Encoding
HTML Entity Encode / Decode
Escape text to HTML entities to prevent injection, or unescape entities back to text.
Focused calculator
Calculate HTML Entity Encode / Decode
<b>"Tom & Jerry"</b>
When to use this tool
Use the HTML Entity Encode / Decode for quick, focused data cleanup directly on the page before copying the output into code, documentation, spreadsheets or another tool.
- Developer, SEO, analytics and content workflows where text needs to be encoded, decoded or normalized safely.
- Cleaning a value before pasting it into a URL, HTML page, config file or API request.
- Checking privacy notes before using sensitive text such as tokens or copied session data.
Accuracy, privacy and assumptions
- Encoding changes representation, not meaning. Decoding untrusted input can reveal unsafe HTML, URLs or scripts.
- Browser-only tools keep input local; API-enabled tools can also be called programmatically for non-sensitive data.
Common mistakes to avoid
Most wrong answers from a HTML Entity Encode / Decode come from unit direction, rounding too early, or copying a result without its original context.
- Do not assume encoding encrypts data. Base64, URL encoding and HTML entities are reversible representations.
- Decode untrusted strings carefully because the output can contain scripts, markup or control characters.
- For private tokens or session strings, prefer browser-only tools and avoid unnecessary sharing.
Copy-ready result format
HTML Entity Encode / Decode output: <b>"Tom & Jerry"</b> (Escaped HTML entities).
- Keep the original input available until the destination accepts the transformed output.
- Copy validation errors along with the input when debugging a failed import.
- Use browser-only pages for sensitive copied text or account-like payloads.
Best workflow for HTML Entity Encode / Decode
- Paste or type the input into the tool above.
- Choose the target mode or format when the tool offers one.
- Review validation errors and copy the output only after it matches the expected structure.
- For sensitive data, prefer browser-only tools and avoid API-enabled endpoints.
Next steps after this result
After the immediate calculation, choose the next tool based on what you plan to do with the value.
- Copy the transformed output into the destination and test it there.
- Keep a copy of the original input.
- Use browser-only pages for sensitive values.
Formula
How it works: The characters & < > " ' are replaced with named entities such as &. Decoding expands entities back to characters.
Common examples
| Input | Result |
|---|---|
| < → encode | < |
| & → decode | & |
| encode: " | " |
JSON API example
POST a JSON body to the public endpoint.
curl -X POST https://api.convematik.com/html-entity \
-H 'Content-Type: application/json' \
-d '{"text": "<a>", "mode": "encode"}'
{
"result": "<a>"
}Common questions
What does the HTML Entity Encode / Decode do?
Escape text to HTML entities to prevent injection, or unescape entities back to text.
Does the HTML Entity Encode / Decode send my data to a server?
The HTML Entity Encode / Decode runs locally in your browser for instant results, and the same transform is also available as a public JSON API endpoint.
When should I use the HTML Entity Encode / Decode instead of a spreadsheet or script?
Use the HTML Entity Encode / Decode for quick validation, formatting, decoding or cleanup when you need a deterministic output before copying the result into code, docs, an API request or a spreadsheet.
Is the HTML Entity Encode / Decode free to use?
Yes. The HTML Entity Encode / Decode is free and does not require an account.