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How does a dynamic QR code work?



Announcing the arrival of Valued Associate #679: Cesar Manara
Planned maintenance scheduled April 23, 2019 at 00:00UTC (8:00pm US/Eastern)QR Codes for Files on Google CodeWhy google code download page have a QR code?QR Code designed for print?If I acquire a USB QR/barcode scanner, can I set it to automatically launch a browser upon reading a URL?How to read QR-based vCard on Windows & Mac OS, with USB scanner?QR Codes Printing, but Not Printing Correctly - Any Ideas?What type of QR Code is generated by the Bing QR Code GeneratorWhat to do with a QR code from web.whatsapp.com?Adding a logo to QR Code using ImageMagickIs it possible to create a QR code using text?



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22















So there is this QR code that you apparently can always edit even after it has been printed. For example, see this website that offers dynamic QR codes:



Screenshot of an offer for a dynamic QR code.



For example: When you make a QR code for plain text how can an independent QR code scanner see the difference when I edit the content of the QR code? The QR code itself obviously stays the same because it's printed.










share|improve this question






























    22















    So there is this QR code that you apparently can always edit even after it has been printed. For example, see this website that offers dynamic QR codes:



    Screenshot of an offer for a dynamic QR code.



    For example: When you make a QR code for plain text how can an independent QR code scanner see the difference when I edit the content of the QR code? The QR code itself obviously stays the same because it's printed.










    share|improve this question


























      22












      22








      22


      5






      So there is this QR code that you apparently can always edit even after it has been printed. For example, see this website that offers dynamic QR codes:



      Screenshot of an offer for a dynamic QR code.



      For example: When you make a QR code for plain text how can an independent QR code scanner see the difference when I edit the content of the QR code? The QR code itself obviously stays the same because it's printed.










      share|improve this question
















      So there is this QR code that you apparently can always edit even after it has been printed. For example, see this website that offers dynamic QR codes:



      Screenshot of an offer for a dynamic QR code.



      For example: When you make a QR code for plain text how can an independent QR code scanner see the difference when I edit the content of the QR code? The QR code itself obviously stays the same because it's printed.







      qr-code






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited Apr 1 at 16:53









      JakeGould

      32.9k10100142




      32.9k10100142










      asked Apr 1 at 16:40









      Murat KaçiranMurat Kaçiran

      7251410




      7251410




















          3 Answers
          3






          active

          oldest

          votes


















          50














          A supposedly “dynamic” QR code is simply an alias to the final destination URL



          The concept of a dynamic QR code is based mainly in the world of QR codes being used for URLs and such. The QR code itself is always static.



          That site you link to doesn’t really explain it well, but it’s pretty simple: The QR code format is the same regardless of whether the the data is static or dynamic. But in the case of a dynamic QR code, the generated QR code is just a “middle man” of a short URL. As explained on QRStuff.com:





          • Static QR Code: The actual destination website URL is placed directly into the QR code and can’t be modified.


          • Dynamic QR Code: A short URL is placed into the QR code which then transparently re-directs the user to the intended destination website URL, with the short URL redirection destination URL able to be changed after the QR code has been created.



          So if you were to create a QR code to Google.com, a static QR code would directly encode the URL https://www.google.com/ but a dynamic QR code would assign https://www.google.com/ to a short URL like something like this: https://example.com/iuyd9871.



          That way the QR code always has that https://example.com/iuyd9871 URL embedded and (key point) what happens when one goes to that URL can be adjusted. So if you wanted that QR code to point to Bing, then you need to just adjust what that https://example.com/iuyd9871 will redirect to.



          So that said, the weakness of a dynamic QR code is it relies on a service that manages that short URL. If that service is down or disappears for some reason, then that “dynamic” QR code becomes dead and useless. A static QR code will always work as the URL is always embedded in the QR code itself.






          share|improve this answer
































            5














            Dynamic QR codes contain a short URL link, which links to the generator website. When following this URL you get redirected to the site that is registered against the short URL.
            Modifying the dynamic QR code doesn't actually modify the QR code itself, it just changes the redirection to get the user to visit a different site to the other one. This is done at the generator website.



            As an aside:



            I had a friend who edited QR codes manually while at Uni.



