About this Universal Encoder & Decoder
Base64 • URL • HTML • Hex • Binary • ROT • Vigenère • JWT
The EasyTools Universal Encoder & Decoder converts between common developer encodings and simple ciphers instantly.
It uses modern TextEncoder/TextDecoder for Unicode correctness and runs fully in your browser for privacy.
How to Use
- Choose a method from the dropdown (e.g., Base64 or URL encoding).
- Paste or type your text in the input box.
- Click Encode or Decode to transform.
- Use Copy or Download to keep results.
When this tool is useful
- Debugging API requests and responses that use Base64 or URL encoding.
- Checking or cleaning HTML entities before rendering on a web page.
- Inspecting JWT header and payload in a safe, local way.
- Teaching students how classic ciphers like ROT13, Caesar and Vigenère work.
Privacy note
Everything runs inside your browser. EasyTools does not upload your text, tokens or JWTs to any server. This tool is designed for
learning, debugging and light development use – it is not a full cryptography or security audit tool.