Base64 is useful when bytes must be represented as text, but it should never be described as a way to keep a secret.
Encoding changes representation. It does not add…
Encoding changes representation. It does not add a password, key, access control, or integrity check. A Base64 string can be decoded by the recipient with no secret.
Base64 is common in test fixtures, data…
Base64 is common in test fixtures, data URLs, MIME bodies, and transport formats. Its usefulness depends on the surrounding protocol, not on any security property of the encoding itself.
For confidentiality, use a reviewed cryptographic design…
For confidentiality, use a reviewed cryptographic design and a suitable key-management process. Do not replace encryption with an encoding step.
Use the related tool carefully
This guide is paired with a browser-only utility. The tool is a practical aid for small examples and inspection; it is not a substitute for application testing, a formal data pipeline, or professional review where the decision has higher consequences.
Open the related Base64 Encoder and Decoder