Knowledge Channels Technologies

Did a QR code bring you here?

The code you scanned may hold a hidden secret. Your scanner can read only its public content: this link. To see the secret, scan the same code with QRench.

Get QRench on Google Play
An Android app by KChannels

A QR code with a secret inside.

Plainly secret.

A QRench code is an ordinary QR code. Any scanner reads its public content — a link, a text or a contact — as usual. Only QRench finds the secret hidden inside the same QR code.

Any other scannerthe public content
QRench showing the same QR code: a secret, unlocked with its password, above the public link
QRenchthe secret too

One QR code, two audiences

This is a form of steganography: hiding information in plain sight. Share or print a QRench code like any other QR code.

Public content

A link, a text or a contact. Every scanner reads it, and every phone can open it.

The secret

Only QRench finds it. Lock it with a password, and only the people you give the password to can read it.

How it works

Create

Type the public content and a secret, or fill in a contact. Add a password if you want.

Share or print

Share or print the QR code like any other.

Scan with QRench

With the camera, from a picture, or by sharing a picture to QRench — and the secret appears.

Everyone else

sees only the public content.

Ideas

Everyone sees the public content. Only the people you choose see the secret.

Business card

Everyone: your work details.

The secret: your private mobile number, for the people you trust.

Event poster

Everyone: the event page.

The secret: the staff instructions for the team, behind a password.

Guest Wi-Fi poster

Everyone: the house rules.

The secret: the Wi-Fi password, for your guests.

Router sticker

Everyone: the manual's link.

The secret: the admin password for you, behind a password.

Greeting card or gift

Everyone: a greeting.

The secret: a private message for the person you give it to.

Treasure hunt

Everyone: a clue.

The secret: the answer, for the game master.

What's built in

Scanner

An everyday scanner

It reads every QR code and checks each one for a secret. Secret scan or Regular scan, with one tap; Regular scan reads barcodes too.

Pictures

Scan from anywhere

From the camera, from your gallery, or share a picture from any app — a screenshot, a picture in a chat.

Contacts

Business cards

Scan a contact QR code and tap a number to call. Add to contacts opens your phone's Contacts app with the details filled in — QRench never reads your contact list. Make your own in Create.

Share

Share to QRench

Share a link, a text or a contact to QRench from any app, and make a QR code from it.

AES-256-GCM

Lock a secret

Lock a secret with a password, with the key made on your phone. Without the password, nobody can read it.

Library

Your QR codes, kept

The QR codes you make and the ones you scan, on your phone, with two samples to try at once. Save QR code images to your gallery, or share them.

See it work

The QRench welcome screen with a sample QR code A QR code with a secret inside
A secret unlocked with its password, above the public link Lock a secret with a password
A scanned business card: the public contact, and a private mobile number as the secret Everyone sees your card. Only QRench sees your private number.
Create, with a contact form filled in Make your own business card
Create, with public text, a secret and a password Hide a secret in any QR code
A scanned QR code asking for the password before it shows the secret No password, no secret
The Library, with four QR codes and password filters Your QR codes stay on your phone
A QRench QR code with a hidden secret

Try it

Scan it with any other scanner: you see only the public link.
Scan it with QRench: you also see its secret.
On a phone? Long-press the image and share it to QRench.

Save image

Private by design

  • Your QR codes, secrets, pictures, and the text and contacts you share to QRench are read on your phone and never leave it.
  • No account, no ads, and no analytics of its own.
  • To read QR codes and barcodes, QRench uses Google's ML Kit, which sends Google usage statistics about the scanner — never your QR codes or pictures.
  • Android backup is off: your Library stays on your phone.
  • Links open only when you tap them, and the whole link shows first.
An honest note

A secret without a password is hidden, not private: anyone with QRench can read it. For anything personal, set a password and share it privately. If the password is lost, nobody can recover the secret. A damaged, small or poorly printed QR code may not give its secret.

Free, with no ads

Plainly secret.

Make and scan QR codes that hide a secret only QRench can read.