Online Base64 Encoder
Online Base64 encoder: encode any text or binary data into a Base64 string in your browser instantly. Supports Chinese and Unicode characters.
Tool input and output
Base64 encoding use cases
Base64 is an encoding scheme that converts binary data into an ASCII string. It is widely used to pass data through text-only channels such as URLs, HTTP requests, JSON configs and email attachments, and to serialize files like images into plain text.
This tool encodes instantly in your browser: type any text to get its Base64 string. Unicode characters such as Chinese, Japanese and emoji are converted to UTF-8 bytes first, matching standard implementations exactly.
Which standard defines Base64?
Base64 turns binary data into text. It is an encoding, not encryption. The alphabet and padding rules are in RFC 4648.
“The encoding process represents 24-bit groups of input bits as output strings of 4 encoded characters.”
Frequently Asked Questions
Why does a Base64 string end with = ?
Base64 encodes every 3 bytes into 4 characters. When the input length is not a multiple of 3, padding characters (=) are appended to reach a multiple of 4. This is normal and ignored when decoding.
Does Base64 encoding support Chinese?
Yes. Unicode characters are converted to UTF-8 bytes first and then encoded, matching the output of standard libraries in mainstream programming languages.
Is Base64 encryption?
No. Base64 is a reversible encoding with no secrecy — anyone can decode it. It is for data transport and storage, not for protecting sensitive information.