Published 2026-04-05

What Is Base64 Encoding? Practical Examples for Developers

Learn what Base64 encoding is, when to use it, when not to use it, and how it differs from encryption.

Base64 encoding is a way to represent binary data using a limited set of ASCII characters. It is commonly used when binary data must travel through systems that are designed to handle text.

Common use cases include email MIME payloads, data URLs in browsers, and API integrations where binary data is transmitted as JSON or plain text.

Base64 is not encryption. Anyone can decode it. It improves compatibility, not secrecy.

Use it when transport constraints require text-safe content. Avoid using it as a security mechanism or when payload size is critical, because Base64 increases the size of data by roughly one third.