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Opened a file and seeing weird characters like é or £?

That's an encoding mismatch. Identify the encoding and convert it properly.

Encoding Converter

Base64, URL, HTML entities, Unicode, Hex

Understanding Text Encoding

Text encoding is the process of converting characters into a format that can be stored, transmitted, and interpreted by computers. Every character you see on screen — letters, numbers, symbols, emojis — is represented as a sequence of bytes using an encoding scheme. The most widely used standard today is UTF-8, which can represent every character in the Unicode standard while remaining backward-compatible with ASCII.

Common Encoding Schemes

Base64 encodes binary data as ASCII text for safe transmission through text-based protocols like email and JSON. URL encoding converts special characters to percent-encoded format (%20 for spaces) so they can be used in web addresses. HTML entities replace reserved characters like < and & with safe representations to prevent injection in web pages. Unicode escape sequences represent characters by their code points, essential for handling international text in JavaScript and other programming languages.

Common Mistakes

  • ✗Confusing encoding with encryption — encoding is reversible and provides no security, while encryption requires a key
  • ✗Forgetting that URL encoding only handles special characters — use URL Encode (All) for full percent-encoding
  • ✗Assuming all systems use the same encoding — mismatched character sets cause garbled text (mojibake)

Pro Tips

  • ✓Use Base64 when you need to embed binary data (images, files) in JSON or XML payloads
  • ✓URL-encode user input before appending it to query strings to prevent injection attacks
  • ✓Use UTF-8 everywhere — it supports all languages and is the default encoding for the web

Real-World Examples

API authentication

Base64-encode credentials for HTTP Basic Auth headers

Form submissions

URL-encode form data before sending via GET requests

Displaying code

HTML-encode angle brackets to safely show code snippets on web pages

Base64: Encode binary data as ASCII string, commonly used for data transmission.

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Text Encoding Explained

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About Encoding Converter

What is Encoding?

Encoding is the process of converting data from one format to another. In computing, encoding is used to represent characters, binary data, or other information in different formats that are suitable for transmission, storage, or processing. Every time you send a message, visit a website, or save a file, encoding plays a role in making sure the data is correctly interpreted.

Understanding different encoding types is essential for anyone working with text, data, or web technologies. Whether you need to embed special characters in a URL, send binary data through a text-based protocol, or convert between character sets, encoding tools make these tasks simple and reliable.

Types of Encoding

Base64 converts binary data into an ASCII string representation. It is commonly used for encoding images, files, or binary data in emails, JSON payloads, and data URIs. Base64 increases data size by approximately 33% but ensures compatibility with text-based systems.

URL Encoding converts special characters into a format that can be safely transmitted over the internet. For example, spaces become %20 and ampersands become %26. This is essential when passing parameters in URLs, form submissions, and API requests.

HTML Entity Encoding converts special characters into their HTML entity equivalents. For example, < becomes &lt; and & becomes &amp;. This prevents browsers from interpreting special characters as HTML tags and is crucial for displaying code snippets and user-generated content safely.

Unicode Encoding represents characters using their Unicode code points, such as \\u0041 for the letter A. This is widely used in programming, JavaScript strings, and internationalized applications to handle characters from all languages and scripts.

Hexadecimal and Binary represent text as hex or binary values. These formats are used in low-level programming, network protocols, cryptography, and debugging. Each character is converted to its numeric representation in the respective base.

How to Use This Tool

Our encoding converter supports 11 different encoding types. To use it, simply select the encoding type you want from the buttons above, paste or type your input text, and click either Encode or Decode. You can swap the input and output using the Swap button, copy the result to your clipboard, or clear everything to start over.

The tool processes everything locally in your browser, so your data never leaves your device. This makes it safe for encoding sensitive information like passwords, API keys, or personal data.

This utility is provided for informational purposes only. KnowKit is not responsible for any errors in the output.

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Frequently Asked Questions

What is the difference between URL encode and URL encode (All)?

Standard URL encoding only encodes characters that have special meaning in URLs (like spaces, &, ?, =, etc.). URL encode (All) encodes every character, which is useful when you need to represent the entire input as percent-encoded characters.

Is Base64 encoding the same as encryption?

No. Base64 is encoding, not encryption. It is easily reversible and does not provide any security. Base64 simply represents binary data as text. For security, use proper encryption algorithms like AES.

Why does my encoded text look longer than the original?

This is normal for most encoding schemes. Base64 increases size by ~33%, URL encoding adds % prefix to special characters, and HTML entities add & prefix and ; suffix. This overhead is the tradeoff for compatibility and safety.

Can I encode non-English text?

Yes. Our tool supports Unicode text, including Chinese, Japanese, Korean, Arabic, and other languages. The Unicode and Unicode Escape encoding types are specifically designed for handling multi-byte characters.

Is my data safe?

Absolutely. All encoding and decoding happens locally in your browser. No data is sent to any server, and nothing is stored or logged.