            A standard QR code has some level of error correction built in, so if the captured image isn't great, the encoded information can still be extracted. As long as any modification to said QR code remains little enough to not exceed the error handling capabilities, it will still work (though reliability of the read may be reduced).
            So while a non-dynamic QR code isn't editable, it kind-of is. To a degree.






            share|improve this answer


















            • 1





              Nitpick: you're not editing the signal (the URL that's encoded), you're making changes to the carrier medium (the QR code pixels) and hoping that error correction will compensate. (This is essentially the same as "put your logo in the middle of the picture, QR code remains readable)

              – Piskvor
              Apr 2 at 9:18











            • @Piskvor yes. though my representation was thinking about it purely in the visual transmission of the code from paper to camera, much like with digital tv, the pixels are the content you decode, but the signal is actually the radio-waves you are picking up with the antenna, and the noise being anything that degrades that.

              – Baldrickk
              Apr 2 at 13:02











            • Visual signal is still signal...this works the same way across the EM spectrum, whether you're transmitting 12 cm waves (wifi) or 500 nm (visible light). Light is the signal carrier, URL is the content.

              – Piskvor
              Apr 2 at 13:06


















            3














            Most likely it works like a pointer.



            Say this is actually what the QR code says



            https://www.example.com/askdfhaskj


            askdfhaskj is a pointer to a web page.



            The contents of that web page, askdfhaskj , can be manipulated at any time. Then the current contents of the page is displayed.



            Think of it like what bit.ly does.



            Of course the app doesn't show the link, and hides all the inner workings in the background.






            share|improve this answer

























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              3 Answers
              3






              active

              oldest

              votes








              3 Answers
              3






              active

              oldest

              votes









              active

              oldest

              votes






              active

              oldest

              votes









              50














              A supposedly “dynamic” QR code is simply an alias to the final destination URL



              The concept of a dynamic QR code is based mainly in the world of QR codes being used for URLs and such. The QR code itself is always static.



              That site you link to doesn’t really explain it well, but it’s pretty simple: The QR code format is the same regardless of whether the the data is static or dynamic. But in the case of a dynamic QR code, the generated QR code is just a “middle man” of a short URL. As explained on QRStuff.com:





              • Static QR Code: The actual destination website URL is placed directly into the QR code and can’t be modified.


              • Dynamic QR Code: A short URL is placed into the QR code which then transparently re-directs the user to the intended destination website URL, with the short URL redirection destination URL able to be changed after the QR code has been created.



              So if you were to create a QR code to Google.com, a static QR code would directly encode the URL https://www.google.com/ but a dynamic QR code would assign https://www.google.com/ to a short URL like something like this: https://example.com/iuyd9871.



              That way the QR code always has that https://example.com/iuyd9871 URL embedded and (key point) what happens when one goes to that URL can be adjusted. So if you wanted that QR code to point to Bing, then you need to just adjust what that https://example.com/iuyd9871 will redirect to.



              So that said, the weakness of a dynamic QR code is it relies on a service that manages that short URL. If that service is down or disappears for some reason, then that “dynamic” QR code becomes dead and useless. A static QR code will always work as the URL is always embedded in the QR code itself.






              share|improve this answer





























                50














                A supposedly “dynamic” QR code is simply an alias to the final destination URL



                The concept of a dynamic QR code is based mainly in the world of QR codes being used for URLs and such. The QR code itself is always static.



                That site you link to doesn’t really explain it well, but it’s pretty simple: The QR code format is the same regardless of whether the the data is static or dynamic. But in the case of a dynamic QR code, the generated QR code is just a “middle man” of a short URL. As explained on QRStuff.com:





                • Static QR Code: The actual destination website URL is placed directly into the QR code and can’t be modified.


                • Dynamic QR Code: A short URL is placed into the QR code which then transparently re-directs the user to the intended destination website URL, with the short URL redirection destination URL able to be changed after the QR code has been created.



                So if you were to create a QR code to Google.com, a static QR code would directly encode the URL https://www.google.com/ but a dynamic QR code would assign https://www.google.com/ to a short URL like something like this: https://example.com/iuyd9871.



                That way the QR code always has that https://example.com/iuyd9871 URL embedded and (key point) what happens when one goes to that URL can be adjusted. So if you wanted that QR code to point to Bing, then you need to just adjust what that https://example.com/iuyd9871 will redirect to.



                So that said, the weakness of a dynamic QR code is it relies on a service that manages that short URL. If that service is down or disappears for some reason, then that “dynamic” QR code becomes dead and useless. A static QR code will always work as the URL is always embedded in the QR code itself.






                share|improve this answer



























                  50












                  50








                  50







                  A supposedly “dynamic” QR code is simply an alias to the final destination URL



                  The concept of a dynamic QR code is based mainly in the world of QR codes being used for URLs and such. The QR code itself is always static.



