Base64 Encoder/Decoder
Encode and decode Base64 strings online
Base64 FAQ
What is Base64 encoding?
Base64 is a way of representing binary data using 64 printable ASCII characters. It is commonly used to embed data in JSON, XML, URLs, emails and data URIs.
Is Base64 a form of encryption?
No. Base64 is an encoding, not encryption. Anyone can decode it, so never use it to protect passwords or sensitive data.
Does this tool support Unicode and emoji?
Yes. Text is converted to UTF-8 before encoding, so accented characters, non-Latin scripts and emoji are encoded and decoded correctly.
Why does Base64 output end with = signs?
The = characters are padding. Base64 works on 3-byte groups, and padding is added when the input length is not a multiple of three.
Is my data sent to a server?
No. Encoding and decoding run entirely in your browser, so your text never leaves your device.
What Is Base64 Encoding?
Base64 is a binary-to-text encoding scheme that converts binary data into a set of 64 printable ASCII characters. It is widely used in web development, email attachments (MIME), data URIs, and API authentication tokens. When you encode data in Base64, every three bytes of input are represented as four characters of output, making it roughly 33 percent larger than the original but completely safe for text-based transport channels that do not handle raw binary.
Our free online Base64 encoder and decoder supports full Unicode (UTF-8) text, so you can safely encode strings containing special characters, emojis, or non-Latin scripts. Simply paste your text, click Encode or Decode, and copy the result. No data is sent to any server — everything runs entirely in your browser for maximum privacy and speed.