Online Tools

Every device on the internet has an IP address — a numeric label that routes traffic to and from you. Here is what your IP reveals, what it does not, and when you should actually care about it.

IPv4 gave the internet about 4.3 billion addresses — and we ran out. IPv6 fixes that with a number so large it is hard to picture. Here is how the two standards actually differ.

A speed test reports three numbers — download, upload, and ping — but most people only look at one. Here is how to read a speed test result and what to do if the numbers are disappointing.

Your browser sends far more information to every website you visit than most people realize — from your operating system to your screen size. Here is what a User-Agent string exposes and why it matters for privacy.

HD, Full HD, 4K, Retina — display marketing terms pile up fast. Here is what screen resolution actually measures, how it relates to aspect ratio and DPI, and why the same resolution can look different on two screens.

UPC, EAN, Code 128, QR — not all barcodes are interchangeable. This guide breaks down the most common barcode formats, what each one is built for, and how to pick the right one for your product or workflow.

Adding custom colors and branding logos to your QR codes can dramatically increase scan rates. Here is how to design beautiful, high-performing QR codes without breaking scan reliability.

QR codes come in two types: static and dynamic. Learn the key differences between them, how destination redirect tracking works, and how to select the right type for your project.

Print business cards are making a high-tech comeback. Learn how to embed a digital contact card (vCard) directly into a QR code so clients can save your contact details in a single scan.

Want to create a custom QR code for your website, Wi-Fi network, or business card? Follow this comprehensive, step-by-step guide to design, style, and export a high-performing QR code using Toolio's Free QR Code Generator.