                  That site you link to doesn’t really explain it well, but it’s pretty simple: The QR code format is the same regardless of whether the the data is static or dynamic. But in the case of a dynamic QR code, the generated QR code is just a “middle man” of a short URL. As explained on QRStuff.com:





                  • Static QR Code: The actual destination website URL is placed directly into the QR code and can’t be modified.


                  • Dynamic QR Code: A short URL is placed into the QR code which then transparently re-directs the user to the intended destination website URL, with the short URL redirection destination URL able to be changed after the QR code has been created.



                  So if you were to create a QR code to Google.com, a static QR code would directly encode the URL https://www.google.com/ but a dynamic QR code would assign https://www.google.com/ to a short URL like something like this: https://example.com/iuyd9871.



                  That way the QR code always has that https://example.com/iuyd9871 URL embedded and (key point) what happens when one goes to that URL can be adjusted. So if you wanted that QR code to point to Bing, then you need to just adjust what that https://example.com/iuyd9871 will redirect to.



                  So that said, the weakness of a dynamic QR code is it relies on a service that manages that short URL. If that service is down or disappears for some reason, then that “dynamic” QR code becomes dead and useless. A static QR code will always work as the URL is always embedded in the QR code itself.






                  share|improve this answer















                  A supposedly “dynamic” QR code is simply an alias to the final destination URL



                  The concept of a dynamic QR code is based mainly in the world of QR codes being used for URLs and such. The QR code itself is always static.



                  That site you link to doesn’t really explain it well, but it’s pretty simple: The QR code format is the same regardless of whether the the data is static or dynamic. But in the case of a dynamic QR code, the generated QR code is just a “middle man” of a short URL. As explained on QRStuff.com:





                  • Static QR Code: The actual destination website URL is placed directly into the QR code and can’t be modified.


                  • Dynamic QR Code: A short URL is placed into the QR code which then transparently re-directs the user to the intended destination website URL, with the short URL redirection destination URL able to be changed after the QR code has been created.



                  So if you were to create a QR code to Google.com, a static QR code would directly encode the URL https://www.google.com/ but a dynamic QR code would assign https://www.google.com/ to a short URL like something like this: https://example.com/iuyd9871.



                  That way the QR code always has that https://example.com/iuyd9871 URL embedded and (key point) what happens when one goes to that URL can be adjusted. So if you wanted that QR code to point to Bing, then you need to just adjust what that https://example.com/iuyd9871 will redirect to.



                  So that said, the weakness of a dynamic QR code is it relies on a service that manages that short URL. If that service is down or disappears for some reason, then that “dynamic” QR code becomes dead and useless. A static QR code will always work as the URL is always embedded in the QR code itself.







                  share|improve this answer














                  share|improve this answer



                  share|improve this answer








                  edited Apr 2 at 13:54

























                  answered Apr 1 at 16:51









                  JakeGouldJakeGould

                  32.9k10100142




                  32.9k10100142























                      5














                      Dynamic QR codes contain a short URL link, which links to the generator website. When following this URL you get redirected to the site that is registered against the short URL.
                      Modifying the dynamic QR code doesn't actually modify the QR code itself, it just changes the redirection to get the user to visit a different site to the other one. This is done at the generator website.



                      As an aside:



                      I had a friend who edited QR codes manually while at Uni.



                      A standard QR code has some level of error correction built in, so if the captured image isn't great, the encoded information can still be extracted. As long as any modification to said QR code remains little enough to not exceed the error handling capabilities, it will still work (though reliability of the read may be reduced).
                      So while a non-dynamic QR code isn't editable, it kind-of is. To a degree.






                      share|improve this answer


















                      • 1





                        Nitpick: you're not editing the signal (the URL that's encoded), you're making changes to the carrier medium (the QR code pixels) and hoping that error correction will compensate. (This is essentially the same as "put your logo in the middle of the picture, QR code remains readable)

                        – Piskvor
                        Apr 2 at 9:18











                      • @Piskvor yes. though my representation was thinking about it purely in the visual transmission of the code from paper to camera, much like with digital tv, the pixels are the content you decode, but the signal is actually the radio-waves you are picking up with the antenna, and the noise being anything that degrades that.

