Quick reference tables for ASCII, HTML entities, regex, keyboard codes, and cheatsheets.
Developer reference tools provide instant access to the lookup tables, code charts, and cheatsheets you constantly need but can never memorize. This collection includes ASCII code tables, HTML entity references, regex syntax cheatsheets, keyboard event code lookups, HTTP method references, and more. Instead of searching Google and clicking through blog posts to find a single value, get the answer directly. These references are searchable and filterable, making them faster than static documentation. Especially useful during debugging, code review, or when you need to quickly verify a character code, entity name, or regex metacharacter.
Popular in Developer Reference
Full ASCII table with decimal, hex, octal, and character values
Free online ASCII table reference. Browse all 128 ASCII characters with decimal, hexadecimal, octal, and character values. Searchable and sortable.
Searchable HTML entities table
Free online HTML entities reference. Browse and search HTML character entities by name, number, or character. Includes all standard HTML entities.
Regex syntax quick reference
Free online regex cheatsheet. Quick reference for regular expression syntax including anchors, quantifiers, character classes, groups, lookahead, and lookbehind.
All Developer Reference
Full ASCII table with decimal, hex, octal, and character values
Searchable HTML entities table
Regex syntax quick reference
CSS selectors reference with examples
All named HTML/CSS colors with hex values and preview
Press any key to see its keyCode, key, and code values
Browse Unicode blocks and characters
All HTML5 tags with descriptions and categories
CSS units reference (px, em, rem, vw, vh, %, etc.)
Common Git commands organized by workflow
SQL syntax quick reference
Bash/shell commands quick reference
Look up any HTTP error code with explanation
Cron syntax quick reference with examples
Vim commands organized by mode
Emmet abbreviation quick reference
Docker & Docker Compose commands quick reference
Type a status code number for instant explanation
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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.