Base64 Encoder & Decoder

About Base64 Encoder & Decoder

Base64 is a standard binary-to-text encoding scheme used in computing to represent binary data in an ASCII string format. Our free Base64 converter makes it easy to encode text to Base64 and decode Base64 strings back to plain text. This tool works entirely in your browser—no data is sent to any server.

What is Base64?

Base64 encoding converts binary data into a string of ASCII characters. The term "Base64" comes from the mathematical base-64 numeral system. It uses 64 printable characters (A-Z, a-z, 0-9, +, /) to represent binary data. This encoding is commonly used in email, URLs, data URIs, and APIs where binary data needs to be transmitted as text.

Key Features

• Encode to Base64: Convert plain text to Base64 encoding
• Decode from Base64: Convert Base64 strings back to plain text
• Auto-Detect Mode: Automatically detects whether input is Base64 or plain text
• UTF-8 Support: Full support for Unicode and international characters
• Copy Output: One-click copying of encoded or decoded results
• Pretty Print: Format output for better readability
• Real-Time Processing: Instant encoding and decoding
• Error Handling: Clear error messages for invalid Base64

Common Use Cases

• Encoding credentials for HTTP authentication
• Embedding images in HTML/CSS as data URIs
• Encoding binary data for email transmission
• Encoding data in API requests and responses
• Storing and transmitting sensitive data
• Converting images to base64 for web embedding
• Working with JSON Web Tokens (JWT)
• Troubleshooting encoded data in logs

How to Use This Base64 Converter

• To Encode: Paste plain text in the input field and click "Encode to Base64"
• To Decode: Paste Base64 in the input field and click "Decode from Base64"
• Auto Mode: Enable "Auto-detect encoding" to automatically detect whether input should be encoded or decoded
• Copy Results: Click "Copy Output" to copy the result to your clipboard

Examples

Encoding: Plain text "Hello World!" encodes to SGVsbG8gV29ybGQh

Decoding: Base64 SGVsbG8gV29ybGQh decodes to plain text "Hello World!"

Base64 Encode Online for Data Transmission

Use our base64 encode online tool to convert text and binary data into ASCII-compatible format. Base64 encoding is essential for transmitting non-text data through text-only channels like email, HTTP headers, and APIs. This encoding method converts binary data into 64 safe printable characters, making it perfect for embedding images in HTML/CSS or storing binary data in JSON documents.

Base64 Decode for Data Recovery

Easily base64 decode strings back to their original format using our converter. Whether you're working with encoded email attachments, API responses, or data URIs, our tool instantly decodes base64 strings to readable text or binary data. The auto-detect feature recognizes whether input is base64 or plain text, automatically applying the correct conversion.

Base64 Converter Tool for Developers

As a comprehensive base64 converter tool, this utility handles encoding and decoding with full UTF-8 support for international characters. Perfect for developers working with APIs, JWTs, and web technologies where base64 encoding is standard. The pretty print option formats output for better readability, making it easy to inspect encoded data structures.