A QR code is a machine-readable pattern that encodes information, typically a URL. When scanned, the QR code directs the user to a specific web address. The key difference between static and dynamic QR codes lies in how the encoded URL behaves after scanning. A QR code always encodes a fixed URL, and it does not change. 

For example a QR code might lead to 

• https://mywebsite.com/homepage
• https://qr.ly/xyz
• https://popvideo.app/blog

In some cases the fixed URL is a "redirection" or "url forwarding" or "url shortening" service or an intermediary link. The url service typcially is a service which manages the final destination that the browser forwarded to.   

Some examples of url forwarding services are bit.ly and qrco.de

When a QR code points to one of these services it is called a dynamic QR code,  because the service (bit.ly or qrco.de or others) allows the owner of the url to change the final destination that the URL is forwarded to.

Static vs. Dynamic QR Codes

Static QR Codes

A static QR code contains a fixed URL is the final destination -  and that destination is not changed.. The QR code always points to the same URL, and it remains constant.  Even though the QR code itself is unchangeable, the content on the webpage it leads to can still be modified.

Key Points:

• Alls QR codes always encodes a fixed, unchangeable URL.
• The the URL does not direct the user to another location.
• Content at the destination URL can still be updated.

Risks

• Requires reprinting if URL changes
• Limited tracking / analytics

Dynamic QR Codes

A dynamic QR code still contains a fixed URL, but the URL points to an intermediary service that is redirects the user to a different final URL. This redirection allows for flexibility, as the destination URL can be updated without having to alter the QR code itself. It is important to note that the QR code itselft does not change or act as a forwarding service; it simply points to the URL which allows a user to manage the final URL - the redirection occurs at the server level.

Key Points:

• The QR code encodes a fixed URL that may redirect users to different final destinations.
• The final destination URL can be updated anytime if a redirection mechanism is in place.
• Useful for marketing campaigns, tracking analytics, and temporary content.

Risks

• Third party services fees
• Traffic limits
• Service disruptions or may direct to a 'payment' site if over limits

Does that mean if I have a static URL to my website I can add a Redirect from that page to another page.

Yes, if you own the URL encoded in the QR code, you can set up a redirect to forward users to a different final destination. This approach gives you the flexibility of dynamic QR codes without relying on external services. Many website hosting providers and domain management services offer URL forwarding options that allow you to update the redirection target as needed.

Benefits of controlling your URL:

• Full control over redirection without third-party dependencies.
• Ability to update the final destination anytime.
• Avoid potential service disruptions from external providers.

Can the content at my QR Code change?

Even though a static QR code’s URL is fixed, the content at the destination URL is a website / which may change like any other website.

How to Check the Destination of a QR Code Before Scanning

To ensure safety and understand where a QR code leads, users can check the destination URL before opening it using various methods:

Built-in Phone Features

• Camera App: Many modern smartphones show a preview of the link before opening - if you dont recognize the name - consider installing an app that allows you to view the full URL before you click to open it.
• Apple: Apps like "QR Code Reader by Scan" allow users to view the URL before visiting the website.
• Android: Apps such as "QR & Barcode Scanner" provide URL previews and security checks.