SimpleTools

Developer Tool

Encode and decode Base64 instantly.

This tool is useful when you need to convert text for APIs, quick checks, or debugging. Keep the workflow simple and it will fit naturally into the developer tools section.

Useful for developers, debugging, and quick string handling

Works fully in the browser without server uploads

Good for repeat use and search traffic

Pairs naturally with JSON and URL utilities

Result will appear here.
Encode text to Base64 or decode Base64 back to text.

How to use

Encode or decode Base64 in three steps.

Step 1

Paste text or Base64 content into the input area.

Step 2

Choose Encode or Decode mode.

Step 3

Click Run and copy the result.

FAQ

Does this upload text to a server?

No. Encoding and decoding happen inside the browser, so your text stays on your device.

Can this handle Unicode text?

Yes. This tool supports common Unicode text input and output for browser workflows.

Why does decoding fail sometimes?

The input may not be valid Base64 or might include unexpected characters and line breaks.

Base64 Encode Decode Tool | SimpleTools Online