Reference Tools

10 tools

Quick-reference lookup tables

Reference tools — look up HTTP status code meanings and RFC references, look up MIME types for any file extension, and calculate chmod permission modes.

10 tools

HTTP Status Codes

Look up the meaning, description, and RFC reference for any HTTP status code.

MIME Type Lookup

Look up the MIME type for a file extension, or the extension for a MIME type.

chmod Calculator

Convert between octal chmod values and symbolic permission strings. Supports setuid (4xxx), setgid (2xxx), and sticky bit (1xxx).

ASCII Table

Browse the full ASCII character table with decimal, hex, octal, binary, and character name. Lookup any character.

Unicode Lookup

Look up Unicode code points. Enter a character, code point (U+1F600), or text to analyze all characters.

CSS Color Names

Browse all 148 CSS named colors, look up a color by name or hex, or find the nearest named color for any hex value.

HTTP Headers Reference

Browse 44 HTTP headers with descriptions and real example values. Filter by category: request, response, security, caching, CORS, or content.

Regex Pattern Library

A curated library of 26 production-ready regex patterns for emails, URLs, IPs, dates, passwords, UUIDs, file paths, and more.

Exit Codes Reference

Browse 33 standard Unix/Linux exit codes: bash conventions, fatal signal codes, and BSD sysexits.h. Search by code, name, or meaning.

Git Command Generator

A searchable cheat sheet of 60+ Git commands for branching, undoing mistakes, stashing, rebasing, and remotes, each with a plain-English explanation.