How Much Data Fits in a QR Code? Maximum Capacity by Type
Learn the maximum capacity of a QR Code by data type: numeric, alphanumeric, bytes and kanji. Versions, density and how to optimize your code.
Tutorials
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Tutorials
Tutorials
QR Code Error Correction: understanding levels L, M, Q and H
Learn what QR Code error correction is, how levels L, M, Q and H work, and when to use each one — including QR codes with a logo in the center.
Tutorials
History of the QR Code: who invented it, why, and how it reached you
Discover who invented the QR Code, the Denso Wave story, the open patent that changed everything, and the evolution from car parts to mobile payments.
Tutorials
Micro QR Code: What It Is, Key Differences, and When to Use It
Learn what Micro QR Code is, how it differs from standard QR Code, when it makes sense to use it, and the most common mistakes to avoid.
Tutorials
Does a QR Code Expire? Everything About QR Code Expiration
Static QR codes never expire. Dynamic QR codes can — learn why, how to avoid losing scans, and how to use expiration on purpose for coupons and flash sales.
Tutorials
How to check if a link is safe: URL checker guide
Learn how to verify a link before clicking. See how Code2Scan's URL checker reveals hidden destinations, HTTPS status, and site reputation instantly.
Tutorials
Password-Protected QR Code: exclusive access for the right audience
Learn how to create a password-protected QR Code on Code2Scan. Secure confidential documents, B2B price lists, paid courses, and VIP content easily.
Tutorials
Barcode Checker: How to Validate GTIN, EAN and UPC Before Printing
Learn how the GTIN/EAN/UPC check digit works and use the barcode checker to catch errors before they reach the packaging line. Full tutorial.
Tutorials
Link Shortener: what it is, how to use it, and how to track clicks
Turn long URLs into short, trackable links. Learn how to shorten a link for free, measure clicks by channel, and connect with QR Codes on Code2Scan.
Tutorials
Online Barcode Reader: scan any barcode from your phone or PC — no app needed
Learn how to read barcodes online without installing any app. Scan EAN, QR Code and more using your camera or a photo. Practical guide with common errors and fixes.
Tutorials
What Is a QR Code and How Does It Work: The Complete Beginner's Guide
Understand in simple terms what a QR Code is, how your camera reads the little squares, what it can hold, and where to use it. A clear guide for beginners.
Tutorials
How to generate a barcode for free: complete guide by type
Learn how to generate barcodes for free: EAN-13, CODE128, UPC and more. Step-by-step on Code2Scan's generator, check digit tips and key printing rules.