VSM
VSM
VIEN

HTML Encoder/Decoder

Encode and decode HTML entities

🔒 HTML Encoding

HTML encoding chuyển đổi các characters đặc biệt thành HTML entities để hiển thị an toàn trên web và ngăn chặn XSS attacks.

< → &lt;
> → &gt;
& → &amp;
" → &quot;

HTML Encoder & Decoder Online

An HTML encoder and decoder converts characters like <, >, &, and quotation marks into their safe HTML entity equivalents — and reverses the process just as quickly. Whether you are embedding code snippets in a blog post, sanitizing user input, or debugging an API response full of entities, this tool handles both directions instantly in your browser.

Benefits of the HTML encoder & decoder

  • Prevents broken page layouts by converting < > & " ' into entities the browser will display literally rather than interpret as markup.
  • Mitigates XSS (Cross-Site Scripting) attacks by neutralizing injected script tags before they ever reach the DOM.
  • Lets you store or transmit raw HTML safely inside JSON payloads, database fields, and email templates without parser conflicts.
  • Instantly decodes long entity strings — turning &lt; back into readable source text in one click.
  • Runs entirely client-side: no data leaves your machine, no account required, and no rate limits.

Use cases for HTML encoding & decoding

  • Publishing code examples inside 
     or  blocks without the browser rendering angle brackets as actual tags.
  • Sanitizing user-generated content before storing it in a database and rendering it back on a page.
  • Composing HTML emails where certain clients expect special characters to be entity-encoded for safe rendering.
  • Decoding webhook or API responses that return entities like " instead of plain quotes, making the payload human-readable again.
  • Preparing attribute values — such as alt or title — that contain apostrophes, quotes, or ampersands.
  • Auditing CMS-generated content to check whether entities have been double-encoded accidentally.

How to use the HTML encoder & decoder

  1. Paste or type your text into the input box — it can be raw HTML with special characters, or a string already full of entities like & and <.
  2. Select Encode to convert special characters into HTML entities, or Decode to convert entities back into their original characters.
  3. The result appears instantly in the output box — click Copy to grab the processed text and use it wherever you need it.

Frequently asked questions

What is the difference between HTML encoding and URL encoding? HTML encoding replaces special characters with named or numeric HTML entities (e.g., <) for safe use inside HTML documents. URL encoding uses percent notation (e.g., %3C) for safe use inside web addresses. The two formats are not interchangeable.

Does this tool handle Unicode and non-ASCII characters? Yes. The encoder and decoder fully support Unicode, so you can safely process text in any language — including accented, CJK, and emoji characters — without garbling the output.

Why do I see & instead of & in my result? This happens when the input already contains HTML entities and you encode it again, causing double-encoding. Run the text through Decode first to restore the original characters, then re-encode from that clean baseline if needed.

Is my input stored or logged anywhere? No. All encoding and decoding happens directly in your browser using JavaScript. Nothing is sent to any server, so sensitive content you paste here stays completely private.