Is it possible to create a QR code using text?





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106















QR codes I have seen are mostly image files. But can you create QR codes using plain text?



For example ASCII and UTF-8 have black boxes as characters. Can I use those together with spaces to create a QR code?










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Murat Kaçiran is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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  • 7





    Is there a specific project this is for? I'm just curious

    – Ben Leggiero
    Apr 2 at 3:35






  • 5





    @BenLeggiero Thank you for your question. I don't have a certain project but I thought it would be handy to know the existence of such QR codes. For example, you can put those in a bio on a forum if the forum doesn't support profile pictures, and many more advantages.

    – Murat Kaçiran
    Apr 2 at 10:19











  • At a small enough font size, you don't even need the black boxes!

    – Paul D. Waite
    Apr 3 at 16:27


















106















QR codes I have seen are mostly image files. But can you create QR codes using plain text?



For example ASCII and UTF-8 have black boxes as characters. Can I use those together with spaces to create a QR code?










share|improve this question









New contributor




Murat Kaçiran is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
















  • 7





    Is there a specific project this is for? I'm just curious

    – Ben Leggiero
    Apr 2 at 3:35






  • 5





    @BenLeggiero Thank you for your question. I don't have a certain project but I thought it would be handy to know the existence of such QR codes. For example, you can put those in a bio on a forum if the forum doesn't support profile pictures, and many more advantages.

    – Murat Kaçiran
    Apr 2 at 10:19











  • At a small enough font size, you don't even need the black boxes!

    – Paul D. Waite
    Apr 3 at 16:27














106












106








106


28






QR codes I have seen are mostly image files. But can you create QR codes using plain text?



For example ASCII and UTF-8 have black boxes as characters. Can I use those together with spaces to create a QR code?










share|improve this question









New contributor




Murat Kaçiran is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.












QR codes I have seen are mostly image files. But can you create QR codes using plain text?



For example ASCII and UTF-8 have black boxes as characters. Can I use those together with spaces to create a QR code?







utf-8 ascii qr-code






share|improve this question









New contributor




Murat Kaçiran is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











share|improve this question









New contributor




Murat Kaçiran is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









share|improve this question




share|improve this question








edited Apr 1 at 14:59









JakeGould

32.7k10100142




32.7k10100142






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Murat Kaçiran is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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asked Apr 1 at 14:32









Murat KaçiranMurat Kaçiran

7001410




7001410




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Murat Kaçiran is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.





New contributor





Murat Kaçiran is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.






Murat Kaçiran is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.








  • 7





    Is there a specific project this is for? I'm just curious

    – Ben Leggiero
    Apr 2 at 3:35






  • 5





    @BenLeggiero Thank you for your question. I don't have a certain project but I thought it would be handy to know the existence of such QR codes. For example, you can put those in a bio on a forum if the forum doesn't support profile pictures, and many more advantages.

    – Murat Kaçiran
    Apr 2 at 10:19











  • At a small enough font size, you don't even need the black boxes!

    – Paul D. Waite
    Apr 3 at 16:27














  • 7





    Is there a specific project this is for? I'm just curious

    – Ben Leggiero
    Apr 2 at 3:35






  • 5





    @BenLeggiero Thank you for your question. I don't have a certain project but I thought it would be handy to know the existence of such QR codes. For example, you can put those in a bio on a forum if the forum doesn't support profile pictures, and many more advantages.

    – Murat Kaçiran
    Apr 2 at 10:19











  • At a small enough font size, you don't even need the black boxes!

    – Paul D. Waite
    Apr 3 at 16:27








7




7





Is there a specific project this is for? I'm just curious

– Ben Leggiero
Apr 2 at 3:35





Is there a specific project this is for? I'm just curious

– Ben Leggiero
Apr 2 at 3:35




5




5





@BenLeggiero Thank you for your question. I don't have a certain project but I thought it would be handy to know the existence of such QR codes. For example, you can put those in a bio on a forum if the forum doesn't support profile pictures, and many more advantages.

– Murat Kaçiran
Apr 2 at 10:19





@BenLeggiero Thank you for your question. I don't have a certain project but I thought it would be handy to know the existence of such QR codes. For example, you can put those in a bio on a forum if the forum doesn't support profile pictures, and many more advantages.

– Murat Kaçiran
Apr 2 at 10:19













At a small enough font size, you don't even need the black boxes!

– Paul D. Waite
Apr 3 at 16:27





At a small enough font size, you don't even need the black boxes!

– Paul D. Waite
Apr 3 at 16:27










1 Answer
1






active

oldest

votes


















163














Yes! There is a utility called qrencode that can render these for you.



