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Base64 is a binary-to-text encoding scheme that converts binary data into a set of 64 ASCII characters (A-Z, a-z, 0-9, +, /). It is commonly used to embed binary data like images in HTML/CSS, transmit data in JSON or XML, and encode email attachments. The encoding increases data size by approximately 33%.
No, Base64 is purely an encoding method, not encryption. It provides no security whatsoever as anyone can decode it instantly without a key. Never use Base64 to protect sensitive data — use proper encryption algorithms like AES instead. Base64 is designed for data transport, not confidentiality.
URL-safe Base64 replaces the standard + and / characters with - and _ respectively, making the encoded string safe to use in URLs and filenames without additional percent-encoding. It also optionally omits the padding = characters. This variant is commonly used in JWT tokens and URL query parameters.
