Quick start
- Choose Encode when your text contains characters such as <, >, &, quotes, or apostrophes.
- Choose Decode when your text contains entities such as <, &, or numeric entity codes.
- Paste the snippet and run the tool.
Best uses
These are the situations this tool is meant for. If your task is close to one of these, the examples and notes below can help you choose the right inputs.
- Show HTML code examples inside a blog post, guide, or documentation page.
- Decode copied entity text so it is easier to read.
- Escape short snippets before placing them in visible HTML text.
- Check whether a string changed after encoding or decoding.
What this calculator is solving
The HTML Entity Encoder / Decoder helps with small snippets that need to be shown as text. If you want readers to see a tag instead of the browser treating it like markup, encode the sensitive characters. If you copied entity text and need to read it, decode it.
You do not need to memorize the formula first. Start by matching each input label on the calculator to the number, date, unit, or setting you actually have.
The formula in plain language
In plain language: Encode mode replaces &, <, >, quotes, and apostrophes with HTML entities. Decode mode converts supported named and numeric entities back to characters. The examples on the page are there so you can compare your inputs with a filled-out calculation before copying the answer.
If that sounds abstract, use the example cards on the calculator page. They show a complete set of inputs and the kind of answer you should expect.
How to read the answer
Read the headline result first. Then look at the smaller supporting lines because they explain the parts behind the answer, such as totals, units, ranges, or formula steps.
- The output is the copy-ready encoded or decoded text.
- Entity count shows how many entity replacements were found.
- Changed positions gives a quick signal for how much the output differs from the input.
Common mistakes to avoid
If the answer looks strange, the most likely cause is a small input mismatch: the wrong unit, date, weight, scale, mode, or policy assumption.
- Do not treat entity encoding as a full security sanitizer.
- Do not decode unknown HTML and paste it into a live page without reviewing it.
- Remember that this tool supports common entities and numeric entity codes, not every named entity ever defined.
Research and references
These references shaped the calculator assumptions, unit choices, or safety notes.
Examples from the calculator
<strong>Free & fast</strong>
<strong>Tools</strong>
Encoded quote and ampersand text
FAQ in plain language
When should I use the HTML Entity Encoder / Decoder?
Use it when your task matches one of these common needs: Show HTML code examples inside a blog post, guide, or documentation page. Decode copied entity text so it is easier to read. It works best when you already know the values, dates, units, or settings the page asks for.
What is the HTML Entity Encoder / Decoder doing with my inputs?
In plain language: Encode mode replaces &, <, >, quotes, and apostrophes with HTML entities. Decode mode converts supported named and numeric entities back to characters. The examples on the page are there so you can compare your inputs with a filled-out calculation before copying the answer.
What do the main HTML Entity Encoder / Decoder inputs mean?
The main inputs are the values, text, dates, units, or settings the tool needs before it can work. Read each field label carefully, keep units consistent, and compare your entry with the examples if the answer looks strange.
How should I read the HTML Entity Encoder / Decoder answer?
Read the output next to your original input. If the tool changes format, units, encoding, spacing, or capitalization, compare a small sample before copying the whole result into another app.
What should I double-check before trusting the answer?
Entity encoding is useful for displaying code examples as text, but it is not a complete sanitizer for untrusted HTML or script content. Also check that you used the right unit, date, scale, or mode because small input changes can change the result.
Does the site save what I enter?
No. The calculator runs in your browser tab. Your recent answers stay only on the page while you use it, and they are not sent to a server.
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Privacy and copying results
Recent answers stay visible only while you work in the current browser tab. They are not sent to a server.
Use Copy answer when you want to paste the expression and result into notes, homework, a message, or another document. Check the units and assumptions before copying.