Practical, no-fluff guides on the stuff our free tools help you do — JSON, encoding, passwords, regex and more.
Cross out text anywhere with Unicode strikethrough. Step-by-step for Instagram, WhatsApp, Discord, Slack, Google Docs and Notion, plus when to use native formatting.
Read article →Convert English text to binary by hand or instantly online. ASCII codes, UTF-8 multi-byte characters, worked examples and how to decode binary back to text.
Read article →How Discord text formatting really works — markdown for messages, Unicode fonts for names and bios, what breaks search, and which styles render on every device.
Read article →How Roman numerals work: the seven symbols, additive and subtractive rules, year conversions like MMXXVI, and the errors that trip people up.
Read article →What size should your QR code be? What error correction level to pick? A practical guide to designing QR codes that actually scan — on business cards, posters, and packaging.
Read article →Spaces, +, &, #, and non-ASCII characters break URLs unless encoded correctly. Learn what percent-encoding actually does, when to use encodeURI vs encodeURIComponent, and copy-paste examples.
Read article →MD5 is fast but broken. SHA-256 is the modern default. Here's when to use each hash, how they compare, and what to pick for passwords, file checksums, and API signatures.
Read article →Count tokens for GPT, Claude and Gemini: words-to-tokens conversion table, per-model cost math, and five ways to cut your AI token bill without hurting quality.
Read article →Every regex pattern you actually need — anchors, character classes, quantifiers, groups, lookarounds — with copy-paste examples for JavaScript, Python and grep.
Read article →Compare two texts online without uploading them. Line, word and character diff explained, a mode-picker table, and how to diff JSON, PDFs, CSV and code cleanly.
Read article →How long a password should be in 2026, with a length-vs-crack-time chart, entropy math, passphrase comparison and a free in-browser generator.
Read article →Base64 in one plain-English guide: how it works, when to use it, when NOT to, and how to encode and decode it in every major language.
Read article →Learn every practical way to format, pretty-print, indent, and validate JSON in JavaScript — with copy-paste examples for Node.js and the browser.
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