HTML Encoder Decoder | NovaCalculator

Formula

Character ↔ &EntityName; or &#Number;

Maps reserved characters to their corresponding HTML entity codes using the browser's DOM text handling capabilities.

Worked Examples

Example 1: Displaying Code Snippets

Problem: Show '<div>Hello</div>' on a webpage without it rendering as a div.

Solution: Input: <div>Hello</div>\n\nClick 'Encode'\n\nOutput: <div>Hello</div>\n\nResult: Browser displays the tags literally.

Result: Safe for display

Example 2: Fixing Broken Links

Problem: URL contains ampersands: 'site.com?q=1&lang=en'.

Solution: Input: site.com?q=1&lang=en\n\nClick 'Encode'\n\nOutput: site.com?q=1&lang=en\n\nResult: Correctly encoded for use inside an href attribute.

Result: Valid HTML attribute

Example 3: Decoding Entities

Result: Human-readable text

Frequently Asked Questions

What is HTML encoding?

HTML encoding converts characters that have special meaning in HTML (like <, >, &, \") into their corresponding HTML entities (like <, >, &, "). This ensures the browser displays them as text rather than interpreting them as code.

Why do I need to encode HTML?

Encoding is critical for security (preventing Cross-Site Scripting or XSS attacks) and display correctness. If you want to show code snippets on a webpage, you must encode the brackets; otherwise, the browser will try to render the tags instead of showing them.

What is an HTML entity?

An HTML entity is a string of characters beginning with an ampersand (&) and ending with a semicolon (;). It represents a specific character. For example, the copyright symbol © is represented as ©.

Why might my result differ from another tool or reference?

Differences typically arise from rounding conventions, the specific version of a formula (for example, simple vs compound interest), or unit inconsistencies between inputs. Check that both tools are using the same formula variant and the same units. The References section links to the authoritative source behind the formula used here.

How do I get the most accurate result?

Enter values as precisely as possible using the correct units for each field. Check that you have selected the right unit (e.g. kilograms vs pounds, meters vs feet) before calculating. Rounding inputs early can reduce output precision.

What inputs do I need to use HTML Encoder Decoder accurately?

Each field is labelled with the required unit (metric or imperial). Gather your source values before starting — for example, a weight measurement in kilograms, a distance in metres, or a dollar amount — and enter them exactly as measured. The formula section on this page lists every variable and explains what each represents.