Is Base64 encryption?

No. It is an encoding that anyone can reverse. Never use it to protect secrets.

Why did decoding fail?

Either the input is not valid Base64, or it decodes to binary data (such as an image) rather than text.

Is my data sent to a server?

No. Everything is processed in your browser, which matters when the input is a production payload, token or query. Nothing is uploaded, logged or stored.

Base64 Encoder and Decoder - Free Online Tool

JavaScript is turned off. InspireTools processes files in your browser, so the tools need JavaScript to run.

Encode text to Base64 or decode it back, with URL-safe and UTF-8 support.