Skip to content
NexUnit home
EnglishEspañol

Base64 Encoder & Decoder

Encode text to Base64 or decode Base64 back to text, with full UTF-8 support.

Mode

How it works

Text is encoded to UTF-8 bytes, then each 3 bytes become 4 Base64 characters.

Questions

How does the base64 encoder & decoder work?
Text is encoded to UTF-8 bytes, then each 3 bytes become 4 Base64 characters.
Is my text sent to a server?
No. The tool runs entirely in your browser; nothing you type is uploaded.

Want this on your site? Embed the base64 encoder & decoder.