The only really important factor for a QR code is that the 2D array has "darker" and "ligher" pixels / segments. It can be colored too, though contrast can start to be an issue.



ASCII



Your ability to read this QR code will likely depend on the camera's resolution, distance, and the software you're using.



qrencode -t ASCIIi 'https://superuser.com/questions/1420001/is-it-possible-to-write-a-qr-code'


Note: I used -t ASCIIi (Inverted ASCII) because my terminal is White-on-Black.



ASCII QR Code



ANSI



This mode works by setting the background color to black or white, and printing a number of space characters.



qrencode -t ANSI 'https://superuser.com/questions/1420001/is-it-possible-to-write-a-qr-code'


ANSI QR Code



Some of the raw characters written to the terminal are shown below, these are ANSI escape codes. An "escape" character has a value of 0x1b and can often be written as e.





  • e[40m sets the background color to black


  • e[47m sets the background color to white


  • 0x20 is an ASCII space


ANSI QR Code Raw



UTF-8



There is also a UTF-8 mode (-t UTF8). This mode uses the "half block" characters to increase the density, and cut the line count by half.




  • ▀ - U+2580 / Upper Half Block

  • ▄ - U+2584 / Lower Half Block

  • █ - U+2588 / Full Block


Screenshot from @grawity (thanks)



qrencode -t UTF8 'https://superuser.com/questions/1420001/is-it-possible-to-write-a-qr-code'
qrencode -t ANSIUTF8 'https://superuser.com/questions/1420001/is-it-possible-to-write-a-qr-code'


UTF-8 QR Code






share|improve this answer





















  • 3





    Don't forget -t UTF-8 mode, which uses the "box drawings" characters that OP mentions?

    – grawity
    Apr 1 at 15:00






  • 9





    i.imgur.com/WQYkxYm.png i.imgur.com/KeDVJ16.png – this uses "half block" characters , with optional colors to increase contrast only. (They're from Unicode 1.1 and date all the way to IBM DOS; surprised there's still any terminal that cannot render those...)

    – grawity
    Apr 1 at 15:04








  • 7





    @MuratKaçiran: Powershell and CMD are just command interpreters (shells), they both use the same "Windows Console" as the terminal. It too has received significant improvements in Win10.18xx. In the past, it did not support UTF-8 at all. It could do Unicode via UTF-16 with suitably written programs, but those programs had to deliberately use the special Unicode mode. If the program didn't do that, all you get is the MS-DOS era cp437 codepages... In that situation, qrencode -t UTF8 | iconv -f utf8 -t cp437 may still work, as the same box drawings also existed back then.

    – grawity
    Apr 2 at 11:46








  • 6





    To my surprise, the QR reader app on my iphone successfully read all these off my screen, including the ASCII # one. +1.

    – Digital Trauma
    Apr 3 at 17:10






  • 3





    @Attie: Oh, I probably had accidentally selected some text so it shows part of the line in reverse-text.

    – grawity
    Apr 4 at 10:30












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1 Answer
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1 Answer
1






active

oldest

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active

oldest

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active

oldest

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163














Yes! There is a utility called qrencode that can render these for you.



The only really important factor for a QR code is that the 2D array has "darker" and "ligher" pixels / segments. It can be colored too, though contrast can start to be an issue.



ASCII



Your ability to read this QR code will likely depend on the camera's resolution, distance, and the software you're using.



qrencode -t ASCIIi 'https://superuser.com/questions/1420001/is-it-possible-to-write-a-qr-code'


Note: I used -t ASCIIi (Inverted ASCII) because my terminal is White-on-Black.



ASCII QR Code



ANSI



This mode works by setting the background color to black or white, and printing a number of space characters.



qrencode -t ANSI 'https://superuser.com/questions/1420001/is-it-possible-to-write-a-qr-code'


ANSI QR Code



Some of the raw characters written to the terminal are shown below, these are ANSI escape codes. An "escape" character has a value of 0x1b and can often be written as e.





  • e[40m sets the background color to black


  • e[47m sets the background color to white


  • 0x20 is an ASCII space


ANSI QR Code Raw



UTF-8



There is also a UTF-8 mode (-t UTF8). This mode uses the "half block" characters to increase the density, and cut the line count by half.




  • ▀ - U+2580 / Upper Half Block

  • ▄ - U+2584 / Lower Half Block

  • █ - U+2588 / Full Block


Screenshot from @grawity (thanks)



qrencode -t UTF8 'https://superuser.com/questions/1420001/is-it-possible-to-write-a-qr-code'
qrencode -t ANSIUTF8 'https://superuser.com/questions/1420001/is-it-possible-to-write-a-qr-code'


UTF-8 QR Code






share|improve this answer





















  • 3





    Don't forget -t UTF-8 mode, which uses the "box drawings" characters that OP mentions?

