Question 1

Does this Base64 tool support Unicode and emojis?

Accepted Answer

Yes. Text is encoded and decoded using TextEncoder/TextDecoder, so multi-byte characters, special symbols, and emojis convert correctly without errors.

Question 2

What happens if I paste invalid Base64 in decode mode?

Accepted Answer

The tool detects invalid Base64 input and shows a clean "Invalid Base64 format" message in the output area instead of breaking the page.

Question 3

Is anything uploaded to a server?

Accepted Answer

No. All encoding and decoding happens entirely in your browser. Nothing you type or paste is sent to or stored on a server.

Base64 Encoder & Decoder