A QR code that can generate QR codes
data:text/html,<script>d=new%20DecompressionStream('deflate-raw');w=d.writable.getWriter();w.write(new%20Uint8Array([...[...location.hash.slice(1).matchAll('.{16}')].map(s=>(+s[0]).toString(2).padStart(53,0)).join``.matchAll`.{8}`].map(s=>parseInt(s[0],2)).slice(0,2550)));w.close();d.readable.getReader().read().then(v=>eval(new%20TextDecoder().decode(v.value)))</script>#4410266470807234730992868952275246841639565580320691446019841315335811183591427665032091039463875444021094202372580125721880936281276205442554005892152297401979508984953587838881365424647522328122878334757369362881856356159779374109601733777793159837000068101723713235062271548704136959747626827838910566425753219562241035385405455463567605979865657952790541658595595687392542818816994275955309847161494031274287727871756548774591697337535401244591198334173612695654708307056918282845852568849865814201951988024967989434021146054617728001296128259471115829833179366760690437806542739935044814237537594855917352550632695898258226284368787178193012266193294850679983551741328093321145563156134054961238051487725027058844197565895028744345217039710838347274898921226431563426869448197100467833762729600032950220017954127705700612704675056356431853725649684924300733095775755628222304789122556100878446610497978377555508667911859202306303561635377513595047819214961786742275975497798358159142355952838036281653572128651286400542550170720754158120944843425728450075181215200579579693723086536774612368198623376398781240027041039504847643327001648099686712965010700270633729355802691796287157920352087216087927974075686330668829155410700260649389159589887230718648273690711193463281597473298236107565858735357041615881688891395124393034525945920124928731646616752109407175704228620930772556232451712109169193813045246065980247711440938923325908372116783727151667755219468983565831702052177679108077435640390091503562756938119258590946763289858894403275506868312092269543608307019574526626825241402740962916317675925954200575263904525400087670167901187084851380668547303770436280602567085247628946475481249015639360188874255419018743664946880588568723866835473660559972838011896778201843404809263204127188119610067682108937081946036698213562952276722487146149109554986235240208942581084659032215782544708888875817561763216585857090062969464700477665202748753482862637046564806420218523878021309320694039917072455146068866221847969281057747780011735008065312280056799920347983661034128402521322220856939713969731555035498848968606551154214013450704818724267124537799544120844062773423100998076066232620257313209120326233841113205539171703886214588912521175903185395244956763320220126276839569515366042428556459138048730926896200705811954294188114274024323228462729011586610598330206650052909133912247683359822914933589671206684674399455071557261254882231693387388380007130836568305089537147173612076387772461075705126048631328538925187023456893003558416353200502105810093848243591488470010976954791352500507241649863633620465235309541181972340656145296057427481139593174105537271260827758891324550244991382654297316691416838571719687923197463897945695167002014020376134800812705739546351318380291003850324856371749051552200072175595453873034672711622081609185458770062089987716353068566012621320911808487663329087849263240165868363807402051705052893571681724361943410101215336553687852684452310529216440435979244276918159417419673152264728189561809136416675975810978143497040538715403225013981735267007899198940524740917721998310597349883845399379109667892978033942985609695338076709282829862868799586701870629632586302917436678629642649816641086390809274189907676653801384314236430356572598798259491259660423506002051261634502332567461678151436668068908197397780753610305127762949578897011301715293060863323710141927024002148280837765361522689479552143245608418441781007561459143400945767076577770216769754833370979645157051802573748096968951614271529334944048550462727511343559982426125754915642717045600458099032845345222517461497356039786943630795872636583131345917039245562565065142282399081779491938965238192779434615211689192133731996256330309997878805451808641669689841960845681353354116277346191673268473090608616209734573861403021315984135243173597252279612217269072629159085706390055186886404547571695740509141564245965681186207976598444196508297137836916468059645485827030369113234137469185753056328687344349830272781371488286113633943104002691020655050368903344519299044763334423249339801265299560977736472341154476029806111844814373973418614928693438041488973312456859174185469465655120686685838940045209902797297814770839921736121404618833716334505640645051579910383266505925898120210595634386340365822159062477987858612881114788590925266331846283001116366037690282720765787532133431674878791635129538880545644640372298629672417253368514876865614441284881277217774115837724104234211383296170420551599726691698212156282410460185432957897568046707812201463137765530699042353527893051122848882399697023986927314423792428234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Made for Hack Club's Say Cheese YSWS :D
Note: If you're using an iPhone, point the camera at the QR code, click the QR icon in the bottom right, and copy the URL to your browser. Other QR scanners may need similar steps, they don't recognize data: URLs as URLs. You can also copy the URL above and paste it into a new tab to try it out without needing to scan the QR code.
The source code is in src/. The JavaScript files are compiled with Google's incredible Closure Compiler, then ran through Terser for good measure. The resulting bundle is then compressed with raw Deflate, converted to a string of decimal numbers, and appended to the end of prefix.html to create the final data: URL. The QR code uses byte mode and numeric mode, letting much more data fit in the QR code.
The prefix, golfed by hand, has a script tag which decodes, decompresses, and executes the bundle from the URL. The JS then writes a UI to the page, accepting text and generating QR codes, which are rendered to many <div>s in a CSS Grid. If no URL is inputted, it defaults to the current page's location, making the page a sort of quine, generating a QR code of itself.
To compile the QR code, install the dependencies and run the compile.ts script:
# imagemagick is optional, used for converting the SVG to PNG
winget install ImageMagick # windows
brew install imagemagick # mac
sudo apt install imagemagick # debian/ubuntu
bun i
bun compile.tsThis will generate a dist/qr.svg file with the QR code, as well as a dist/url.txt file with the URL to the page. It will also update the README.md with the new URL.
QR code generator adapted from alexeyten/qr-image (MIT licensed) and significantly trimmed down and golfed by hand.