    – grawity
    Apr 1 at 15:00






  • 9





    i.imgur.com/WQYkxYm.png i.imgur.com/KeDVJ16.png – this uses "half block" characters , with optional colors to increase contrast only. (They're from Unicode 1.1 and date all the way to IBM DOS; surprised there's still any terminal that cannot render those...)

    – grawity
    Apr 1 at 15:04








  • 7





    @MuratKaçiran: Powershell and CMD are just command interpreters (shells), they both use the same "Windows Console" as the terminal. It too has received significant improvements in Win10.18xx. In the past, it did not support UTF-8 at all. It could do Unicode via UTF-16 with suitably written programs, but those programs had to deliberately use the special Unicode mode. If the program didn't do that, all you get is the MS-DOS era cp437 codepages... In that situation, qrencode -t UTF8 | iconv -f utf8 -t cp437 may still work, as the same box drawings also existed back then.

    – grawity
    Apr 2 at 11:46








  • 6





    To my surprise, the QR reader app on my iphone successfully read all these off my screen, including the ASCII # one. +1.

    – Digital Trauma
    Apr 3 at 17:10






  • 3





    @Attie: Oh, I probably had accidentally selected some text so it shows part of the line in reverse-text.

    – grawity
    Apr 4 at 10:30
















163














Yes! There is a utility called qrencode that can render these for you.



The only really important factor for a QR code is that the 2D array has "darker" and "ligher" pixels / segments. It can be colored too, though contrast can start to be an issue.



ASCII



Your ability to read this QR code will likely depend on the camera's resolution, distance, and the software you're using.



qrencode -t ASCIIi 'https://superuser.com/questions/1420001/is-it-possible-to-write-a-qr-code'


Note: I used -t ASCIIi (Inverted ASCII) because my terminal is White-on-Black.



ASCII QR Code



ANSI



This mode works by setting the background color to black or white, and printing a number of space characters.



qrencode -t ANSI 'https://superuser.com/questions/1420001/is-it-possible-to-write-a-qr-code'


ANSI QR Code



Some of the raw characters written to the terminal are shown below, these are ANSI escape codes. An "escape" character has a value of 0x1b and can often be written as e.





  • e[40m sets the background color to black


  • e[47m sets the background color to white


  • 0x20 is an ASCII space


ANSI QR Code Raw



UTF-8



There is also a UTF-8 mode (-t UTF8). This mode uses the "half block" characters to increase the density, and cut the line count by half.




  • ▀ - U+2580 / Upper Half Block

  • ▄ - U+2584 / Lower Half Block

  • █ - U+2588 / Full Block


Screenshot from @grawity (thanks)



qrencode -t UTF8 'https://superuser.com/questions/1420001/is-it-possible-to-write-a-qr-code'
qrencode -t ANSIUTF8 'https://superuser.com/questions/1420001/is-it-possible-to-write-a-qr-code'


UTF-8 QR Code






share|improve this answer





















  • 3





    Don't forget -t UTF-8 mode, which uses the "box drawings" characters that OP mentions?

    – grawity
    Apr 1 at 15:00






  • 9





    i.imgur.com/WQYkxYm.png i.imgur.com/KeDVJ16.png – this uses "half block" characters , with optional colors to increase contrast only. (They're from Unicode 1.1 and date all the way to IBM DOS; surprised there's still any terminal that cannot render those...)

    – grawity
    Apr 1 at 15:04








  • 7





    @MuratKaçiran: Powershell and CMD are just command interpreters (shells), they both use the same "Windows Console" as the terminal. It too has received significant improvements in Win10.18xx. In the past, it did not support UTF-8 at all. It could do Unicode via UTF-16 with suitably written programs, but those programs had to deliberately use the special Unicode mode. If the program didn't do that, all you get is the MS-DOS era cp437 codepages... In that situation, qrencode -t UTF8 | iconv -f utf8 -t cp437 may still work, as the same box drawings also existed back then.

    – grawity
    Apr 2 at 11:46








  • 6





    To my surprise, the QR reader app on my iphone successfully read all these off my screen, including the ASCII # one. +1.

    – Digital Trauma
    Apr 3 at 17:10






  • 3





    @Attie: Oh, I probably had accidentally selected some text so it shows part of the line in reverse-text.

