These technical collections are the map underneath the task-first directory. Open one when you know the format or system you are working with.
Clean, compare, count, and transform everyday text.
Write, preview, convert, lint, and export Markdown.
Format, validate, compare, and convert structured JSON.
Format, validate, minify, and convert XML documents.
Format, validate, and convert readable YAML data.
Review, clean, and convert tabular data.
Format, minify, and safely preview HTML.
Format CSS and build polished visual values.
Format JavaScript and test regular expressions.
Convert Base64, URL, HTML, Unicode, binary, and hex.
Generate, inspect, hash, and compare values locally.
Generate IDs and look up common web protocol values.
Convert, generate, and evaluate accessible color systems.
Compress, resize, crop, convert, and optimize images locally.
Merge, split, rotate, extract, and create PDF documents.
Compare dates, convert timezones, and calculate schedules.
Calculate percentages, payments, tax, and formatted values.
Generate metadata and crawler-ready site files.
Review search snippets, content, robots, and structured data.
Parse, build, edit, and inspect URLs and query strings.
Create codes, random values, and fair decisions.