Base64 Encoder & Decoder

The Base64 Encoder & Decoder allows you to quickly convert text or binary data into Base64 format and decode it back again. It’s a simple and reliable tool for developers working with APIs, authentication headers, and data transport formats.

All processing happens locally in your browser, ensuring your data stays private.

How Base64 encoding works

Base64 converts binary data into an ASCII string using a limited set of characters. This makes it safe to transmit data through systems that are designed to handle text only.

The encoding process groups binary data into 6-bit segments and maps them to a set of 64 characters consisting of:

• Uppercase letters (A–Z)
• Lowercase letters (a–z)
• Numbers (0–9)
• Two additional symbols (+ and /)

The = character may appear as padding at the end of the encoded string.

Example uses

• HTTP Basic Authentication headers
• Embedding images in HTML or CSS using data URIs
• Transmitting binary data through JSON or XML
• Email attachments using MIME encoding
• API tokens or keys that require Base64 formatting

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