Base64 Encoder / Decoder

When do you need Base64?

• Embedding images in CSS / HTML. Small icons can be inlined as data:image/png;base64,… URIs to avoid an extra HTTP request.
• HTTP basic auth headers. Authorization: Basic [base64 of "user:password"].
• API tokens and JWTs. JWT payloads are URL-safe Base64.
• Storing binary in JSON / DBs. When the field needs to be plain-text.
• Email attachments. MIME-encoded files in SMTP.

Base64 is encoding, not encryption — anyone can decode it. Don't use Base64 to hide secrets.