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---
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layout: mini
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comments: true
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title: "QR CODE MAKING: BIGGER IS SMALLER"
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permalink: /n/qr.html
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sitemap: true
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excerpt:
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WHEN YOU MAKE QR CODES, CAPITAL LETTERS MEAN SMALLER QR CODE AND OTHER NOTES
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ON MAKING THEM.
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---
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# QR CODE MAKING: BIGGER IS SMALLER
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_{{ page.excerpt }}_
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That is a neat trick
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[from Terence Eden's blog where the cause is also explained](https://shkspr.mobi/blog/2025/02/why-are-qr-codes-with-capital-letters-smaller-than-qr-codes-with-lower-case-letters/).
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<!-- editorconfig-checker-disable -->
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<!-- prettier-ignore-start -->
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<!-- START doctoc generated TOC please keep comment here to allow auto update -->
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<!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE -->
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<em lang="fi">Automaattinen sisällysluettelo</em> / <em lang="en">Automatically generated Table of Contents</em>
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- [qrencode](#qrencode)
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- [WiFi QR codes](#wifi-qr-codes)
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- [iwd Device Provisioning Protocol](#iwd-device-provisioning-protocol)
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- [Other methods of generating QR codes](#other-methods-of-generating-qr-codes)
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- [QR code readers](#qr-code-readers)
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- [See also](#see-also)
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<!-- END doctoc generated TOC please keep comment here to allow auto update -->
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<!-- prettier-ignore-end -->
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<!-- editorconfig-checker-enable -->
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## qrencode
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`qrencode` is my favourite method of creating QR codes, with the above fact a
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small QR pointing to my website would be:
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- `qrencode -t utf8 -i https://aminda.eu`
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- `-t utf8` outputs to terminal as unicode and `-i` ignores case turning input
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UPPERCASE.
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However my former goto was:
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- `qrencode -l H -t utf8 https://aminda.eu` which would feature higher error
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correction allowing more damage (including art) while still working.
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Storage:
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- `qrencode -i -s 6 -l H -o aminda.eu https://aminda.eu`
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- This `-s 6` doubles the pixel size, `-l H` uses highest error correction and
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`-o aminda.eu` outputs the image to `aminda.eu.png`. This could be converted
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through `magick aminda.eu.png aminda.eu.jpg`
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However usually I end up to
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[qr.bash](https://gitea.blesmrt.net/mikaela/scripts/src/branch/master/bash/qr.bash).
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## WiFi QR codes
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For details on the specification, please refer to
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[Barcode Contents on zxing wiki instead](https://github.com/zxing/zxing/wiki/Barcode-Contents#wi-fi-network-config-android-ios-11).
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- Open network with SSID `openwireless.org_nomap`:
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`qrencode -t utf8 "WIFI:T:nopass;S:openwireless.org_nomap;;"`
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([wifiqr-open.bash](https://gitea.blesmrt.net/mikaela/scripts/src/branch/master/bash/wifiqr-open.bash))
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- WPAX protected network with SSID `Hollow` and key `Bastion`:
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`qrencode -t utf8 "WIFI:T:WPA;S:Hollow;P:Bastion;H:false;"`
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([wifiqr.bash](https://gitea.blesmrt.net/mikaela/scripts/src/branch/master/bash/wifiqr.bash))
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- Hidden networks? Change the `H:false` to `H:true`.
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### iwd Device Provisioning Protocol
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If you are using iwd for WiFi management, forget the above and to add a new dpp
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capable device onto your network, instead `iwctl dpp wlan0 start-configurator`
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which requires `qrencode`.
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To stop provisioning new devices `iwctl dpp wlan0 stop`.
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Obviously don't include the dots and replace `wlan0` with your actual interface.
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## Other methods of generating QR codes
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- [DuckDuckGo search beginning with qrcode](https://start.duckduckgo.com/?q=qrcode+HELLO+WORLD)
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- [Firefox add-on: Offline QR Code Generator](https://addons.mozilla.org/firefox/addon/offline-qr-code-generator/)
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- This has spared me headache countless times on school computers for getting
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URL stored to my browser from school computers or virtual machines without
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complicated setups.
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- [Chrome Web Store: QR Code](https://chromewebstore.google.com/detail/qr-code/cbimgpnbgalffiohilfglgkkhpegpjlo)
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- BinaryEye & SecUSo for Android below
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## QR code readers
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- The stock Camera app.
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- At least on iOS and SailfishOS.
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- [BinaryEye](https://github.com/markusfisch/BinaryEye) is my go-to app for QR
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codes and will tell you more than you might want to know about them.
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[Google Play](https://play.google.com/store/apps/details?id=de.markusfisch.android.binaryeye)
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[F-Droid](https://f-droid.org/en/packages/de.markusfisch.android.binaryeye/)
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- [SecUSo: Privacy Friendly QR Code Scanner for Android ](https://github.com/SecUSo/privacy-friendly-qr-scanner)
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[Google Play](https://play.google.com/store/apps/details?id=com.secuso.privacyFriendlyCodeScanner)
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[F-Droid](https://f-droid.org/repository/browse/?fdid=com.secuso.privacyFriendlyCodeScanner)
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### See also
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- [Mikaela/gist directory vcard](https://gitea.blesmrt.net/mikaela/gist/src/branch/master/vcard)
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