Developer
Advanced QR Codes: WiFi, vCards, and Custom Designs
Learn to create advanced QR codes including WiFi credentials, vCards, custom designs, and understand error correction levels.
Blog
Tips, guides, and tutorials for our free online tools.
Developer
The Essential Developer Toolkit: 10 Must-Have Online Tools
A curated list of essential online developer tools for daily use in 2026, with practical use cases and links to try them out.
Developer
JWT Tokens: What's Inside and How to Decode Them
JWT tokens look like gibberish but they're just base64-encoded JSON. Here's how to read them and a free decoder tool.
Developer
UUID v4: Why It's the Default for Unique IDs
Need a unique ID that won't clash? UUID v4 is the standard. Here's how it works and a free tool to generate them in bulk.
Text
How to Remove Duplicate Lines from Any Text
Got a list with repeats? Here are three ways to strip duplicates — and a free tool that does it in one click.