How QR Codes Are Built

During some coding for a uni assignment, I became interested in how QR codes are generated, and thought it would be an interesting topic for a video. The concepts that QR codes build on go way beyond the level covered in this video, but hopefully this gives a good introduction for those who are just curious.

[@andylindsaytunes]

There are countless videos claiming to do it, but this is the only vid that claims to explain how QR codes work, that actually does explain how they work.

[@mateodillon9412]

yessss

[@maximoaugustus1768]

You probably dont care but does anyone know a way to log back into an Instagram account..? I stupidly forgot my login password. I appreciate any assistance you can give me.

[@Nhatanh0475]

@@maximoaugustus1768 Ask Instagram assistant. And youtube ain't a place for that.

[@RageBearer]

Took me way to many videos to find this...hopfully we can get this to front page so someone else can find what they are looking for

[@chaosa928]

@@maximoaugustus1768 this is bait

[@christopherwillson4269]

Most of the "How QR codes work" videos are not actually how they work, but how they are used. You rang true. Excellent video!

[@jupeter8086]

I was literally searching whole of KZbin for this.....

[@MrMcChicken10]

@Jaime Bodie OH MY GOODNESS STOP

[@sudeepjainsudeep]

Absolutely, others are busy explaining how QR code has invented and its applications. Thanks for this video..

[@gooze3888]

@@MrMcChicken10 dont use God's name in vain please :(

[@MrMcChicken10]

@@gooze3888 sorry :(

[@sudheerkumarchivukula8328]

Damn .. Same here

[@ellipsiswellbeing1691]

I made the effort to sign in to google, just to give this video the recognition it deserves. As others have noted, very few other videos explain exactly how QR codes work - thank you for such a clear video!

[@nosknut]

Awesome work! Thank you for not just making a "long list of no information" like everyone else who seems like their videos are English essays!

[@PaulVaucher-CH]

Exactly what I was looking for! A clear, synthetic summary of how QR codes work!

[@beskamir5977]

That was really cool! Glad I found your channel through Matt Parker's math puzzles.

[@mushchlowastaken]

excellent video mate. straight to the point, spoken clearly, and exactly what was advertised. subscribing and hoping for more videos in this style :)

[@llspragulus]

This was the best explanation of a QR code. Thanks for this!

[@jaikowalik966]

Exactly the video I was looking to explain it! Thanks a lot - very helpful!

[@huanchanic6776]

if anyone was curius the qr code on the title just says to look up "james explains"

[@pavany4506]

This really explains how it is built and each cell's importance.

[@BigHotSauceBoss69]

Man, if only more people like you existed

[@ConcreteJungle95]

Fantastic video, thank you so much my curiosity is now satisfied

[@CarstenBauer]

Very amazing, thank you. I now understand QR codes a bit more.

[@Pax.YouTube]

Beautifully explained.

[@harshvardhan01]

This is the stuff I was looking for almost half an hour.

[@bcgibson22]

Fascinating!!

[@antoniogabrielchaconmenke83]

Oh wow, that was a really good explanation, and in just ~6 minutes! Great video

[@AgentM124]

You deserve so more subs man.

[@karl-ve2of]

Greatly explained! Thanks for video

[@ashwin_raikar]

Thanks for this simplified explanation

[@DeenSheriffdeen]

Excellent Video. Clearly explained.

[@subiektywnykomentarzd7676]

Top of the top, great work!

[@bryanredd4654]

Truly excellent video!

[@brianseo477]

Thanks for the video. Bless you!

[@loremipsum6113]

You deserve more subs, that's a cool explanation

[@SweDownhill]

Incredibly well explained! Thanks for sharing. 😍😃😎

[@GnobarEl]

Great video! Best explanation I found!

[@veganconservative1109]

Finally! I may not still understand it, but I gathered a lot more of the gist than the other 'instructional' "how do qr codes work" YT vids I watched.

[@olivieryamadeoeiderusli3224]

Thank you for the clear and short explanation :D

[@brick_layer541]

THANK YOU JAMES. Every other video I clicked was bogus clickbait. This was perfect.

