About HTML Entity Encoder & Decoder — Convert Special Characters
html encoder — User-submitted text that contains unencoded angle brackets becomes executable HTML — a <script> tag in a comment field can hijack sessions and steal credentials. Entity encoding converts these dangerous characters into harmless display equivalents (< renders as < without being interpreted as markup). This tool encodes the five critical characters (<, >, &, ", ') and decodes both named entities like & and numeric references like < back to their original characters — essential for reading encoded email templates, debugging CMS output, and preparing code snippets for blog display.
How to Use This Tool
Follow these simple steps to get accurate results in seconds. The whole process takes less than a minute for most inputs.
- 1
Paste Your HTML or Encoded Text
Paste the content containing special characters you want to encode, or paste HTML entity references you want to decode back to their original characters.
- 2
Choose Encode or Decode
Select the encode operation to convert characters like angle brackets, ampersands, and quotes into safe HTML entities, or select decode to reverse entity references back to their original characters.
- 3
Review the Converted Output
Check the output panel to verify the conversion is correct. For encoding, confirm that all special characters were converted. For decoding, ensure that entity references were properly resolved.
- 4
Copy the Result for Your Project
Copy the encoded output to embed safely in HTML documents, email templates, or CMS fields, or copy the decoded output for text editing and search operations.
How It Works
The technical details of how this tool processes your input and produces accurate results.
Character-by-Character Encoding Scan
The encoder scans your input text character by character, checking each one against the set of characters that have special meaning in HTML: <, >, &, ", and '. When a matching character is found, it is replaced with its corresponding named entity — < becomes <, > becomes >, & becomes &, " becomes ", and ' becomes '. All other characters pass through unchanged.
Entity Reference Resolution During Decoding
The decoder identifies entity references in your text using a regular expression that matches both named entities (like &) and numeric references (like < or <). Named entities are resolved against a lookup table of the 252 standard HTML entity names. Numeric references are converted by parsing the decimal or hexadecimal code point and using String.fromCodePoint() to produce the corresponding Unicode character.
Double-Encoding Detection
The decoder can identify and resolve double-encoded entities like &lt; which decode to < on the first pass and then to < on the second. This is particularly useful when migrating content between CMS platforms that apply entity encoding at different layers, producing output that displays visible entity references instead of the intended characters.
Key Features
Built to handle real workflows quickly and accurately. Each feature solves a specific problem you'd otherwise need multiple tools or manual steps to address.
Encode and Decode in One Tool
Switch between encoding special characters into safe HTML entity references and decoding entity references back to their original characters, handling both operations in the same interface.
Named and Numeric Entity Support
Processes both readable named entities like & and < as well as decimal and hexadecimal numeric entities like & and &, covering the full range of HTML entity representations.
Batch Text Processing
Paste an entire paragraph or code snippet and every special character is encoded or decoded at once — no need to process characters individually or run multiple passes.
XSS-Safe Output
Encoding converts angle brackets and script delimiters into harmless entity references, closing the attack vector for cross-site scripting when user-generated content is embedded in web pages.
Email Template Compatibility
Produces encoded output safe for strict HTML email parsers where unencoded ampersands and angle brackets cause rendering failures across email clients like Outlook and Gmail.
Benefits of Using HTML Entity Encoder & Decoder — Convert Special Characters
Why this tool matters and how it improves your daily work.
XSS Prevention That Actually Works
A comment containing <script>alert(document.cookie)</script> executes in the browser if rendered unencoded. Encoding the angle brackets to <script> turns the attack into harmless text that displays literally instead of executing.
Blog Code Snippets Display as Text, Not Markup
Pasting <div class="header"> into a blog post causes the browser to render it as an actual div element. Encoding it to <div class="header"> makes the code visible as text exactly as you wrote it.
Named and Numeric Entity Coverage for Every Character
Named entities like © are readable in source code, but they only exist for ~250 characters. Numeric entities like € work for every Unicode character including emojis, mathematical symbols, and CJK characters that have no named equivalents.
Batch Processing Handles Entire Documents
Paste a 50-line email template or a full code block and every special character is encoded at once. No need to find and replace each instance individually or run multiple passes for different characters.
Common Use Cases
Real scenarios where this tool saves time and produces better results than manual methods.
XSS Prevention in User-Generated Content
Encode user-submitted text before rendering it in HTML to prevent cross-site scripting attacks. A profile bio containing <img onerror=alert(1) src=x> becomes harmless text when angle brackets are entity-encoded.
Code Snippet Display in Blog Posts
Encode HTML code examples for display in blog posts and documentation so that <article> tags in the examples appear as readable text rather than being interpreted and rendered as actual page elements.
Email Template Debugging
Decode HTML entity strings in email templates like &lt;div&gt; to reveal the original characters, making it easier to read and edit template source code that has been entity-encoded for Outlook and Gmail compatibility.
RSS Feed and XML Content Preparation
Encode special characters in XML and RSS feed content where unescaped ampersands and angle brackets break well-formedness, causing feed validators to reject the entire feed.
Who Uses This Tool
Frontend Developers
encoding user-generated content before rendering it in HTML to prevent XSS attacks by ensuring that script tags and special characters are converted to harmless entity references
Email Template Builders
encoding special characters in HTML email templates that use strict parsers, where unencoded ampersands and angle brackets can cause rendering failures across email clients
Technical Bloggers
encoding code snippets for display in blog posts so that HTML tags in the examples are shown as text rather than being interpreted and rendered by the browser as actual page elements
Pro Tips
Practical advice to get the most out of this tool, based on how experienced users actually work with it.
Always encode user-generated content before inserting it into HTML. Unencoded angle brackets in comments or profile fields allow attackers to inject script tags, leading to cross-site scripting vulnerabilities that can compromise other users' accounts.
When writing blog posts that include code examples, encode the entire code block. This prevents the browser from treating example HTML tags as real markup, ensuring your code samples display exactly as typed rather than being rendered as page elements.
Use the decoder when migrating content between systems that handle HTML entities differently. Some CMS platforms double-encode entities, producing text like &amp; which decodes to & instead of the intended & character. Running the decoder reveals the actual content.
Frequently Asked Questions
Quick answers to the most common questions about this tool. If your question isn't here, contact our support team.