Reference Tables
Eight filterable lookup tables covering character encoding, the web platform and CSS — generated from data so the values are complete and consistent.
All reference tables
Lookup tables built from data rather than typed by hand, so the values are consistent and complete. Every table is filterable — type in the filter box to narrow hundreds of rows to the one you need.
ASCII Table
The complete ASCII character set with decimal, binary, hex, octal and HTML values.
Binary Conversion Chart (0-255)
Every value from 0 to 255 in binary, decimal, hexadecimal, octal and ASCII.
HTML Entities Reference
Named and numeric HTML character references with copy-ready code.
Unicode Blocks Reference
Unicode planes and blocks with code point ranges and UTF-8 byte lengths.
HTTP Status Codes
Every HTTP response code, what it means and how it affects SEO.
MIME Types Reference
Common media types mapped to file extensions and typical usage.
Regex Cheat Sheet
Regular expression syntax, character classes, quantifiers and lookarounds.
CSS Named Colors
All 148 CSS colour keywords with HEX, RGB and HSL values.
Which table do I need?
| You are looking for… | Go to |
|---|---|
| The code for a character, or what a control character does | ASCII Table |
| A value in binary, hex and octal at once | Conversion Chart |
| How to write a symbol in HTML | HTML Entities |
| Which script a code point belongs to, or its UTF-8 byte count | Unicode Blocks |
| What a 3xx or 4xx response means for SEO | HTTP Status Codes |
| The right Content-Type for a file | MIME Types |
| Regex syntax you half remember | Regex Cheat Sheet |
| A CSS colour keyword and whether text will be readable on it | CSS Named Colors |
For definitions rather than values, see the glossary. For explanations, see the guides.