qr.html is a self contained website, that can generate QR codes via qr-creator. Because it is fully self-contained, you can just download the file and open it on any computer that has a browser installed, no internet connection is needed.

You can use it to exchange data with your phone, exfiltrate data from a VM, or whatever else you use QR codes for.

You can try out the live demo at qr.15c.me/qr.html.

At the top of the file are some variables that you can use to customize the QR code. You can also temporarily override these in your browser console:

QR_BORDER_COLOR="#ff0000"

Most variables can also be read from local storage, so you can permanently store settings while using the hosted version. To set a value, you execute something like the following in your browser's console:

localStorage.setItem("QR_BORDER_SIZE", "30")

If you have no direct channel to your target system (say you have a Citrix with no internet and clipboard & file upload disabled), you can use tiny-qr.html. It is a very basic QR code generator optimized for size, so that you can transfer it faster using keystroke emulation software (like xdotool type):

1. Opening a text editor on the target
2. (Optional) Trying different typing speeds to find the fastest speed at which the transfered contents are not corrupted
3. Tell the keystroke emulation software to type the contents of tiny-qr.html and wait for it to finish.
4. Save the editor's contents as a .html file
5. Open the file with a browser of your choice

tiny-qr.html differs from qr.html in the following ways:

• Very short error messages and use of popups instead of an dedicated error message field. No debugging data logged to the console
• No additional features such as drag and drop, clipboard watching, etc
• Simplified layout
• Use of short (mostly 1 letter) variable names, removed all comments
• When alternative syntaxes for something exist, using the shortest one
• The file is less than half the size (12938 bytes vs 29655 bytes at the time of writing)¹

You can try out the live demo at qr.15c.me/tiny-qr.html.

• QR code size limitation: A maximum of 2953 characters can be used with error correction level L, less if you choose better error correction.
• When opening qr.html using a file URL in chromium and enabling the clipboard monitoring, a permissions dialog is triggered every time the clipboard is read (every second).

For convenience I have implemented some additional features, that make it easier / faster to generate QR codes from the data you want. However, these features use APIs that not all browsers support. My tests were conducted on a Mac and/or Linux computer, Windows support may differ:

The idea is to watch the clipboard constantly (as far as allowed by the browser).

Use case: Allow using guest clipboard on host (via a script that parses QR code and puts its content's in the clipboard), when working with a VM, Citrix, or similar system where clipboard sharing may not work/be enabled.

Limits: Browsers only allow clipboard access when the specific tab and window are focused, browser support is terrible (probably since this is easy to abuse if the permission handling is not well implemented).

Copy a file from your OS file explorer and paste it into your browser to generate a QR code for the file's contents.

• You can provide an initial value for the textbox (and QR code) after a hashtag in the URL like this: https://qr.15c.me/qr.html#Hello,%20world!%F0%9F%8E%89
• You can now set values from the browser's console
• Added support for a border around the QR code
• Created a basic minified version (tiny-qr.html)
• Added drag & drop and file copy pasting support
• Added clipboard monitoring support. When the user enables the checkbox, the QR code is updated every time the clipboard changes. This feature can be completely disabled by modifying qr.html and setting SHOW_CLIPBOARD_MONITORING_CONTROLS to false.
• Changed QR code generator library from qrcodejs to qr-creator, because qrcodejs is no longer maintained, and has problems with Unicode. Even Zhi Yuan's better maintained fork still sometimes has the same problem.

• You can do whatever you want with my own code, since it is licensed under "The Unlicense".
• qr-creator is licensed under the MIT License (see https://github.com/nimiq/qr-creator)