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☰Developer Reference

// Quick reference tables for ASCII, HTML entities, regex, keyboard codes, and cheatsheets.

18 tools available

Full ASCII table with decimal, hex, octal, and character values

HTML Entities Reference

Searchable HTML entities table

Regex Cheatsheet

Regex syntax quick reference

CSS Selectors Reference

CSS selectors reference with examples

HTML Color Names

All named HTML/CSS colors with hex values and preview

Keyboard Keycodes

Press any key to see its keyCode, key, and code values

Browse Unicode blocks and characters

HTML Tags Reference

All HTML5 tags with descriptions and categories

CSS Units Reference

CSS units reference (px, em, rem, vw, vh, %, etc.)

Common Git commands organized by workflow

SQL syntax quick reference

Bash Cheatsheet

Bash/shell commands quick reference

HTTP Error Lookup

Look up any HTTP error code with explanation

Cron Cheatsheet

Cron syntax quick reference with examples

Vim commands organized by mode

Emmet Cheatsheet

Emmet abbreviation quick reference

Docker Cheatsheet

Docker & Docker Compose commands quick reference

Status Code Finder

Type a status code number for instant explanation

#About Developer Reference

Quick reference tables for ASCII, HTML entities, regex, keyboard codes, and cheatsheets. All tools in this category run entirely in your browser with no server-side processing. Your data stays on your device.

Each tool is designed for speed and simplicity. Paste your input, configure options if needed, and copy the result with one click. No sign-up, no installation, no limitations.