HTML Entities Encoder / Decoder

What is this tool

Anyone who has worked on email templates or website content has likely encountered strange text behavior. You insert a simple ampersand (&) into your HTML, but instead of displaying it, the browser treats it as the start of a technical construct. Or perhaps you are writing an article in English but need French accented letters that do not always render correctly on older servers.

The HTML Entities tool is designed for exactly these situations. It takes your plain text string and converts all risky or non-standard characters into special HTML codes (entities) that the browser is guaranteed to display correctly. This is useful for developers editing templates by hand, content managers working with SEO publishing systems, and beginners learning web technologies who want to understand how encoding works. Instead of memorizing hundreds of symbols or searching through massive tables, you simply paste your text and get the result.

Best of all, the entire process happens locally in your browser. You can convert content that is not intended for public release without worrying about it being sent to a third party server.

Features

• Text encoding and decoding: convert in whichever direction you need.
• Support for three encoding formats: named entities (e.g., ©), decimal codes (e.g., ©), and hex codes (e.g., ©).
• "Encode all non-ASCII" option: converts all characters outside the basic Latin alphabet, such as Cyrillic or special symbols.
• Convenient "Copy" button for instant clipboard saving and a "Clear" button to reset both fields.
• Built-in HTML entities reference table: search for a symbol or its code without leaving the page.
• One-click copying of entities directly from the reference table.
• Complete privacy: all operations are performed on your device, with no data sent to the server.

How to use

Before starting, it is important to understand the basic logic. The tool has two modes that work in opposite directions. If you plan to insert text into a page's HTML code, use the "Encode" mode. If you are dealing with existing HTML code where characters are replaced by entities and you want to restore their original appearance, use the "Decode" mode.

The step-by-step process is as follows:

1. Choose the mode. Above the left input field, you will see a toggle or two buttons. Select "Encode" or "Decode" depending on your task.
2. Paste the text. Enter your source string into the left field. This can be a single character or a large paragraph of text.
3. Adjust settings (if needed). If you need to convert all non-ASCII characters (Cyrillic, diacritics, etc.) into codes, check the "Encode all non-ASCII" option. If left unchecked, the tool will only convert characters that are reserved in HTML: &, <, >, ", '. Also, select your preferred output format: named, decimal, or hex.
4. Run the conversion. Click the "Encode" or "Decode" button located below the input field.
5. Copy the result. Once processed, the result will appear in the right panel. Click the "Copy" button to save the code to your clipboard and paste it into your project.

If you need to quickly find the code for a specific symbol, such as the trademark sign ™, use the reference table below. It includes a search field for the symbol name or the entity itself. Just click the desired row, and the code will be copied automatically.

Remember: all actions are performed locally. This means the tool works even with a slow internet connection, and your data never leaves your device.

Typical Scenarios

Here are a few examples of where this tool is most useful.

Scenario 1: Preparing content for a CMS. Most modern admin panels allow you to insert HTML code directly into an article. If you are writing a review mentioning the C++ programming language or a mathematical formula using the "≥" sign, encoding is necessary. Simply paste the sentence, click "Encode", and you get a version safe for HTML markup. This is especially important for emails using fonts with specific glyphs.

Scenario 2: Working with emails. Some email clients, like Microsoft Outlook, are very picky about HTML code. If your signature or email body contains special characters, they may display incorrectly. Pre-converting text to entities ensures the recipient sees the email exactly as you intended, particularly for characters outside the standard ASCII table.

Scenario 3: Learning web technologies. For students or beginners trying to understand how HTML works, this tool serves as a visual guide. You can decode an existing page or a snippet of code to see which characters are hidden behind constructs like у. This helps you learn encoding structures and read others' code without needing browser extensions.

Scenario 4: Preventing script conflicts. If you are developing a web page with dynamic JavaScript elements and need to insert a string that contains characters that could be interpreted as code, pre-encoding helps avoid execution errors.

Tips and Common Mistakes

While the tool is simple, there are a few nuances to keep in mind to avoid unexpected results.

Tip 1: Be mindful of the "non-ASCII" option. If disabled, the tool leaves non-Latin letters unchanged, converting only reserved symbols like ampersands or angle brackets. This is useful if your CMS already supports UTF-8. However, if your database or server uses an outdated encoding, it is better to enable this option to avoid rendering issues.

Tip 2: Do not confuse formats. Named entities like é are easy to remember but may not be supported by all old browsers. The decimal format é is more universal. The hex format é is typically used in CSS and JavaScript contexts. Choose the one that matches your development environment.

Common Mistake: Double encoding. Never paste already encoded text into the field and run the encoding process again. You will end up with a mess of codes that the browser cannot process. If the result looks strange, use "Decode" to restore the original text.

Tip 3: Check the semicolon. Every HTML entity must end with a semicolon. If you are copying code from an old textbook or another source, ensure it is present, otherwise the browser may misread the symbol.

Tip 4: Use the reference table search. If you are looking for a code but only know what the symbol looks like, try searching by its English name. For example, searching for "copyright", "trademark", or "infinity" will give you the result immediately, which is much faster than scrolling manually.