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What is Base64 Encoding?
Base64 is a binary-to-text encoding scheme that converts binary data (such as images, files, or strings) into an ASCII format consisting of 64 printable characters (A-Z, a-z, 0-9, +, and /).
When Should You Use Base64?
Inline Data URLs
Embed small images or custom SVG icons directly inside HTML/CSS files without initiating additional HTTP network requests.
Email Attachments (MIME)
MIME protocols rely on Base64 to safely transmit binary email attachments across legacy text-based mail servers.
Base64 FAQs
No. Base64 is strictly an encoding method, not encryption. It does not use secret keys and can be easily decoded by anyone using any standard decoder. Never use Base64 alone to secure sensitive user passwords or private financial data.
Base64 translates 3 bytes of binary data (24 bits) into 4 printable ASCII characters (4 × 6 bits = 24 bits). Because 4 characters are used to convey 3 bytes of raw data, the encoded output size increases by approximately 33%.