allowed
- • Competition mode
- • Advanced statistics
- • Priority support
QR code reveal questions
Can I use this for commercial marketing?
Yes. Commercial use is allowed, and Pro removes the watermark, unlike free tiers that forbid commercial use. See gamified discount and hidden-offer ideas.
How do I hide an offer behind a QR code?
Create a lock, hide your offer or code behind it, and share the lock as a QR code. Customers scan and crack it to reveal the offer. Read QR code ideas to engage guests at an event.
Is there a watermark?
The free tier shows a small Lock Challenge watermark. Pro removes it for clean, branded campaigns.
Can I track engagement?
Yes. You can see attempts and reveals, and Pro adds advanced statistics.
Turn a passive scan into an engaged customer.
Hide your offer behind a lock, print the QR code, and let customers crack it to reveal the deal. Commercial use, no watermark on Pro. Create your campaign free.
Create your QR code reveal →