Developer Tools
Encrypt text with RC4 instantly using a passphrase-based browser tool.
Use this RC4 Encrypt tool to encrypt plain text with RC4 and return Base64 ciphertext. It is useful for legacy compatibility testing, reversible crypto demos, browser-side experiments, and understanding how passphrase-based RC4 transforms readable input into encrypted output.
Use this RC4 Encrypt tool to encrypt plain text with RC4 and return Base64 ciphertext. It is useful for legacy compatibility testing, reversible crypto demos, browser-side experiments, and understanding how passphrase-based RC4 transforms readable input into encrypted output.
Use rc4 encrypt when you need a fast browser-based result without extra setup. It works well for quick checks, one-off tasks, and routine formatting or calculation work.
Read step-by-step usage guidance, best practices, and common mistakes.
See common questions and answers about input, output, and tool usage.
Review practical input and output examples before running the tool.
Find similar and supporting tools for adjacent actions and follow-up tasks.
Input
legacy-key hello world
Output
Base64 encrypted text
Useful for creating a simple RC4-encrypted sample.
Input
demo-pass api_key=12345
Output
Base64 encrypted text
Useful when testing passphrase-based RC4 output on short strings.
Fix: Put the passphrase on the first line and the plaintext below it.
Fix: RC4 decryption requires the exact same passphrase.
Fix: Passphrase first, plaintext below.
Fix: RC4 is mainly useful for legacy compatibility, demos, and experiments.
Fix: This tool returns Base64 ciphertext.
It encrypts text with RC4 and returns Base64 ciphertext.
Put the passphrase on the first line and the plaintext below it.
It returns Base64 ciphertext.
It is mostly useful for legacy compatibility and testing.
The reverse tool is RC4 Decrypt.