Printing and design
What Size Should a QR Code Be? US Print Size Guide
How big to print a QR code for business cards, flyers, table tents, posters and signs, with a simple rule of thumb and a size chart in inches.
Guides
QR code guides
Practical, plain-English help for making QR codes that work the first time. Written and checked by the KeptLink team.
Printing and design
Why Isn't My QR Code Scanning? 10 Fixes
A QR code that won't scan usually has one of a few simple problems. Here are 10 fixes, from size and contrast to the quiet zone, logos and broken links.
Make a code for…
How to Make a WiFi QR Code (and Keep Your Password Safe)
Let guests join your WiFi with one scan. How WiFi QR codes work, which phones can read them, and how to share access without exposing your main network.
Make a code for…
Step-by-step help for the most common kinds of QR code.
- How to Make a QR Code for a Website Link
Turn any web page into a QR code in a minute. How to tidy the link, keep the code simple, test it on real phones and pick the right file for print.
- How to Make a WiFi QR Code (and Keep Your Password Safe)
Let guests join your WiFi with one scan. How WiFi QR codes work, which phones can read them, and how to share access without exposing your main network.
- vCard QR Code Format for Business Cards: The Complete Spec
Learn the exact vCard 3.0 format for QR codes on business cards. See the required tags, avoid dense codes that fail to scan, and download print-ready vector files.
- Email QR Code: Pre-Fill the Subject and Message
Make a QR code that opens a ready-to-send email with your address, subject and message filled in. How it works, good uses, and the limits to know.
Printing and design
Sizes, colors, logos and files that keep a printed code easy to scan.
- What Size Should a QR Code Be? US Print Size Guide
How big to print a QR code for business cards, flyers, table tents, posters and signs, with a simple rule of thumb and a size chart in inches.
- Why Isn't My QR Code Scanning? 10 Fixes
A QR code that won't scan usually has one of a few simple problems. Here are 10 fixes, from size and contrast to the quiet zone, logos and broken links.
- QR Code Colors That Work (and Ones That Don't)
How to use brand colors in a QR code and keep it scannable: dark on light, contrast ratio, gradients, inverted codes, and what changes when you print.
- How to Add a Logo to a QR Code Without Breaking It
Put your logo in the middle of a QR code and keep it scannable: how error correction works, how big the logo can be, and how to test before you print.
- SVG vs PNG vs PDF: Which QR Code File Should You Use?
Which QR code file to download for print, web, email and design tools like Canva or Word, and what to send a print shop so your code comes out sharp.
Understanding QR codes
How codes work, how long they last, and how to use them safely.
- Static vs Dynamic QR Codes: What's the Difference?
Static QR codes hold your content directly, while dynamic codes hold a short link you can change later. Learn how each works and which one you need.
- Do QR Codes Expire? What Can Stop a Code Working
Static QR codes never expire, but the things they point to can change. Learn what really breaks a QR code and how to check one before you print it.
- Are QR Codes Safe? A Guide for Scanners and Businesses
A QR code is just data, so the risk is where it leads. How to spot fake codes, scan safely, and protect the codes your business puts in front of customers.
- QRFY Alternatives: Dynamic QR Codes That Keep Working
Compare QRFY alternatives on trial limits, billing and what happens to printed codes when you cancel. Facts checked October 13, 2026.
Ideas for your business
Practical setups for places where customers scan every day.
- QR Codes for Restaurant Menus: A Practical Setup Guide
How to set up a menu QR code for your restaurant: where to link it, web page vs PDF, table tent sizes, and why you should still keep printed menus on hand.
- How to Make a QR Code for Google Reviews
Get your Google review link, turn it into a QR code customers can scan at the counter or table, and follow Google's rules for asking for reviews.
- Connect a Custom Domain to KeptLink: DNS Setup for Any Provider
Use go.yourbrand.com for KeptLink short links and QR codes: find your DNS host, add the two DNS records step by step for 12 providers, and fix common errors.
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