Developer utilities
Encode and decode payload fragments, URLs, or Base64 strings while debugging integrations and APIs.
Encryption Tool
Encode, decode, encrypt, and decrypt text with Base64, URL encoding, ROT13, and AES-GCM in your browser.
How to use this tool
A quick workflow so you can get the result you need without guesswork.
- 1
Choose a mode such as Base64, URL encoding, ROT13, or AES-GCM.
- 2
Paste the text you want to transform and optionally add a passphrase for AES.
- 3
Encrypt, decrypt, encode, or decode the text and copy the result from the output panel.
Useful examples
Practical cases where this utility saves time and reduces mistakes.
Client-side encrypted notes
Encrypt short text with AES-GCM and a passphrase when you need a quick browser-based secure transformation.
Text transformation practice
Experiment with ROT13 and encoding basics when teaching or learning fundamental string transformations.
Frequently asked questions
Short answers to the most common questions about the calculator above.
What modes are included?
The tool supports Base64 encode/decode, URL encode/decode, ROT13, and AES-GCM encryption and decryption with a passphrase.
Is AES encryption performed in the browser?
Yes. AES-GCM uses the browser Web Crypto API so the plaintext and passphrase do not need to be sent to a server.
What do I need to decrypt AES output?
You need the exact encrypted bundle generated by the tool and the same passphrase that was used during encryption.
Is Base64 encryption?
No. Base64 is an encoding format, not encryption. It transforms binary or text data into ASCII characters but does not secure the content.
Encode, Decode, Encrypt, and Decrypt Text in One Tool
This browser-based encryption and encoding tool bundles several common text transformations into one page. You can handle Base64 encode and decode tasks, URL encoding, ROT13 transformations, and AES-GCM text encryption with a passphrase. That makes it useful for development, testing, and quick private note handling.
The page is especially handy when you need a lightweight utility rather than separate tools for each format. Switching between modes is quick, and the output stays easy to copy into another application.
Useful for APIs, Debugging, and Secure Local Transformations
Developers often need to inspect encoded values while working with headers, tokens, redirect URLs, and payload fragments. Having Base64 and URL helpers next to each other saves time. For simple encryption needs, the AES-GCM option uses the browser crypto stack so encryption happens locally.
This page is not a replacement for a full key management system, but it is practical for quick transformations and educational use where browser-side processing is enough.
Related tools
Keep moving with other free browser-based utilities on HandyUtils.