ChaCha20 Online Encryption/Decryption

ChaCha20, ChaCha20-Poly1305 and XChaCha20 encryption/decryption tool. Supports AEAD authenticated encryption, multiple input/output formats. Secure and fast, runs entirely in browser.

ChaCha20: 256-bit stream cipher, 96-bit nonce. Fast and secure, no authentication.

Key (256 bits / 32 bytes)

Nonce (96 bits / 12 bytes)

Counter (32-bit)

Initial block counter value (usually 0 for encryption, use same value for decryption)

Format Options

Plaintext Input Format

Ciphertext Output Format

Input

Documentation

This tool performs local ChaCha20/XChaCha20 encryption/decryption, including Poly1305 authenticated variants for AEAD workflows.

Key Features

ChaCha20 and ChaCha20-Poly1305 support
XChaCha20 and XChaCha20-Poly1305 support
AAD and authentication tag handling
Multiple input/output encoding formats

Steps

Select algorithm and encrypt/decrypt mode.
Configure key, nonce, counter, and formats.
Provide AAD or auth tag when using AEAD.
Process and copy output.

Notes

Never reuse nonce with the same key.
AEAD decryption requires a correct authentication tag.
Parameter mismatch can cause decryption/authentication failure.

Related Tools

Documentation

Key Features

Steps

Notes