How to AES Decrypt Text
AES Decryption
When to Decrypt AES Ciphertext
Decrypt AES-encrypted payloads from config files, debug encrypted API responses, or verify round-trip encryption during development. Paste Base64 ciphertext and the same passphrase used during encryption to recover the original plaintext locally.
Requirements for Success
Decryption requires the exact passphrase, algorithm, and mode used during encryption. Mismatched keys or corrupted ciphertext produce errors rather than partial output. Ensure ciphertext was produced by the same tool settings or compatible library.
Developer Tips
- Test encrypt/decrypt round-trip on sample data before production integration
- Store keys in secret managers — not in source code or shared documents
- Clear decrypted plaintext from the page after inspection on shared machines
Frequently asked questions
Why does decryption fail with a valid-looking key?
Wrong passphrase, different algorithm mode, or corrupted/truncated ciphertext are common causes. Verify settings match the encryption step exactly.
Is decrypted output stored anywhere?
No. Decryption runs in your browser only. Clear sensitive plaintext after copying.