Reference & Lookup Tools
Comprehensive technical references, standard lookups, and developer cheatsheets: MIME types, HTTP status codes & methods, HTML entities, Unicode, emojis, ISO country/currency/language codes, time zones, CSS units, and measurement conversions. All tools run 100% in your browser with zero server uploads and instant processing.
MIME Type & Media Type Lookup
Search IANA media types, file extensions, and Content-Type HTTP headers with charset specifications
HTTP Status Code Lookup & Reference
RFC 9110 HTTP status codes directory with troubleshooting guides, cacheability, and browser behaviors
HTTP Method Reference & REST Verbs Guide
RFC 9110 HTTP request methods matrix with safety, idempotency, caching, and REST best practices
HTML Entity Lookup & Character Encoder
W3C HTML5 named character references, decimal codes, hex escapes, and interactive encoder
Unicode Lookup & Character Inspector
Inspect any character or code point: U+XXXX hex, UTF-8 bytes, UTF-16 surrogates, and block names
Emoji Lookup & Unicode Search
Search Unicode 15.1 emojis by name, keyword, and shortcode with 1-click clipboard copy
CSS Color Code Reference & Contrast Checker
W3C CSS Color Module Level 4 named colors with HEX, RGB, HSL, and WCAG contrast scoring
ISO Country Code Lookup (ISO 3166-1)
ISO 3166-1 Alpha-2, Alpha-3, numeric codes, national flags, calling codes, and capitals
ISO Currency Code Lookup (ISO 4217)
ISO 4217 world currency codes, symbols, numeric identifiers, and decimal subdivisions
ISO Language Code Lookup (ISO 639)
ISO 639-1 and 639-2 language codes, native autonyms, text direction, and language families
Global Time Zone Lookup & Offset Guide
Interactive time zone lookup indexed by UTC offsets, abbreviations, and live digital clocks
IANA Time Zone Database & Intl Helper
Canonical IANA tz database identifiers (Olson database) with JavaScript Intl code generators
File Extension Lookup & Magic Bytes Directory
Search file extensions, format specifications, developer organizations, and magic byte signatures
CSS Unit Reference & Live Calculator
W3C CSS Values and Units Level 4 cheatsheet with interactive px/rem/em/vw converter
Measurement Reference & SI Metric Prefixes
BIPM International System of Units (SI) cheatsheet, metric prefixes (quecto to quetta), and unit converter
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