What HTML Encoder/Decoder helps you do

Encode text so HTML special characters display literally instead of being interpreted as markup, and decode entities back into characters. It uses the browser's own textarea conversion, which escapes ampersands and angle brackets. It is the fix for text that shows as tags or broken characters on a page.

Encoding and decoding happen in your browser; your text is not uploaded to Haivix.

How it works

These tools transform text locally: they parse, format, encode or render a string in your browser. Nothing you paste is uploaded to Haivix, but some tools load a library from a public CDN, so the page needs a network connection and your browser makes that request. The transformations operate on syntax, not meaning: a formatter can make invalid code look tidy, an encoder can hide a value without protecting it, and a preview can render markup that was never meant to execute. Outputs are exact strings, which means line endings, byte order marks and character encoding all matter when you paste the result somewhere else.

How to use HTML Encoder/Decoder

Paste the text or HTML entities.
Encode to entities or decode back to characters.
Check that an ampersand and a tag now display correctly.
Copy the result for your page or template.

When to use it

Escape angle brackets so a code sample displays instead of rendering.
Decode entities from copied page source into readable text.
Safety-check user-facing text that will be inserted into HTML.
Turn a pasted snippet into visible markup for documentation.
Read text from an email or CMS that arrived entity-encoded.
Prepare a literal string for a template.

When not to use it

Do not use it as a substitute for context-aware output escaping in an application.
Do not expect it to escape quotes for an attribute value.
Do not use it to sanitize untrusted HTML; it only escapes text.

Example

An ampersand is encoded as amp-semicolon so it displays as a literal character in HTML. A less-than sign becomes lt-semicolon, which stops a tag from being parsed. A double quote is left as it is, because the textarea conversion targets text content rather than attribute values.

What you can do with HTML Encoder/Decoder

Escape ampersands, angle brackets and other HTML-sensitive characters.
Decode named and numeric entities back to text.
Handle multi-line input.
Preserve the rest of the text unchanged.
Copy the encoded or decoded result.
Run the conversion locally in the browser.

Example: test with a real sample before trusting the output

Keep the original text. These tools produce a new value rather than editing in place, so a bad transform is reversible only if you still have the source.

Test with a representative sample, including the awkward case: a quote inside a string, a tag inside an attribute, a newline in the middle of a value.

Check line endings and encoding when moving between Windows, Unix and a browser form. A trailing carriage return can break a signature or a hash.

Treat pasted HTML and Markdown as untrusted. A preview that renders raw markup can execute event handlers even when it looks harmless.

Verify the result with the real parser, compiler or linter before shipping. A browser-side formatter is a convenience, not a substitute for the toolchain.

Prefer exact values over screenshots or copied rendered text. Rendering can normalize quotes, dashes and spaces in ways that break the next tool in the chain.

What to know before you start

Encoding entities is not a substitute for proper output escaping in a web application.
Some named entities are not recognized and may pass through unchanged.
Quotes are not escaped, so the output is not ready for an attribute context.
It does not handle file input or binary data.

Common mistakes

Assuming quotes are escaped for attributes.
Encoding text that is already escaped and doubling the entities.
Using the tool as an XSS sanitizer.
Decoding untrusted markup and inserting it into a page.

Troubleshooting

If a tag still renders, the input may have been inserted as markup rather than text.

If entities appear twice, the source text already contained escaped entities.

If a named entity is not decoded, the browser may not recognize it.

If quotes are unchanged, that is expected for text-content escaping.

HTML Encoder/Decoder