Base64 is an encoding scheme that converts binary data into ASCII characters. It encodes every 3 bytes of data into 4 ASCII characters, commonly used to transmit binary data in text-based environments (email attachments, embedded images, API parameters, etc.).
Standard Base64 uses + and /, which have special meanings in URLs. URL-safe mode replaces + with -, / with _, and removes = padding.
β’ JWT Token: JSON Web Token Header and Payload use Base64URL encoding
β’ Data URI: Embed images as data:image/png;base64,...
β’ Email Attachments: MIME protocol uses Base64 to encode binary attachments
β’ API Parameters: Pass binary data in HTTP parameters
No. Base64 is an encoding scheme, not encryption. Anyone can decode it and it provides no security. For secure transmission, use it with TLS/SSL or a real encryption algorithm.
Yes. Base64 encoding increases data size by approximately 33% (3 bytes become 4 characters). For example, 300 bytes of data becomes about 400 characters.
Yes. The tool uses the TextEncoder API to convert text to UTF-8 bytes before encoding, with full support for Chinese, Emoji, and other multi-byte characters.