Encrypt text with AES-GCM and a passphrase

Developers and security teams use AES-GCM Encryption when preparing a check, a local test or integration data.

Encrypt text with AES-GCM and a passphrase, then keep or pass on the resulting package. Use it for free in your browser, with no account required.

How to use

Enter the passphrase that will protect the content, and store it separately so you can decrypt later.
Paste or type the text you want to encrypt into the input area.
Start encryption to produce a package that represents the protected text.
Copy that package and send it through the channel you prefer, without forgetting the passphrase.
Clear the original text and passphrase if the device is shared.

Example

Picture preparing a configuration note to send to a colleague. You enter the note, choose an agreed passphrase, then get the package. Your colleague will need the same passphrase to restore the text.

Limits and formats

A lost passphrase makes the package unusable; the tool provides no recovery.
The package is not meant to be edited by hand, or it may no longer decrypt.
Security mainly depends on how strong and private your chosen passphrase is.
The tool does not sign your identity and cannot prove who created the package.

Where processing happens

Encryption runs inside your browser. The text and passphrase do not leave your device and are not sent to any service. Once you have the package, keeping it safe and passing the passphrase through another channel is up to you.

Frequently asked questions

What passphrase should I choose?

Pick a long phrase that is hard to guess, unique to this package, and keep it in a password manager. A short or widely reused phrase makes it easier for someone else to recover it.

Can I encrypt a whole file?

The described workflow handles text you type or paste. For a file, copy its text content when possible, otherwise use a tool built for binary formats.

Can another person read the package?

Without the passphrase, the content is not readable through this tool. Anyone who has the passphrase can decrypt it, so send that secret through a secure channel.