HTML Entity Encoder
Encode special characters to HTML entities and decode them back, instantly in your browser. Prevents XSS vulnerabilities from unescaped user input. No account needed — works instantly in your browser.
HTML Entity Encoder / Decoder
Safely convert special characters like < and > into HTML entities (or vice versa).
1. Raw Text / HTML Source
2. Encoded Result
Result will appear here
What is an HTML Entity?
An HTML entity is a string beginning with & and ending with ; that represents a special character in HTML — & for &, < for <, > for >, for a non-breaking space. Entities prevent the browser from interpreting characters as HTML markup, so they display as literal text rather than being parsed as code.
An HTML entity encoder takes raw text containing those special characters and converts them to their entity equivalents, making the text safe to insert into HTML. A decoder reverses the process — converting entity sequences back to the characters they represent. Both operations run entirely in your browser using the native DOMParser API, so no text is ever transmitted to a server.
How to Use the HTML Entity Encoder
- Choose encode or decode — select the direction: encode to convert raw text to HTML entities, or decode to convert entities back to readable text.
- Paste your text — enter any string containing special characters, HTML snippets, or entity sequences in the input field.
- Review the output — the encoded or decoded result appears instantly; all five critical characters (&, <, >, ", ') are handled automatically.
- Copy the result — click the copy button to grab the output string, ready to paste directly into your HTML, template, or code.
Who Is This For?
- Developers building web apps who need to safely render user-submitted content without XSS vulnerabilities — encoding input before it reaches the DOM is the first line of defense.
- Content editors cleaning up pasted text with special characters like curly quotes, em dashes, copyright symbols, or accented letters that break HTML rendering.
- Anyone debugging HTML rendering issues caused by unescaped characters appearing as broken markup, missing content, or garbled layout in the browser.
Key Benefits
- Privacy — encoding runs entirely in your browser using the native DOMParser API; no text is sent to a server.
- Free — no account, no subscription, no character limits.
- No account required — paste and encode immediately with no setup.
- XSS prevention education — the tool demonstrates exactly how escaping neutralizes attack vectors like
<script>injections by showing the before and after side by side.
Common Use Cases
Sanitizing user-submitted form input before inserting it into an HTML template to prevent XSS. Preparing HTML content to include inside a JSON string, where raw angle brackets would break the JSON parser. Debugging a CMS that is double-encoding or incorrectly decoding HTML entities — paste the problematic string to decode it and inspect the result. Converting text with special characters (©, ™, é) to entities for use in HTML email templates where character encoding is inconsistent across email clients.
Frequently Asked Questions
What is an HTML entity? ↓
An HTML entity is a string beginning with & and ending with ; that represents a special character in HTML — & for &, < for <, > for >, for a non-breaking space. Entities prevent the browser from interpreting characters as HTML markup so they display as literal text rather than being parsed as code.
Is this HTML entity encoder free? ↓
Yes, completely free. The encoder runs entirely in your browser using the native DOMParser API — no server, no account, no character limits. Your text never leaves your device.
Why do I need to encode HTML entities? ↓
If you inject user-provided text into HTML without encoding, a user who types <script> could execute JavaScript in your page — this is a Cross-Site Scripting (XSS) vulnerability. Always encode user input before inserting it into HTML. Entity encoding converts dangerous characters into their harmless entity equivalents so the browser displays them as text instead of executing them as code.
What is the difference between HTML encoding and URL encoding? ↓
HTML encoding makes text safe to display in HTML by escaping markup characters (&, <, >, ", '). URL encoding makes text safe to include in a URL by replacing unsafe characters with percent-encoded sequences like %20 for a space. They are different standards for different contexts — you need HTML encoding when inserting text into an HTML document, and URL encoding when constructing query strings or path segments.
Which characters must always be encoded in HTML? ↓
The five critical characters: ampersand (&), less-than (<), greater-than (>), double quote ("), and single quote ('). These are the characters the browser uses to interpret HTML structure, so leaving them unescaped can break your layout or create XSS vulnerabilities when used inside attribute values or element content.
Is it safe to decode potentially malicious strings using this tool? ↓
Yes. This tool uses the native DOMParser API rather than an innerHTML assignment to decode entities, so decoding a malicious XSS payload will not execute any JavaScript in your browser session. You can safely inspect and debug suspicious entity-encoded strings here without risk.
The tools and calculators provided on The Simple Toolbox are intended for educational and informational purposes only. They do not constitute financial, legal, tax, or professional advice. While we strive to keep calculations accurate, numbers are based on user inputs and standard assumptions that may not apply to your specific situation. Always consult with a certified professional (such as a CPA, financial advisor, or attorney) before making significant financial or business decisions.
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