Base64 Encoder / Decoder

Encode string data to Base64 format or decode Base64 back to a string.

What is Base64 Encoding?

Base64 is a group of binary-to-text encoding schemes that represent binary data in an ASCII string format. The term "Base64" originates from a specific MIME content transfer encoding. Each Base64 digit represents exactly 6 bits of data.

It is commonly used when there is a need to encode binary data (like images or documents) that needs to be stored and transferred over media that are designed to deal with textual data. This ensures that the data remains intact without modification during transport.

When should you use Base64?

  • Data URIs: Embedding small images or fonts directly into HTML/CSS files to reduce HTTP requests.
  • Email Transmissions: Encoding attachments in email protocols (MIME) which only reliably support 7-bit ASCII characters.
  • API Payloads: Sending complex binary data or documents over REST APIs in JSON payloads.
  • Storing Secrets: Sometimes used to safely store tokens or keys in environments that don't handle special characters well (Note: Base64 is NOT encryption, do not use it to hide sensitive data).

How to use this tool

  1. Select your desired operation: Encode Text or Decode Base64 using the toggle buttons.
  2. Type or paste your text into the corresponding input box.
  3. The tool will instantly convert your input as you type.
  4. Click the copy icon to easily copy the result to your clipboard.

Security Note: All encoding and decoding operations happen entirely within your browser using JavaScript's native btoa() and atob() functions. Your text is never transmitted over the internet or saved on any server.