Base64 Encoder & Decoder

Base64 Encoding & Decoding Made Simple

Base64 is a binary-to-text encoding scheme that represents binary data in an ASCII string format. It is commonly used to encode data that needs to be stored or transferred over media designed to handle text, ensuring data remains intact without modification during transport.

What is Base64?

Base64 encoding converts binary data into a set of 64 characters (A-Z, a-z, 0-9, +, and /). This makes it safe to transmit data over channels that might corrupt binary data, such as email, URLs, or JSON files.

Common Uses of Base64:

• Email Attachments: Encoding binary files in email messages (MIME encoding)
• Data URIs: Embedding images directly in HTML or CSS files
• API Authentication: Encoding credentials for HTTP Basic Authentication
• JSON/XML Data: Storing binary data in text-based formats
• URL Parameters: Safely passing binary data in URLs
• Certificates & Keys: Storing cryptographic keys and certificates

How to Use This Tool:

• Encode Text: Enter plain text in the input field to convert it to Base64 format
• Decode Base64: Switch to "Decode" mode and paste a Base64 string to convert it back to plain text
• Real-Time Conversion: The tool converts automatically as you type (with a small delay for performance)
• Format Options: Enable line breaks to format Base64 output in 76-character lines (MIME standard)
• Copy & Download: Easily copy results to clipboard or download as a text file
• Try Sample: Click "Try Sample" to see the tool in action with example text

Base64 Encoding Example:

Understanding Base64 Characters:

Base64 uses 64 printable characters to represent data:

• A-Z: Uppercase letters (values 0-25)
• a-z: Lowercase letters (values 26-51)
• 0-9: Digits (values 52-61)
• + and /: Two additional characters (values 62-63)
• =: Padding character used to make output length a multiple of 4

Important Notes:

• Base64 encoding increases data size by approximately 33% (4 bytes for every 3 bytes of original data)
• Base64 is not encryption - it is an encoding scheme that can be easily reversed
• Do not use Base64 to hide sensitive information - use proper encryption instead
• The "=" character at the end is padding and may appear 0, 1, or 2 times
• All processing happens in your browser - your data is never sent to any server

When to Use Base64:

• ✅ Embedding small images in CSS or HTML
• ✅ Transmitting binary data over text-only protocols
• ✅ Storing binary data in JSON or XML
• ✅ HTTP Basic Authentication headers
• ❌ Do not use for large files (creates overhead and slower processing)
• ❌ Do not use as a security measure (it is easily reversible)