[@nimaamintaghavi512]

What a great video! thanks a lot for the explanation :-)

[@anonymusanonymus2638]

It works! Thank you for your help!

[@reggiep75]

Finally, some clarity on the original 21x21 QR code and how data is stored without having to go thru the dark archives (THE DARKIVES? 😂) of the internet. I have found the DENSO white paper which is a nice read at 12 pages that expands on codes that were developed. Will have lurk around your vids and if there's stuff that entertains my mind, I'll sub. 👍

[@fiaztv3206]

thank you excellent and concise. perfect!

[@MuhammadKhan-yl7mt]

Omg who invented this, must be mathematical genius

[@ainurkurniawan4445]

1994 by Masahiro Hara

[@Pimp-Master]

Hardly, computer data packets use identical nomenclature... for what, 60 years now? Message start message end message check...

[@reggiep75]

Nah, just Japanese and the Japanese are the OTG's - Original Tech Gangstahs. 😂

[@thathuman4237]

Could you do a full guide in error correction data it is also really hard to find anything on how to do it?

[@varunagarwal8395]

Great explanation subbed!

[@blackphantom374]

Thanks for the knowledge

[@shulkerdragon8653]

A very good explanation!

[@Nhatanh0475]

When you invert it, my phone literally pick it up right away. These tech are amazing!

[@jerrybanks9216]

Excellent video much thanks 😊

[@thorwaldjohanson2526]

Excellent video!

[@SpokenWordPoet]

Perfect content! - Thank you so much! (The channel logo makes me wonder, if the gears will ever be able to rotate.)

[@nemod3338]

Yes, they will. As soon as one will fail.

[@charak100able]

well explained, James 😀

[@ludvikjerabek]

Fantastic!

[@user-hv4nl9rn8t]

I am a 13 year old who has to program a gui program in C that can create an QR code of 3 different standards. This was so helpful because I was stressing about this project so much.

[@navtejkalkat7482]

I I love this I love this show because it shows is all about QR codes that’s it

[@josecerezuela1850]

Outstanding!

[@jonsaircond8520]

Great explanation

[@ong1]

Easy and full explanation

[@imyasharya]

Hey James, recently the quick select tool of photoshop is getting me into thinking it really works. Is it all AI (which I also don't understand much about) or it is just an algorithm? I will be happy if you can throw some light on it.

[@bsmithril]

Reed-Solomon error correction. Thanks for specifying that!

[@hobby_coding]

that was very helpful

[@SamHawleywood]

Hi! This video was so informative - thank you! Can you have QR Codes that look different but take you to the same location?

[@sithutn5453]

Super helpful thanks

[@AgentM124]

So I would love to see an explanation for the reed Solomon. Maybe other version of QR, or other barcodes.

[@JamesExplains]

Yeah, I'm hoping to make one for Reed Solomon, but I've gotta try to wrap my head around it first and work out a good way to explain it!

[@AgentM124]

@@JamesExplains sounds good! Take your time, it's a lot of complicated formulas.

[@ultimatelegoman1279]

@@JamesExplains please post all your sources down below.

[@lumichromek]

I love how thumbnail says Jaymes explains

[@leeamraa]

thank you!

[@Billy_Dali]

thank you, this is helpful for understanding how it works. I am planning to get a QR code tattoo.

[@zuizi5200]

Ohh!! Thats cool :D

[@recepnadir1]

thank u..

[@ssunlimited9]

I was looking for how QR code’s work

[@tjnguyen746]

Thanks! 🙂🙂🙂

[@AndrewBrowner]

is there any available software to upload QR codes to and edit them to contain different information in certain sections?

[@MACAYCZ]

Thx bro:) subscribed!

[@powervirus3260]

The cool thig that if you scan the QR code of the thumbnail it will give you the link to this video 🙌

[@abulhashem7941]

What is 'mirrored in both sections of the formatting pattern?

[@maxim25o2]

Did You try with DATAMATRIX? Is another type of QR code?

[@mickhernandez2665]

i cant believe after 7 years since QR code exist, 7 billion users, theres still no 2 of the same QR code patterns

[@SKF358]

How is it read? By a laser light that zig zags from bottom right and up and down?

