Base64 Encoder/Decoder
Easily encode text to Base64 and decode Base64 back to text with this simple, efficient tool.
Input
Output
About Base64 Encoding
Base64 is a binary-to-text encoding scheme that represents binary data in an ASCII string format. It's commonly used when there is a need to encode binary data that needs to be stored and transferred over media designed to deal with text.
Why Use Our Base64 Tool?
Instant Conversion
Encode or decode text in milliseconds with our optimized processing.
Client-Side Processing
Your data never leaves your browser, ensuring complete privacy and security.
UTF-8 Support
Full support for UTF-8 characters, including emojis and non-Latin scripts.
Error Handling
Clear error messages when attempting to decode invalid Base64 strings.
Size Statistics
See how encoding affects your data size with detailed statistics.
Mobile Friendly
Works perfectly on all devices - desktop, tablet, and mobile.
How Base64 Encoding Works
What is Base64?
Base64 is a group of binary-to-text encoding schemes that represent binary data in an ASCII string format by translating it into a radix-64 representation.
Example: "Hello" becomes "SGVsbG8="
Common Uses
Base64 is commonly used for encoding data in emails, storing complex data in XML or JSON, and embedding binary data in web pages.
Examples: Data URLs, email attachments, basic authentication
Encoding Process
Each group of 3 bytes (24 bits) is split into 4 groups of 6 bits, each representing a value from 0 to 63, mapped to a character set.
Character set: A-Z, a-z, 0-9, +, /, = (padding)
Size Considerations
Base64 encoding increases the size of the data by approximately 33% due to the representation of 3 bytes using 4 characters.
Example: 3 bytes → 4 characters (33% increase)
Frequently Asked Questions
Is this tool secure?
Yes! All processing happens entirely in your browser. Your data is never sent to any server, ensuring complete privacy and security.
Does this support UTF-8 characters?
Yes, our tool properly handles UTF-8 characters by using encodeURIComponent and decodeURIComponent functions to ensure all characters are correctly encoded and decoded.
What happens if I try to decode invalid Base64?
The tool will display a clear error message indicating that the input is not a valid Base64 string. This helps you identify and correct issues with your input.
Why does Base64 encoding increase size?
Base64 represents every 3 bytes of binary data as 4 ASCII characters, resulting in a 33% size increase. This is the trade-off for representing binary data as text.
What are the padding characters (=) for?
Padding characters are used to ensure the final encoded string length is a multiple of 4. They indicate how many padding bytes were added during encoding.