Base64 Encode/Decode

What is it?

The Base64 Encoder and Decoder is a free developer tool that translates plain text or binary data into a Base64 encoded ASCII string, and vice versa.

When should you use it?

Base64 is used to encode binary data so it can be safely transmitted over text-based protocols like HTTP and SMTP. You should use this tool to decode JWT (JSON Web Token) payloads, encode basic authentication headers, or embed small images directly into CSS/HTML.

How does it work?

The tool uses the browser’s native btoa() (binary to ASCII) and atob() (ASCII to binary) functions. This means the encoding algorithm runs entirely at the hardware level on your local machine, without any server interaction.

Example Input (Encode)

Hello World!

Example Output (Encode)

SGVsbG8gV29ybGQh

How to Use This Tool

1. Paste your string into the input panel.
2. Select whether you want to Encode or Decode from the options bar.
3. The tool instantly transforms your text in the output panel.

Why use this offline converter?

Base64 often contains sensitive tokens, credentials, or private data. Because this converter is 100% browser-based, your data never leaves your machine. It offers the speed and convenience of an online tool with the security of a local script.