Blog
Practical guides on QR codes, barcodes and keeping your data on your device.
How to Create a QR Code Without Uploading Data Online
Most free generators send your content to a server. Here is how to make a QR code entirely in your browser so nothing leaves your device.
What Is the Difference Between QR Codes and Barcodes?
They both encode data into a scannable image, but they are built for different jobs. Here is how to tell which one you actually need.
How to Make a WiFi QR Code for Guests
Let visitors join your network by scanning instead of typing a long password. Here is how WiFi QR codes work and how to make one safely.
How to Create a vCard QR Code for Business Cards
A vCard QR code drops your full contact details into someone’s phone with one scan. Here is how to build one that saves cleanly.
Code 128 vs Code 39: Which Barcode Should You Use?
Both encode letters and numbers, but they differ in density, character set and history. Here is how to choose between them.
How to Generate Product Barcodes for Inventory
A practical guide to choosing a format, structuring your codes and printing labels that scan reliably across your inventory.
How to Batch Generate QR Codes From a CSV File
Turn a spreadsheet of URLs, names or product codes into hundreds of QR codes in one pass, without uploading the file anywhere.
Best QR Code Sizes for Print and Packaging
Print a QR code too small and no one can scan it. Here is how to size codes for posters, packaging and business cards.
Why Browser-Based QR Code Generators Are Better for Privacy
When the encoding happens in your browser, your content never reaches a server. Here is why that architecture matters.
Best Free QR Code and Barcode Tools That Run in Your Browser
What to look for in a free, browser-based code tool, and the features that separate a good one from a data-harvesting one.
EAN-13 vs UPC-A: Choosing the Right Retail Barcode
They look almost identical and are closely related. Here is what actually separates EAN-13 from UPC-A and when to use each.
QR Code Error Correction Levels Explained (L, M, Q, H)
QR codes can still scan when partly damaged thanks to built-in redundancy. Here is what the four levels mean and when to use each.
How to Add a Logo to a QR Code Without Breaking It
A logo in the centre of a QR code looks great, until it stops scanning. Here is how to add branding while keeping the code readable.
Static vs Dynamic QR Codes: What’s the Difference?
Static codes hold their content directly; dynamic codes hide a redirect. Each has clear strengths, and clear privacy implications.
How to Make an Event QR Code for Calendar Invites
Let attendees add your event to their calendar with one scan. Here is how event QR codes work and how to build one.
A Restaurant’s Guide to QR Code Menus
QR menus are convenient and cheap to update, if you design them well. Here is how to make codes diners can actually scan.
ITF-14 Barcodes: A Guide for Shipping and Cartons
ITF-14 is the barcode you see on shipping cartons and outer cases. Here is what it encodes and how to print it so it survives the journey.
How to Validate a Barcode Before You Print It
A barcode that fails at the scanner is an expensive mistake once it is printed on thousands of items. Here is how to catch errors first.
SVG vs PNG for QR Codes: Which Should You Export?
Both are common QR export formats, but they behave very differently when you scale them. Here is how to choose.
Designing Scannable QR Codes: Contrast, Quiet Zones, and Color
A QR code can be styled and still scan reliably, if you respect a few rules. Here is how to brand a code without breaking it.