🌐 HTML Encoder & Decoder
Convert special HTML characters (like <, >, &) into safe HTML entities, or decode entities back into characters. Prevents rendering issues and XSS.
What This Tool Does
This tool encodes and decodes HTML entities. Paste text with special characters and it converts them into their safe HTML entity form; paste encoded text full of entities and it decodes it back to readable characters. It is an everyday helper for web developers handling content that needs to display correctly on a page without breaking the HTML around it.
Certain characters have special meaning in HTML, so when you want them to appear as literal text rather than be interpreted as markup, they must be encoded. This tool handles that conversion both ways, saving you from doing it by hand and from the display bugs and security issues that incorrect encoding can cause.
How HTML Encoding Works
HTML uses certain characters structurally — the angle brackets that wrap tags, the ampersand that begins entities, and quotation marks around attributes. If you want one of these to appear as actual text on the page, you cannot just type it, because the browser would try to interpret it as markup. Instead you use an HTML entity: the less-than sign becomes <, the greater-than sign >, the ampersand &, and quotation marks have their own entities too.
Decoding reverses this, turning entities back into the characters they represent. The need arises constantly because text frequently contains these special characters — think of displaying code on a page, showing a mathematical expression with angle brackets, or rendering user-submitted text that might contain any character. Encoding ensures the characters display as intended rather than disrupting the page, while decoding lets you read or process encoded content. Getting this right is what keeps content displaying correctly and safely.
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Why HTML Encoding Matters for Display and Security
The most visible reason to encode is correct display. If you want to show a snippet of HTML code on a web page — say, in a tutorial — you must encode the angle brackets, or the browser will try to render the code as actual elements instead of showing it as text. The same applies to any content containing characters that HTML treats specially: encoding them ensures they appear exactly as written rather than corrupting the surrounding page structure.
There is also an important security dimension. When a web application displays text that came from users, failing to encode it properly can open the door to cross-site scripting, where malicious input containing script tags gets executed by the browser instead of being shown as harmless text. Encoding user-supplied content before displaying it is a core defensive practice that neutralizes this risk by ensuring any special characters are treated as text, not markup. While frameworks often handle this automatically, understanding HTML encoding — and being able to encode or decode content directly — remains a genuinely useful part of web development.
Quick Tips
- Encode angle brackets when you want to display HTML code as text rather than have it render.
- The key entities are < for <, > for >, and & for & — the characters HTML treats specially.
- Always encode user-submitted content before displaying it, to prevent cross-site scripting.
- Decoding turns entities back into readable characters for reading or processing content.
Frequently Asked Questions
What is HTML encoding?
It is converting characters that have special meaning in HTML — like angle brackets and ampersands — into entity codes such as < and &, so they display as text instead of being interpreted as markup.
Why do I need to encode certain characters?
Because characters like < and > structure HTML. To show them as literal text rather than have the browser treat them as tags, you must encode them as entities. Otherwise the page can break or display incorrectly.
How does encoding relate to security?
Encoding user-submitted content before displaying it prevents cross-site scripting, where malicious input is executed as code. Encoding ensures special characters are treated as harmless text, not active markup.
Is my text safe to paste here?
Yes. All encoding and decoding happen in your browser, so nothing you enter is uploaded or stored. You can work with private content safely.
Private, Instant, and Free
This tool runs entirely in your browser, so anything you encode or decode stays on your device. It works instantly, needs no account or download, and runs anywhere. Like every tool here, it is free to use as often as you need.
Related Tools
For more developer tools, the URL encoder and decoder handles web-address encoding, the Base64 encoder and decoder handles a common data encoding, and the JSON formatter formats JSON.
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