Base64 Encoding — Use Case Examples

Base64 Use Case Examples

Base64 is widely used in web development, APIs, and data transmission.

Embedding Images in HTML/CSS

Data URIs allow you to insert small images directly into code without separate files. This reduces the number of HTTP requests.

Email and MIME

Email attachments are encoded in Base64 so they can be transmitted through the text-based SMTP protocol.

JWT Tokens

JSON Web Tokens use Base64URL to encode the header and payload. Each JWT consists of three parts separated by dots.

APIs and Data Transfer

Storing Keys and Certificates

Cryptographic keys and certificates are often stored in PEM format, which uses Base64 encoding.

Debugging and Testing

Developers use Base64 to quickly inspect the contents of encoded data in logs and debug messages.

See also: URL Encoding, HTML Encoding, Binary Text