    – grawity
    Apr 4 at 10:30














163












163








163







Yes! There is a utility called qrencode that can render these for you.



The only really important factor for a QR code is that the 2D array has "darker" and "ligher" pixels / segments. It can be colored too, though contrast can start to be an issue.



ASCII



Your ability to read this QR code will likely depend on the camera's resolution, distance, and the software you're using.



qrencode -t ASCIIi 'https://superuser.com/questions/1420001/is-it-possible-to-write-a-qr-code'


Note: I used -t ASCIIi (Inverted ASCII) because my terminal is White-on-Black.



ASCII QR Code



ANSI



This mode works by setting the background color to black or white, and printing a number of space characters.



qrencode -t ANSI 'https://superuser.com/questions/1420001/is-it-possible-to-write-a-qr-code'


ANSI QR Code



Some of the raw characters written to the terminal are shown below, these are ANSI escape codes. An "escape" character has a value of 0x1b and can often be written as e.





  • e[40m sets the background color to black


  • e[47m sets the background color to white


  • 0x20 is an ASCII space


ANSI QR Code Raw



UTF-8



There is also a UTF-8 mode (-t UTF8). This mode uses the "half block" characters to increase the density, and cut the line count by half.




  • ▀ - U+2580 / Upper Half Block

  • ▄ - U+2584 / Lower Half Block

  • █ - U+2588 / Full Block


Screenshot from @grawity (thanks)



qrencode -t UTF8 'https://superuser.com/questions/1420001/is-it-possible-to-write-a-qr-code'
qrencode -t ANSIUTF8 'https://superuser.com/questions/1420001/is-it-possible-to-write-a-qr-code'


UTF-8 QR Code






share|improve this answer















Yes! There is a utility called qrencode that can render these for you.



The only really important factor for a QR code is that the 2D array has "darker" and "ligher" pixels / segments. It can be colored too, though contrast can start to be an issue.



ASCII



Your ability to read this QR code will likely depend on the camera's resolution, distance, and the software you're using.



qrencode -t ASCIIi 'https://superuser.com/questions/1420001/is-it-possible-to-write-a-qr-code'


Note: I used -t ASCIIi (Inverted ASCII) because my terminal is White-on-Black.



ASCII QR Code



ANSI



This mode works by setting the background color to black or white, and printing a number of space characters.



qrencode -t ANSI 'https://superuser.com/questions/1420001/is-it-possible-to-write-a-qr-code'


ANSI QR Code



Some of the raw characters written to the terminal are shown below, these are ANSI escape codes. An "escape" character has a value of 0x1b and can often be written as e.





  • e[40m sets the background color to black


  • e[47m sets the background color to white


  • 0x20 is an ASCII space


ANSI QR Code Raw



UTF-8



There is also a UTF-8 mode (-t UTF8). This mode uses the "half block" characters to increase the density, and cut the line count by half.




  • ▀ - U+2580 / Upper Half Block

  • ▄ - U+2584 / Lower Half Block

  • █ - U+2588 / Full Block


Screenshot from @grawity (thanks)



qrencode -t UTF8 'https://superuser.com/questions/1420001/is-it-possible-to-write-a-qr-code'
qrencode -t ANSIUTF8 'https://superuser.com/questions/1420001/is-it-possible-to-write-a-qr-code'


UTF-8 QR Code







share|improve this answer














share|improve this answer



share|improve this answer








edited Apr 2 at 10:42

























answered Apr 1 at 14:54









AttieAttie

13k43548




13k43548








  • 3





    Don't forget -t UTF-8 mode, which uses the "box drawings" characters that OP mentions?

    – grawity
    Apr 1 at 15:00






  • 9





    i.imgur.com/WQYkxYm.png i.imgur.com/KeDVJ16.png – this uses "half block" characters , with optional colors to increase contrast only. (They're from Unicode 1.1 and date all the way to IBM DOS; surprised there's still any terminal that cannot render those...)

    – grawity
    Apr 1 at 15:04








  • 7





    @MuratKaçiran: Powershell and CMD are just command interpreters (shells), they both use the same "Windows Console" as the terminal. It too has received significant improvements in Win10.18xx. In the past, it did not support UTF-8 at all. It could do Unicode via UTF-16 with suitably written programs, but those programs had to deliberately use the special Unicode mode. If the program didn't do that, all you get is the MS-DOS era cp437 codepages... In that situation, qrencode -t UTF8 | iconv -f utf8 -t cp437 may still work, as the same box drawings also existed back then.

    – grawity
    Apr 2 at 11:46








  • 6





    To my surprise, the QR reader app on my iphone successfully read all these off my screen, including the ASCII # one. +1.

