AES encryption

Encrypt and decrypt text with a local AES-GCM key.

On your device · No account

Privacy details

AES encryption processes your input in this browser. Inputs and results are excluded from analytics. Recent tools save tool names, visit counts and last-visit times. Saved tools store only their names. Draft saving is optional and stays on this device; delete saved text with the draft controls. Loading text from a URL is optional and contacts that server; its URL and your IP address are visible to the server. An optional “Use in” action keeps a handoff in this tab. The next tool removes it on arrival and ignores it if more than a minute has passed.

Copy link includes the inputs you choose to share in the address. Anyone with that link can reopen them. Files and generated results are excluded. Password and key tools share settings only.

Your input

Action

Your key and local file

Save the key separately. It is not included in the encrypted download.

AES key (save separately)

Open a text file on this device

Optional settings apply only to this tab.

Your result

Reset reloads the tool with its starting values and releases open files and device controls. Saved drafts stay on this device until you delete them.

Links include your inputs and settings. Anyone with the link can see them, so leave out private text. Files and generated results are left out; random draws run again.

Keyboard shortcuts

Updated 2026-09-20

AES encryption explained

Encrypt UTF-8 text with AES-256-GCM using a random key generated in this tab, or supply your own hexadecimal key. Each encryption uses a fresh random nonce. Decryption checks authentication before showing any plaintext.

A worked example

Encrypting the same message twice produces different encrypted messages because each run uses a new nonce. Either message decrypts with the original key; a different key fails.

Before you use the result

The encrypted JSON format belongs to this tool. It is not a password vault or a password-based format. Keep the key separately and share it through a different trusted channel. The key cannot be recovered after this tab closes. This cannot protect against a compromised device or malicious browser extension.

Next: Hash generator checker

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ToolOctopus. “AES encryption.” Updated 2026-09-20. https://tooloctopus.com/aes-encryption.

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