LINKMINT KNOWLEDGE BASE

Practical Guides for Links, QR Codes and Barcodes

Detailed, tested guidance for creating, checking, printing and maintaining the codes you use in real workflows.

Reviewed 5 October 2026 · Editorial and testing policy

Create a WhatsApp link with a message

Use the official click-to-chat format, prepare a message and share the result.

Print QR codes reliably

Choose PNG or SVG, preserve the quiet zone and test a production sample.

Choose a barcode format

Compare Code 128, Code 39, EAN, UPC and ITF-14 for the receiving workflow.

Static versus dynamic QR codes

Understand what can change after a code has been printed.

WhatsApp Link Not Working? A Step-by-Step Troubleshooting Guide

Find the exact fault in a wa.me link by checking the phone number, URL encoding, account availability and the device used for testing.

QR Code Error Correction: Choosing M, Q or H

Choose an error-correction level based on damage risk, data length and final print size instead of automatically selecting the highest setting.

QR Code Scan Testing Checklist for Print and Screens

Test the finished QR code in the same form, distance and lighting that customers will encounter—not only as a large image on your monitor.

EAN and UPC Check Digits: Calculation and Validation

A check digit catches many typing errors, but a mathematically valid number does not prove that a product identifier is assigned to you.

Code 128 Inventory Labels: A Practical Setup Guide

Code 128 can encode compact internal identifiers, but the label succeeds only when the value rules, printer, scanner and inventory system agree.

WiFi QR Codes: Compatibility, Privacy and Guest Network Safety

A WiFi QR code stores the network name and password in readable encoded text, so treat the printed code like a copy of the credential.

How these guides are produced

Every guide focuses on a task available in LinkMint, states the tool's limits and links to a primary technical source where one is available. Examples are checked against the live generator. Advice that depends on a printer, scanner, device or receiving system is presented as a testing procedure rather than a universal guarantee.

Start with the finished job

Choose the guide that matches the final use: a customer contact link, a code on a printed sign, a guest WiFi card or an inventory label. Generate a sample, test it through the complete workflow and keep a readable fallback for important uses.