About Base64

Formula: Encoded size ≈ original size × 4/3

Base64 encodes binary data into ASCII text using 64 characters (A–Z, a–z, 0–9, +, /). Every 3 bytes of input produce 4 characters of output, making the encoded result about 33% larger. It's commonly used for embedding images in HTML/CSS, email attachments (MIME), and data URLs.