How to Decode a QR Code by Hand

where you filled E1 till E 7 are slightly wrong. this data will be filled with some air coming in the form of 11101100 and 00010001. your error correction bytes will start from E8

Dude, the Home lets you use a computer??

One question: Can the 3 alignment squares be decoded?

is there a way to decode biggger QR Codes? perhaps with different masks? can anyone explain it would be appreciated <3 :D

This is god level , definitely subscribing you. I am watching this video after 10 years since it was created but it is still relevent.

hey. I woke up with the obsessive idea to reverse engineer/decode a QR code. I couldn't thank you more for making this video, such a great amount of work, and purely explained. thank you very much

This is the crazy man’s sudoku😂

You are a genius. That was fun and easy to understand

thanks, now I don't have to scan QR code when I see it being posted on a wall, I can directly type the URL address on my phone!

now i can open the school smartboard anytime i want!

watching this 10yrs later, AMAZING

Not me watching this during the new year eve 😭

This is what true content looks like. THANK YOU. Perfectly done.

trying to make an algorythm that generates a QR code from a text, thanks

My brain cant handle qr code..😂

Incredibly detailed video. Deserves a medal:)

Another wonderful application of an ASCII table. I'll have to pass this along to my intro to programming students. Thank you so much. :D

This is cool as hell!

why the fuck do u put numbers in order but then invert them because binary is inverted, binary is not inverted, u just put the numbers in the wrong pattern

Today I was thinking I wanna learn to read qr code and well now I'm here

Hi! Congrats for the video! You explained very well a very complicated issue that nowadays became a regular stuff! 👏👏Keep up the good work! 🙏🙏

Robotmatics is my channel name... me laughs as his new channel name is Pillazo

This is probably something that a human can not even fully learn, no matter how much practice he takes on it.

Finally, I can play The Talos Principle without needing a phone.

Man your video is 100x better than the wikipedia sh$t

Very nice vid! But where can I generate QR-codes that is this "simple"?

do you know how to make a dynamic qr?

How the hell did I understand this

thank you for those effortssssssssssssssssss!!!

Hi!
I exported my accounts from Google Authenticator, but the QR code is too complex and will not be scanned by the phone. What is the solution? Would a good camera like an iphone be able to scan? Or is it possible to decode manually?

I think you made a mistake: When masking, the timing patterns are not skipped over but are simply ignored. If you'd look up the documentation you will find that the modules that need to be inverted are defined by simple formulas that take row and column coordinate as input. The one for vertical lines being: (row) mod 2 == 0.

Well that clears it up… 🤯

so touching for an excellent video

Hi .. is it possible to retrieve the 10% blurred QR code

is there email contact info for pillazo?

soo anyone watch the full thing? becaus i did not, like at all

Fun for nerds. Nerds would buy it every time.😎

what an amazing guide.

Are you sure the mask line skipped under the timing or not? Some pictures on the internet say it is. I'm fairly sure you applied the pattern incorrectly and just didn't get to the incorrect part by chance.

Thank you for the great video. What program did you use to create your QR code in the first place?

I have an old bitcoin gift card that the barcode got damage have is visible the other half is fainted...I want to decode it and or fix it...how do I do that? Can u help? I'm not a computer Sabi to do it!

WOW man this is amazing

Smart. Man. 🌷

Wow, that was cool.

Can I download that sheet somewhere?

qrcode still works after what 8 years

Thank you so much for this clear and detailed explanation! Appreciate the effort and time you spent in doing it!

Thank you for taking the time to explain this to mere mortals. I never dreamed one could actually decode these things "by hand" as you say. The explanation of what QR codes contain makes them less annoying somehow and I would never have the patience to read the Wikipedia page on the subject. Please stop and smell the roses (or do something else outside) to treat yourself!

Great job