Base64 Encoder/Decoder
An online tool to convert between text and Base64 strings.
How to Use the Base64 Tool
This Base64 conversion tool lets you convert between text and Base64 strings. Select the "Encode" tab and enter text to get a Base64-encoded string. Select the "Decode" tab and enter a Base64 string to decode it back to the original text. It supports multibyte characters using UTF-8 encoding for accurate conversion. Click the "Convert" button or enter text to see the result. Use the copy button to copy the output to your clipboard.
What is Base64 Encoding?
Base64 is an encoding scheme that converts binary data into ASCII strings. It uses 64 types of characters (A-Z, a-z, 0-9, +, /) and the padding character = to represent data. It is mainly used in email (MIME), data URI schemes, API authentication tokens (Basic auth), JSON Web Tokens (JWT), and more. Base64 encoding increases data size by about 33%, so it is not suitable for transferring large data. Base64 is not encryption but merely encoding, and should not be used for protecting sensitive data. In web development, it is commonly used as Data URIs to embed small images directly in HTML or CSS.
Frequently Asked Questions (FAQ)
Q. Can multibyte characters be converted correctly?
A. Yes, it uses UTF-8 encoding to accurately encode and decode multibyte characters. It uses TextEncoder and TextDecoder for reliable conversion.
Q. What causes Base64 decode errors?
A. Errors occur when the input string is not valid Base64 format. Base64 uses a limited character set, so invalid characters cause decode failures. Whitespace and line breaks in the input are automatically removed before processing.
Q. Is my input data secure?
A. All conversion processing is completed within your browser. Input data is never sent to any server.