Is Base64 encryption?

No. Base64 is reversible encoding and provides no confidentiality, integrity or authentication.

Why does Auto sometimes choose Encode?

Auto only decodes structurally valid Base64 that becomes valid UTF-8 text, avoiding false positives for short plain text.

EffiRoom

Base64 Text Encoder Decoder

Convert Unicode text and Base64 locally

Runs locally in your browser; input is never uploaded

Encoding & Security

ModeAuto detect: decodes if the input is valid Base64, otherwise encodes. You can also manually choose encode or decode.

Usage

Paste plain text or Base64 and choose Auto detect, Encode to Base64 or Decode to text under Mode. UTF-8 and URL-safe Base64 are supported. Invalid characters, padding or non-UTF-8 results only produce diagnostics.

FAQ

1.
Is Base64 encryption?
No. Base64 is reversible encoding and provides no confidentiality, integrity or authentication.
2.
Why does Auto sometimes choose Encode?
Auto only decodes structurally valid Base64 that becomes valid UTF-8 text, avoiding false positives for short plain text.