zippydevtoolsBase64 is encoding, not encryption
Base64 makes binary or text data safe to carry in transport fields, config values, and payloads that expect printable characters.
Anyone with the value can decode it, so Base64 alone does not protect secrets.
Choose Base64 or Base64URL
Standard Base64 uses + and /. Base64URL uses - and _ so values can travel in URLs and token segments without those reserved characters.
Select the alphabet that matches the source. Do not mix both alphabets in one value, and use JWT Decode for a complete three-segment token.
Normalize whitespace and padding safely
Copied Base64 may contain ASCII spaces or line breaks, which can be removed before decoding. Missing trailing = padding can be restored only when the remaining length defines a valid representation.
An impossible length, malformed padding, or noncanonical trailing bits should be corrected at the source instead of accepted silently.
Follow the decoded text
After decoding, send JSON text to JSON Validator, a complete JWT to JWT Decode, or URL-encoded text to URL Decode.
If the bytes do not form UTF-8, the value likely represents binary content. A text decoder should stop instead of displaying replacement characters as if they were reliable output.
Security caveats
Do not paste production secrets into tools unless your own data policy allows it.
If a system says a value is encrypted, Base64 decoding may only reveal an encrypted blob, not the original plaintext.