                        – Baldrickk
                        Apr 2 at 13:02











                      • Visual signal is still signal...this works the same way across the EM spectrum, whether you're transmitting 12 cm waves (wifi) or 500 nm (visible light). Light is the signal carrier, URL is the content.

                        – Piskvor
                        Apr 2 at 13:06















                      5














                      Dynamic QR codes contain a short URL link, which links to the generator website. When following this URL you get redirected to the site that is registered against the short URL.
                      Modifying the dynamic QR code doesn't actually modify the QR code itself, it just changes the redirection to get the user to visit a different site to the other one. This is done at the generator website.



                      As an aside:



                      I had a friend who edited QR codes manually while at Uni.



                      A standard QR code has some level of error correction built in, so if the captured image isn't great, the encoded information can still be extracted. As long as any modification to said QR code remains little enough to not exceed the error handling capabilities, it will still work (though reliability of the read may be reduced).
                      So while a non-dynamic QR code isn't editable, it kind-of is. To a degree.






                      share|improve this answer


















                      • 1





                        Nitpick: you're not editing the signal (the URL that's encoded), you're making changes to the carrier medium (the QR code pixels) and hoping that error correction will compensate. (This is essentially the same as "put your logo in the middle of the picture, QR code remains readable)

                        – Piskvor
                        Apr 2 at 9:18











                      • @Piskvor yes. though my representation was thinking about it purely in the visual transmission of the code from paper to camera, much like with digital tv, the pixels are the content you decode, but the signal is actually the radio-waves you are picking up with the antenna, and the noise being anything that degrades that.

                        – Baldrickk
                        Apr 2 at 13:02











                      • Visual signal is still signal...this works the same way across the EM spectrum, whether you're transmitting 12 cm waves (wifi) or 500 nm (visible light). Light is the signal carrier, URL is the content.

                        – Piskvor
                        Apr 2 at 13:06













                      5












                      5








                      5







                      Dynamic QR codes contain a short URL link, which links to the generator website. When following this URL you get redirected to the site that is registered against the short URL.
                      Modifying the dynamic QR code doesn't actually modify the QR code itself, it just changes the redirection to get the user to visit a different site to the other one. This is done at the generator website.



                      As an aside:



                      I had a friend who edited QR codes manually while at Uni.



                      A standard QR code has some level of error correction built in, so if the captured image isn't great, the encoded information can still be extracted. As long as any modification to said QR code remains little enough to not exceed the error handling capabilities, it will still work (though reliability of the read may be reduced).
                      So while a non-dynamic QR code isn't editable, it kind-of is. To a degree.






                      share|improve this answer













                      Dynamic QR codes contain a short URL link, which links to the generator website. When following this URL you get redirected to the site that is registered against the short URL.
                      Modifying the dynamic QR code doesn't actually modify the QR code itself, it just changes the redirection to get the user to visit a different site to the other one. This is done at the generator website.



                      As an aside:



                      I had a friend who edited QR codes manually while at Uni.



                      A standard QR code has some level of error correction built in, so if the captured image isn't great, the encoded information can still be extracted. As long as any modification to said QR code remains little enough to not exceed the error handling capabilities, it will still work (though reliability of the read may be reduced).
                      So while a non-dynamic QR code isn't editable, it kind-of is. To a degree.







                      share|improve this answer












                      share|improve this answer



                      share|improve this answer










                      answered Apr 1 at 16:49









                      BaldrickkBaldrickk

                      48028




                      48028







                      • 1





                        Nitpick: you're not editing the signal (the URL that's encoded), you're making changes to the carrier medium (the QR code pixels) and hoping that error correction will compensate. (This is essentially the same as "put your logo in the middle of the picture, QR code remains readable)

                        – Piskvor
                        Apr 2 at 9:18











                      • @Piskvor yes. though my representation was thinking about it purely in the visual transmission of the code from paper to camera, much like with digital tv, the pixels are the content you decode, but the signal is actually the radio-waves you are picking up with the antenna, and the noise being anything that degrades that.

                        – Baldrickk
                        Apr 2 at 13:02











                      • Visual signal is still signal...this works the same way across the EM spectrum, whether you're transmitting 12 cm waves (wifi) or 500 nm (visible light). Light is the signal carrier, URL is the content.

