These guides explain parameters and limitations, not a claim that a single browser tool implements every encryption format. For an existing ciphertext, identify its envelope and key derivation before changing settings. For new password-based examples, use the versioned GCM package and test recovery before relying on a saved copy.
aes-encryption.comAES · GCM / CBC / CTR
AES Guides: Keys, Modes and Recovery
Start with the question you are trying to answer, then use the linked tool with public test data.