Toolk Blog
Practical explanations with worked examples, source links, and direct paths to the browser tools used in each workflow.
A Unix timestamp counts seconds since 1970-01-01T00:00:00 UTC, ignoring leap seconds. Learn seconds vs milliseconds, the Year 2038 problem, and conversion.
px is an absolute pixel, em is relative to the element's own font-size, rem is relative to the root. Default to rem for accessibility — here is why and when.
The SEO title and meta description shape your SERP result; Open Graph and Twitter Card tags control how your link looks on Facebook, LinkedIn, X, and Slack.
Learn Markdown syntax from the portable CommonMark core to GFM tables, task lists, and strikethrough, including blank-line rules that prevent rendering bugs.
A JWT is three Base64URL parts joined by dots — header.payload.signature. The first two are readable by anyone; the signature makes it tamper-evident.
JSON for APIs and data interchange, YAML for human-edited config, XML for documents and enterprise. The exact tradeoffs, footguns, and conversion gotchas.
A strong password is long, random, and unique. Compare password entropy, passphrases, reuse risk, and the final NIST SP 800-63B-4 requirements.
Calculate any mortgage payment by hand with the amortization formula M = P·[r(1+r)^n]/[(1+r)^n−1]. Full worked example, PITI breakdown, and rate tables inside.
HEX and RGB are the same sRGB color in different notation, HSL is a human-friendly transform, and OKLCH is perceptually uniform. Here is when to use each.
Compare hashing, encryption, and encoding by purpose, reversibility, keys, and security. See exact use cases, common mistakes, and standards-backed examples.
Convert CSV to JSON without corrupting data: how to handle quoting, delimiters, type inference, and nesting, plus a worked round-trip showing what survives.
The 7 JSON errors that break parsers every day — trailing commas, single quotes, unquoted keys, comments, bad brackets, wrong types — with the exact fix.
A practical map of 20 browser-based developer tools for formatting, conversion, debugging, security, CSS, and web metadata, with limits and source standards.
How to validate and format JSON correctly: RFC 8259 syntax rules, common parser errors, schema checks, and formatting defaults that keep API diffs clean.
Use browser-based text tools to draft, count, clean, structure, and publish content. This practical workflow covers privacy, limits, and useful SEO checks.
Learn how Base64 converts bytes to text, why it adds about 33% overhead, when URL-safe encoding matters, and why Base64 provides no encryption or secrecy.