                        – Piskvor
                        Apr 2 at 13:06












                      • 1





                        Nitpick: you're not editing the signal (the URL that's encoded), you're making changes to the carrier medium (the QR code pixels) and hoping that error correction will compensate. (This is essentially the same as "put your logo in the middle of the picture, QR code remains readable)

                        – Piskvor
                        Apr 2 at 9:18











                      • @Piskvor yes. though my representation was thinking about it purely in the visual transmission of the code from paper to camera, much like with digital tv, the pixels are the content you decode, but the signal is actually the radio-waves you are picking up with the antenna, and the noise being anything that degrades that.

                        – Baldrickk
                        Apr 2 at 13:02











                      • Visual signal is still signal...this works the same way across the EM spectrum, whether you're transmitting 12 cm waves (wifi) or 500 nm (visible light). Light is the signal carrier, URL is the content.

                        – Piskvor
                        Apr 2 at 13:06







                      1




                      1





                      Nitpick: you're not editing the signal (the URL that's encoded), you're making changes to the carrier medium (the QR code pixels) and hoping that error correction will compensate. (This is essentially the same as "put your logo in the middle of the picture, QR code remains readable)

                      – Piskvor
                      Apr 2 at 9:18





                      Nitpick: you're not editing the signal (the URL that's encoded), you're making changes to the carrier medium (the QR code pixels) and hoping that error correction will compensate. (This is essentially the same as "put your logo in the middle of the picture, QR code remains readable)

                      – Piskvor
                      Apr 2 at 9:18













                      @Piskvor yes. though my representation was thinking about it purely in the visual transmission of the code from paper to camera, much like with digital tv, the pixels are the content you decode, but the signal is actually the radio-waves you are picking up with the antenna, and the noise being anything that degrades that.

                      – Baldrickk
                      Apr 2 at 13:02





                      @Piskvor yes. though my representation was thinking about it purely in the visual transmission of the code from paper to camera, much like with digital tv, the pixels are the content you decode, but the signal is actually the radio-waves you are picking up with the antenna, and the noise being anything that degrades that.

                      – Baldrickk
                      Apr 2 at 13:02













                      Visual signal is still signal...this works the same way across the EM spectrum, whether you're transmitting 12 cm waves (wifi) or 500 nm (visible light). Light is the signal carrier, URL is the content.

                      – Piskvor
                      Apr 2 at 13:06





                      Visual signal is still signal...this works the same way across the EM spectrum, whether you're transmitting 12 cm waves (wifi) or 500 nm (visible light). Light is the signal carrier, URL is the content.

                      – Piskvor
                      Apr 2 at 13:06











                      3














                      Most likely it works like a pointer.



                      Say this is actually what the QR code says



                      https://www.example.com/askdfhaskj


                      askdfhaskj is a pointer to a web page.



                      The contents of that web page, askdfhaskj , can be manipulated at any time. Then the current contents of the page is displayed.



                      Think of it like what bit.ly does.



                      Of course the app doesn't show the link, and hides all the inner workings in the background.






                      share|improve this answer





























                        3














                        Most likely it works like a pointer.



                        Say this is actually what the QR code says



                        https://www.example.com/askdfhaskj


                        askdfhaskj is a pointer to a web page.



                        The contents of that web page, askdfhaskj , can be manipulated at any time. Then the current contents of the page is displayed.



                        Think of it like what bit.ly does.



                        Of course the app doesn't show the link, and hides all the inner workings in the background.






                        share|improve this answer



























                          3












                          3








                          3







                          Most likely it works like a pointer.



                          Say this is actually what the QR code says



                          https://www.example.com/askdfhaskj


                          askdfhaskj is a pointer to a web page.



                          The contents of that web page, askdfhaskj , can be manipulated at any time. Then the current contents of the page is displayed.



                          Think of it like what bit.ly does.



                          Of course the app doesn't show the link, and hides all the inner workings in the background.






                          share|improve this answer















                          Most likely it works like a pointer.



                          Say this is actually what the QR code says



                          https://www.example.com/askdfhaskj


                          askdfhaskj is a pointer to a web page.



                          The contents of that web page, askdfhaskj , can be manipulated at any time. Then the current contents of the page is displayed.



                          Think of it like what bit.ly does.



                          Of course the app doesn't show the link, and hides all the inner workings in the background.







                          share|improve this answer














                          share|improve this answer



                          share|improve this answer








                          edited Apr 1 at 17:06









                          JakeGould

                          32.9k10100142




                          32.9k10100142










                          answered Apr 1 at 16:47









                          cybernardcybernard

                          10.6k31828




                          10.6k31828



























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