AES Decrypt

This value is never sent to a server. Everything runs locally in your browser.

Ciphertext

Ciphertext encoding

Key input mode

Key

Mode

Padding PKCS7 (fixed)

IV (Initialization Vector)

What is this?

AES (Advanced Encryption Standard) is today's most widely used symmetric-key block cipher — the same secret key both encrypts and decrypts, with 128/192/256-bit key sizes. CBC mode chains each block with the previous one so identical plaintext blocks produce different ciphertext, while ECB mode encrypts blocks independently and can leak patterns, so it's rarely used in production. AES shows up everywhere from HTTPS and file/DB encryption to JWT's symmetric signing algorithms (HS*).