Guides
Long-form notes written against the tools on this site: the arithmetic behind password strength, what Base64 really does, how to read a JSON parser's complaint, and why word counters disagree. Each one is written by the person who maintains these tools, and every number in them was computed rather than quoted.
Password Entropy: What “Strong” Actually Measures
The H = L × log2(N) arithmetic, the pool-by-length table, why length beats symbols, and what the standards stopped recommending.
Base64 Is Encoding, Not Encryption
A byte-by-byte worked example, the closed-form length formula, the UTF-8 trap that makes btoa throw, and URL-safe alphabets.
The JSON Errors You Actually Hit
Sixteen real inputs run through a real parser with the exact messages, plus the two failures that never raise an error at all.
Why Two Word Counters Disagree
Six counting rules measured over six awkward texts — hyphens, markdown, URLs, CJK — and which number to trust for which contract.
About these pages
They are documentation, not SEO filler. Where a guide describes a tool on this site, the description was read out of that tool's own source rather than inferred from its interface, and the computed tables can be regenerated with the snippets published inside each article. Corrections are welcome through the contact page and are dated when applied.
Written and maintained by CHENYUWEN. First published 2026-10-30. If something here is wrong, tell us - corrections are dated on the page.