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On 2 June 2010, QR code was linked from Slashdot, a high-traffic website. (Traffic) All prior and subsequent edits to the article are noted in its revision history.

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Text or other creative content from this version of QR code was copied or moved into Data Matrix with this edit. The former page's history now serves to provide attribution for that content in the latter page, and it must not be deleted as long as the latter page exists.

Please see the question posted here: https://stackoverflow.com/questions/79786399/does-this-code-indicate-a-mistake-in-wikipedias-example-on-the-qr-code-page

It appears that the image at the top of this page may not technically be a valid QR code. In that case, it should probably be updated in the name of accuracy. Bismurphy (talk) 14:24, 13 October 2025 (UTC)Reply

I have uploaded a modified file here:

I am not sure what the best path for this change is - perhaps it would be ideal to replace the existing file? I do not have permissions to do so, unfortunately. Bismurphy (talk) 16:02, 15 October 2025 (UTC)Reply

The section on error correction and the description of how the message is encoded is too technical for most readers. It would really benefit from a subject-area expert who could help explain in more comprehensible terms what that error correction method is doing, what kinds of errors it's correcting, where those errors come from, how it corrects the errors, and what the practical result of error correction is for encoding/decoding a message. Following the link to Reed–Solomon error correction doesn't really help, as that article is also very hard to understand for lay readers.

Bradhoot (talk) 16:02, 18 January 2026 (UTC)Reply

I think it’s worse than that. I don’t have confidence that the author understands Reed Solomon codes. I can’t reproduce the mathematics and am concerned the logic in the middle was made up in order to achieve the expected result. ~2026-42127-69 (talk) 11:54, 29 July 2026 (UTC)Reply

Hi User:ウィキの数鉄マニア!

The section you've added about a recommended trademark statement is unnecessary. For the purposes of the article itself, we don't need the exact trademark statement recommended by Denso Wave, as we're already clearly stating that Denso Wave is the trademark and wordmark holder of "QR Code" in the next paragraph of the License section. And for the purposes of including it to show to other people an example of what they should do if they're using the word "QR Code" in a webpage, Wikipedia is not a how-to guide. Information on how exactly to use the QR Code trademark is best left on the Denso Wave website, which is referenced in the section about the trademark.

If you still disagree, I'd be happy to hear what you think.

Eyesinthefire (talk) 17:43, 27 January 2026 (UTC)Reply

Thank you. I'm sorry. ウィキの数鉄マニア (talk) 12:15, 29 January 2026 (UTC)Reply

No worries whatsoever. Sorry if I came off as too brusque in reverting your edits. I really appreciate you making a constructive edit to this article and would encourage you to please keep editing Wikipedia!

Eyesinthefire (talk) 17:44, 29 January 2026 (UTC)Reply

This article was the subject of a Wiki Education Foundation-supported course assignment, between 15 January 2026 and 1 May 2026. Further details are available on the course page. Student editor(s): SupremeH3art (article contribs). Peer reviewers: Yewonn 81, Rhutchek, ElizaPurdue, Aseel Ageeb.

— Assignment last updated by Aseel Ageeb (talk) 21:57, 27 April 2026 (UTC)Reply

This edit request has been answered. Set the |answered= parameter to no to reactivate your request.

QR Code Changed To Rick Astley Youtube Video Suggestion to change it back to https://en.wikipedia.org/wiki/QR_code Patel8786 (talk) 05:58, 7 May 2026 (UTC)Reply

 Done Umby 🌕🐶 (talk) 06:30, 7 May 2026 (UTC)Reply

Apologies for missing this. Vandal was clever and claimed the change was related to the recent m.en changes. Eyesinthefire (talk) 13:52, 7 May 2026 (UTC)Reply

Decoding example has a significant amount of content as images rather than Wikitext. This is not accessible. While a lot of information is included on the files respective pages, Wikipedia is not a presentation and this content would properly be an article and not presentation slides. Thisisnotatest (talk) 23:06, 9 May 2026 (UTC)Reply

Agreed, the slide presentation-style example was inaccessible and unsuitable for the article, I've deleted it. I may make an attempt to rewrite it into a text example with supplementary images. I think leaving it with no decoding example for now is better than the slideshow gallery. Eyesinthefire (talk) 01:01, 20 May 2026 (UTC)Reply

Hello! I should have clarified and expanded my point in my edit summary removing HCC2D.

@Veryspecific, you say just because it's based on primary sources doesn't warrant complete removal (WP:PRIMARYNOTBAD) - and I agree! Several of the other QR code variants only have primary sources pointing to Denso Wave material. As Denso Wave sources, they're able to authoritatively establish them as QR code variants. However, the sources listed (and any I can find online) for the HCC2D do nothing to establish it as a QR code variant, only a separate barcode symbology which takes elements from QR codes. I don't think it's suitable for inclusion in Variants, nor is it suitable elsewhere in this article as a barcode symbology which takes elements from QR codes. I was unable to find sources to support it passing WP:GNG, otherwise I would have spun it into its own article.

I haven't done a full review of the other entries in the list of variants, I've only looked at HCC2D as it was recently edited. I suspect that Secure QR, and Accessible QR are likely also unsuitable for this article, but haven't looked into them closely enough to say for sure what my position on those is. In solidarity, Eyesinthefire (talk) 22:02, 10 August 2026 (UTC)Reply

Hi, thanks for responding in such a balanced manner. I do see an argument that HCC2D is not a direct QR code variant, as even the authors of the paper refer to it as a "color barcode" rather than a specific version of a QR code. However, since HCC2D (and probably also Accessible QR and Secure QR, though I haven't yet taken a look at them specifically) and "normal" QR codes include quite a lot of common design elements I think that they are worth mentioning in this article. (For example the system of error correction is shared between QR codes and HCC2D). Perhaps instead of being included in the section "Variants", they could be moved to a section called "Unofficial variants" (or another, better name) to distinguish the official QR code variants, like micro QR, from codes that derive from QR codes but are not described in the official specification. Veryspecific (talk) 22:28, 10 August 2026 (UTC)Reply

Are there third-party reliable sources that show that HCC2D is relevant to this article's subject, such that it warrants its own subsection? - Aoidh (talk) 23:34, 10 August 2026 (UTC)Reply