Base64 Encode / Decode

Encode Unicode text as Base64 or decode strict Base64 to UTF-8 text.

How It Works

Uses RFC 4648 Base64 with UTF-8 text encoding. Base64 is an encoding, not encryption. Invalid Base64 and invalid UTF-8 are rejected.

How does this calculator work?

Uses RFC 4648 Base64 with UTF-8 text encoding. Base64 is an encoding, not encryption. Invalid Base64 and invalid UTF-8 are rejected.

What assumptions should I check?

Check the units and definitions shown beside each input. Results use the values you enter.