Which entity forms are supported?

Both decimal numeric entities like A and hexadecimal numeric entities like A (case-insensitive on the "x" and hex digits) are accepted.

Are named entities like & supported?

No, only numeric entities. Named entities like & or don't directly encode a code point in their text and would need a lookup table instead.

What happens with an invalid entity?

The line is rejected with an error explaining it isn't a valid numeric HTML entity.

Does this reject surrogate code points?

Yes, entities that decode to a value in the UTF-16 surrogate range (0xD800-0xDFFF) are rejected, since those aren't valid standalone code points.

HTML Entity to Integer Converter

Overview

Introduction

This tool reverses numeric HTML character references, whether written in decimal (A) or hexadecimal (A) form, back into their plain integer Unicode code points.

It's useful when you have markup or text containing entities and want to know exactly which characters they represent.

What Is HTML Entity to Integer Converter?

A converter that takes a list of numeric HTML entities, one per line, and outputs the integer code point each one represents.

It accepts both the decimal (&#N;) and hexadecimal (&#xHHH;) numeric entity syntaxes defined by HTML and XML.

How HTML Entity to Integer Converter Works

Each line is matched against a pattern recognizing either &#digits; or &#xhexdigits; (case-insensitive).

The numeric portion is parsed with the appropriate radix (10 for decimal, 16 for hex) to get the code point.

The result is validated against the full Unicode range and checked to exclude the UTF-16 surrogate band before being reported.

When To Use HTML Entity to Integer Converter

Use it to decode entities found in HTML/XML source, such as when debugging garbled or escaped text.

It's also useful for confirming exactly which character a given entity represents.

Often used alongside Integer to HTML Entity Converter and Integer URL Decoder.

Features

Advantages

Handles both decimal and hexadecimal numeric entity syntaxes in the same input list.
Validates the decoded code point range, catching malformed or invalid entities.

Limitations

Doesn't support named entities (like & or ©); only the numeric forms.
Requires the full entity syntax including the leading &# and trailing semicolon.

Examples

Decimal entity

Input

&#65;

Output

Hexadecimal entity

Input

&#x41;

Output

Best Practices & Notes

Best Practices

If your source text mixes named and numeric entities, convert named ones to numeric form first (or strip them) before using this tool.

Developer Notes

A single regular expression, `/^&#(x[0-9a-fA-F]+|[0-9]+);$/`, captures both entity forms in one pass, and the captured group's leading "x"/"X" determines whether `parseInt` is called with radix 16 or 10.