What is HTML Entity Encoder & Decoder?
HTML entities represent reserved characters such as ampersands and angle brackets. Encoding text for HTML is different from sanitizing untrusted markup or escaping values for JavaScript, CSS or URLs.
How to use this tool
- Paste the text into the editor.
- Choose Encode or Decode.
- Copy the result into the appropriate HTML text context.
- Use a vetted sanitizer if you intend to allow user-supplied HTML markup.
When HTML Entity Encoder & Decoder is useful
HTML character references allow reserved characters and selected symbols to be represented in HTML text. They are especially familiar for characters such as the ampersand and angle brackets, which have special meaning in markup. Encoding is context-dependent, however. A value safe in an HTML text node may not be safe in an attribute, URL, script or style context.
Prepare the right information first
Paste plain text when you want to represent characters as entities, or paste entity text when you want to inspect the decoded characters. Keep track of where the output will be used. If you are working with user-generated markup, decide whether you need plain text output or a carefully sanitised subset of HTML; those are different tasks.
Review the result before publishing
Inspect the result around ampersands, quotation marks and angle brackets. Copy it into a test page and confirm that the browser displays the intended text rather than interpreting it as markup. Check non-ASCII characters as well, especially when content moves between systems with different encodings.
Mistakes worth avoiding
Do not treat entity encoding as a complete defence against cross-site scripting. It does not validate URLs, sanitise HTML or safely escape JavaScript and CSS. A common error is encoding content twice, which can cause visible entity strings to appear on the page. Use the output only in the context for which it was prepared.
A practical workflow
For normal application development, prefer your framework’s automatic escaping and trusted sanitisation libraries. This utility is useful for inspecting snippets, preparing examples and understanding how reserved characters are represented. Keep source text separate from encoded output so you can update content without decoding it by hand.
What this tool does not do
The tool handles text conversion in the browser and does not inspect the security of an application. Entity support and parsing can vary by context, so never use this result as the only security review for user-supplied content.
Using HTML Entity Encoder & Decoder as part of a careful workflow
A useful result is only one step in the wider work of maintaining a website. After using this developer tools utility, keep a note of the page or project it relates to, review the result alongside the surrounding content and confirm that the change fits the way the site is built. For example, a value prepared here may still need to be added through a content management system, checked in a staging environment or compared with the settings produced by an existing plugin. Avoid making several unrelated changes at once. When a result affects a published page, record what changed and check the page again after deployment. This makes it easier to identify the cause if something behaves differently and gives you a clear point to return to if you need to revise the implementation. The purpose of HTML Entity Encoder & Decoder is to make one defined task easier, while the final decision remains with the person responsible for the website. If the result is part of a client project, explain what was generated and what still needs manual verification before handover. If you are working on your own site, keep the source material and the final published version together so you can compare them later. This small review habit is often more valuable than repeatedly generating a new result without checking the effect of the previous change.
Good practices to keep in mind
- Do not treat entity encoding as a complete security sanitizer.
- Use framework escaping and context-aware output handling.
- Avoid inserting untrusted strings directly into script or style elements.
Frequently asked questions
Does encoding make HTML safe in every context?
No. HTML text, attributes, URLs, JavaScript and CSS have different escaping requirements.
Can it decode named entities?
The decoder handles common named entities and numeric character references supported by the browser.
Does it send data to a server?
No. Encoding and decoding run locally in your browser.
Review generated output before adding it to a live website. Search engines and browsers can change how they interpret web standards, so check important implementations against current official documentation.