Reference & Cheat Sheets
Fast, searchable lookup tables for the values you reach for again and again — status codes, character sets, symbols, and more. No ads cluttering the data, no digging through documentation. Bookmark the ones you use and come straight back.
HTTP Status Codes: The Complete Reference
Every HTTP status code with its meaning, grouped by class (1xx–5xx) — from 200 OK and 301 Moved Permanently to 404 Not Found and 500 Internal Server Error.
HTML Entities Reference: Symbols, Arrows & Special Characters
A searchable table of HTML entities — named and numeric codes for symbols, arrows, currency, math, punctuation, and accented characters you can copy and paste.
ASCII Table: Decimal, Hex, and Character Reference
The full ASCII table — all 128 characters with their decimal, hexadecimal, and binary values, control codes, and printable symbols, in one searchable list.
Regex Cheat Sheet: Regular Expression Syntax Reference
A searchable regular-expression reference — character classes, anchors, quantifiers, groups, lookarounds, and flags, each with a plain-English meaning and example.
Cron Expression Reference: Syntax and Common Schedules
How cron schedules work — the five fields, the special characters, and a table of ready-to-use cron expressions for the schedules you actually need.
MIME Types Reference: Content Types by File Extension
A searchable list of common MIME types (media types) and the file extensions they map to — for text, images, audio, video, fonts, archives, and documents.
CSS Named Colors: All 148 Colors with HEX and RGB
Every CSS named color with a swatch, HEX, and RGB value — searchable and copy-friendly, from aliceblue to yellowgreen.
Data Storage Units: Bytes, KB, MB, GB (and KiB vs KB)
What bits, bytes, kilobytes, megabytes, and gigabytes really mean, the difference between decimal (KB) and binary (KiB) units, and a conversion reference.
Markdown Syntax Cheat Sheet
A quick reference for Markdown — headings, bold, italic, links, images, lists, code, blockquotes, tables, and more, with the exact syntax to copy.
Git Commands Cheat Sheet: The Commands You Actually Use
A practical Git reference — the everyday commands for staging, committing, branching, merging, remotes, undoing changes, and inspecting history.
HTTP Headers Reference: Request and Response Headers
A searchable list of common HTTP headers — Content-Type, Authorization, Cache-Control, CORS, cookies, security headers, and more — with what each one does.
CSS Units Reference: px, em, rem, %, vw, vh and More
Every CSS length unit explained — absolute units like px, relative units like em/rem, viewport units (vw/vh), and when to use each for responsive layouts.
Common Regex Patterns: Email, URL, Phone and More (Copy-Paste)
Ready-to-use regular expressions for the things you match most often — email addresses, URLs, IP addresses, dates, hex colors, slugs, and phone numbers.
SQL Cheat Sheet: The Statements You Use Every Day
A practical SQL reference — SELECT, WHERE, JOINs, GROUP BY, INSERT/UPDATE/DELETE, and schema commands — the core statements for querying and changing data.
HTML Tags Reference: Every Common Element by Category
A searchable list of HTML elements grouped by purpose — structure, text, links and media, lists, forms, tables, and semantic sectioning — with what each does.
UTC Time Zone Offsets: A Reference From UTC-12 to UTC+14
A reference of UTC offsets with example cities and regions — including the half-hour and 45-minute offsets — to make sense of time zones at a glance.
HTTP Methods Reference: GET, POST, PUT, DELETE and More
What each HTTP method does — GET, POST, PUT, PATCH, DELETE, HEAD, OPTIONS — plus which are safe, idempotent, and cacheable, in one quick reference.
Escape Sequences Reference: \n, \t, \\ and String Escapes
Common string escape sequences across languages — newline, tab, quotes, backslash, Unicode escapes — and what each one represents.
JavaScript Array Methods Cheat Sheet
The array methods you use most in JavaScript — map, filter, reduce, find, includes, sort, and more — with what each returns and whether it mutates.
CSS Flexbox Cheat Sheet: Properties and Values
A quick reference for CSS Flexbox — the container and item properties (justify-content, align-items, flex, gap) with the values each one accepts.
ISO Country Codes: All ISO 3166-1 Alpha-2 Codes
A searchable list of every ISO 3166-1 alpha-2 country code (US, GB, KR, JP…) with the country name — the two-letter codes used in domains, locales, and data.
Essential Keyboard Shortcuts (Windows & Mac)
The everyday keyboard shortcuts worth memorizing — copy, paste, undo, find, switch apps, and more — side by side for Windows and macOS.
Looking to actually transform something rather than look it up? Head to the RunWebTools tools or read our guides.