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Why a code QR code
Slides and printed handouts are a poor place to read source code, and typing a long repository address from a projector rarely works. A code QR code opens the exact source you mean: a repository, a single file, a snippet or a range of lines on GitHub, GitLab, Bitbucket, Codeberg or your own server. Paste the link from your code host. A permanent link to a commit keeps showing the same code even after the branch moves on, while a branch link always shows the latest version. Scanning only opens a page for reading; nothing runs on the phone, and private repositories still ask for a login.
- Audiences open the exact file or lines you are talking about.
- Works with any code host, not just GitHub.
- Commit links freeze the code; branch links follow the latest version.
- After the talk, the code can lead to an improved example.
Conference speakers
The last slide opens the repository with all the demo code.
Coding workshops
Each exercise sheet links to its starter file and later to the solution.
Embedded and hardware projects
A code printed on the circuit board leads to its firmware source.
Technical books
Printed listings link to the full, runnable example online.
Code reviews on paper
Architecture diagrams link to the module each box describes.
More Files QR codes
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Source Code QR Code Generator
A code QR code points developers to source code: a repository, a single file, a snippet or a range of highlighted lines on GitHub, GitLab, Bitbucket or another code host.
What is this QR code?
The code opens the address you enter, so line links such as GitHub's #L10-L20 and links to a fixed commit keep working. Access follows the host's rules: private repositories still need a login.
Best use cases
- ✓Conference slides pointing to the example repository.
- ✓Workshop sheets linking to the solution file for each exercise.
- ✓Hardware boards labelled with a link to their firmware source.
- ✓Printed documentation that references a specific code sample.
How to generate your QR code
Open the repository, file or lines you want to show on your code host.
Copy the link, using a permanent link to a commit if the code must not change.
Check the page on a phone while logged out to confirm it is public.
Print the code next to the slide, exercise or component it explains.
Frequently Asked Questions
Does scanning run the code?
No. The code only opens a web page where the source can be read; nothing is executed on the phone.
How is this different from the GitHub type?
The GitHub type builds profile links from usernames. This type takes any code host and exact files, lines or commits.
Which code hosts work?
Any host with web links, such as GitHub, GitLab, Bitbucket, Codeberg or a self-hosted server.
Can I highlight specific lines?
Yes, if your host supports line links. On GitHub, add #L10-L20 to a file link to highlight those lines.
Should I link a branch or a commit?
Link a commit when the code must match the printed text; link a branch when readers should always see the newest version.
Is a public repository required?
For visitors without access, yes. Private repositories ask them to sign in with the right permissions.
How is this type different from the GitHub one?
The GitHub type creates profile links from usernames. This type opens any code page you paste, on any host.
Does anything run when the code is scanned?
No. The phone simply opens a page where the source can be read.