[@oceanman7868]

Somebody who gives me a propper explanation and not just the history or why qr code is usefull. Thanks!

[@cgMediaWorks]

Very well done! Thank you! My question is: how does the information stored in the code remain editable? Is that information (link, contact info, etc.) actually stored on and referenced through a server? Or does the pattern just by itself generate the information through the camera reader software? If so, how then does the information remain editable? For example, even with free QR generators, I can simply load up the image to change the linked info, but the image pattern does not change. So the QR on all my printed business cards still works but displays updated info. Ok, thank you again. Appreciated your thoughtful visual approach.

[@JamesExplains]

There's multiple ways it can be done. The QR code is just the data displayed in a visual way, so the raw data of the card (name and contact details and such) could be stored but then changes to them would change the QR code itself. It would most likely be the case that the system you use for your business card stores the contact details on their server, and the QR code contains the link to wherever the data is stored. That way the link to the data is always the same even when the data itself changes.

[@AndrewBrowner]

@@JamesExplains how many variations are there on modern QR cards? is it approaching infinite? ive noticed this local government service generates a QR code for each person and contains their name among other information but every time you refresh, reprint, or log in to get the page the QR code is visibly different this would mean there could be thousands of these QR codes for each person if everyone refreshed the page that many times further more none of this information is linked to servers as the scanners/codes work without an internet connection how hard would it be to edit such QR codes, are there any software programs available to do such?

[@Cheese145b]

Exellent i learned a bit of qr code but idont know how the error correction works

[@joaogusatti4925]

very intresting video, nice pfp btw a question: what is the meaning of "%" in 1:47 ?

[@joaogusatti4925]

ok nvm I just discovered by myself, thanks for everyone support!! it means the same as mod or rest of the divison (note that counting starts at zero, not at one)

[@vijayalaxmikhoday3024]

man. Thank you!

[@agustinbarquero8898]

Woman. You are welcome.

[@phuonglu1332]

Extremely helpful! Also I wonder what will happen if you scan it..

[@bigsykedaddy999]

You get "Rick Rolled" 😆

[@akshat0306]

I am lucky enough to find this video first try! (Definitely did not waste 46 minutes to find it)

[@pjerflajhar1028]

thank you

[@Alphag11]

Hi sorry for the question I was left the homework where I have 18 lines and I have to put them into a QR code. It’s like they gave me the 18 lines with numbers and spaces, which I have to fill into a QR

[@gangadharbhardwaj]

VERY NICE

[@MA-naconitor]

The theee masking bits doesn’t allign with the QR masking standard (example: 000 should be (i+j)%2=0, not (i*j)%2+(i*j)%3=0 (which incidently is 101)

[@benbarnes3089]

thanks james

[@bloodsucker5643]

You deserve more views

[@electricityandfire]

can I generate a qr code without error corection, if not can I find a simple way to gererate reed solomon error codes?

[@mrbit7038]

Does anyone know, how many bytes you can store on QR code?

[@lappa_]

Numeric Alphanumeric Kanji and Bytes and ... what are the others? the more comlicatet ones? (i'm from germany and i'm bad at english)

[@thisrandomperson8908]

i scanned the 117x1177 p qr code and it said the whole lyrics of never gonna give you up

[@jakubrejzekjunior7349]

I was trying to search this for like a week or two

[@melyssahand7851]

one and only easy and working method

[@ktkyt4727]

Thanks

[@sandermez3856]

how to get the timing between the big squares??!!!

[@mariaMartinez-ne8sp]

Fabulous

[@jebronekitty]

Finally a video that understand what I'm trying to search. I got all these awful videos on, "go to stupid, pay to create, QR code"

[@ChimkenNugget]

I watched this expecting answers, but ended up with more questions.

[@tpp1677]

Thumpnail: James Explains 6:02: James Explains

[@janicenelson4235]

What are the different parts of the qr code??

[@DeadBryan]

6:06 Rick roll QR code? No, it’s you James Explains

[@tradeshmarts2056]

Thank yoy james

[@Leotique]

thanks