    – Digital Trauma
    Apr 3 at 17:10






  • 3





    @Attie: Oh, I probably had accidentally selected some text so it shows part of the line in reverse-text.

    – grawity
    Apr 4 at 10:30














  • 3





    Don't forget -t UTF-8 mode, which uses the "box drawings" characters that OP mentions?

    – grawity
    Apr 1 at 15:00






  • 9





    i.imgur.com/WQYkxYm.png i.imgur.com/KeDVJ16.png – this uses "half block" characters , with optional colors to increase contrast only. (They're from Unicode 1.1 and date all the way to IBM DOS; surprised there's still any terminal that cannot render those...)

    – grawity
    Apr 1 at 15:04








  • 7





    @MuratKaçiran: Powershell and CMD are just command interpreters (shells), they both use the same "Windows Console" as the terminal. It too has received significant improvements in Win10.18xx. In the past, it did not support UTF-8 at all. It could do Unicode via UTF-16 with suitably written programs, but those programs had to deliberately use the special Unicode mode. If the program didn't do that, all you get is the MS-DOS era cp437 codepages... In that situation, qrencode -t UTF8 | iconv -f utf8 -t cp437 may still work, as the same box drawings also existed back then.

    – grawity
    Apr 2 at 11:46








  • 6





    To my surprise, the QR reader app on my iphone successfully read all these off my screen, including the ASCII # one. +1.

    – Digital Trauma
    Apr 3 at 17:10






  • 3





    @Attie: Oh, I probably had accidentally selected some text so it shows part of the line in reverse-text.

    – grawity
    Apr 4 at 10:30








3




3





Don't forget -t UTF-8 mode, which uses the "box drawings" characters that OP mentions?

– grawity
Apr 1 at 15:00





Don't forget -t UTF-8 mode, which uses the "box drawings" characters that OP mentions?

– grawity
Apr 1 at 15:00




9




9





i.imgur.com/WQYkxYm.png i.imgur.com/KeDVJ16.png – this uses "half block" characters , with optional colors to increase contrast only. (They're from Unicode 1.1 and date all the way to IBM DOS; surprised there's still any terminal that cannot render those...)

– grawity
Apr 1 at 15:04







i.imgur.com/WQYkxYm.png i.imgur.com/KeDVJ16.png – this uses "half block" characters , with optional colors to increase contrast only. (They're from Unicode 1.1 and date all the way to IBM DOS; surprised there's still any terminal that cannot render those...)

– grawity
Apr 1 at 15:04






7




7





@MuratKaçiran: Powershell and CMD are just command interpreters (shells), they both use the same "Windows Console" as the terminal. It too has received significant improvements in Win10.18xx. In the past, it did not support UTF-8 at all. It could do Unicode via UTF-16 with suitably written programs, but those programs had to deliberately use the special Unicode mode. If the program didn't do that, all you get is the MS-DOS era cp437 codepages... In that situation, qrencode -t UTF8 | iconv -f utf8 -t cp437 may still work, as the same box drawings also existed back then.

– grawity
Apr 2 at 11:46







@MuratKaçiran: Powershell and CMD are just command interpreters (shells), they both use the same "Windows Console" as the terminal. It too has received significant improvements in Win10.18xx. In the past, it did not support UTF-8 at all. It could do Unicode via UTF-16 with suitably written programs, but those programs had to deliberately use the special Unicode mode. If the program didn't do that, all you get is the MS-DOS era cp437 codepages... In that situation, qrencode -t UTF8 | iconv -f utf8 -t cp437 may still work, as the same box drawings also existed back then.

– grawity
Apr 2 at 11:46






6




6





To my surprise, the QR reader app on my iphone successfully read all these off my screen, including the ASCII # one. +1.

– Digital Trauma
Apr 3 at 17:10





To my surprise, the QR reader app on my iphone successfully read all these off my screen, including the ASCII # one. +1.

– Digital Trauma
Apr 3 at 17:10




3




3





@Attie: Oh, I probably had accidentally selected some text so it shows part of the line in reverse-text.

– grawity
Apr 4 at 10:30





@Attie: Oh, I probably had accidentally selected some text so it shows part of the line in reverse-text.

– grawity
Apr 4 at 10:30










Murat Kaçiran is a new contributor. Be nice, and check out our Code of Conduct.










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Murat Kaçiran is a new contributor. Be nice, and check out our Code of Conduct.













Murat Kaçiran is a new contributor. Be nice, and check out our Code of Conduct.












Murat Kaçiran is a new contributor. Be nice, and check out our Code of Conduct.
















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