As secure as your password. AES-256-GCM and PBKDF2 are standard, well-studied algorithms built into every modern browser, and the salt and nonce are random each time. A long password – a few random words, or 12+ mixed characters – makes guessing impractical.

What if I forget the password?

The file can't be opened – there is no back door and nothing is stored on a server. Keep the password in a password manager.

How do I open the file later?

Come back to this page, drop the .gizke file on it and enter the password. The file comes back with its original name. The format is documented in the source code, so it can also be decrypted with a short script.

Are my files uploaded?

No. Encryption and decryption run entirely on your device; the page works offline once loaded, and the file never leaves your browser.

Encrypt Files with a Password – AES-256, Free

Password-protect any file or text with AES-256-GCM encryption, right in your browser. Encrypt photos, PDFs, videos or archives of any size and decrypt them later – nothing is ever uploaded.

Your files and password never leave this device.

Drop files to encrypt, or click to choose

Any file type and size – several at once is fine.

Password

Repeat password

There is no password recovery: without the password the file can never be opened again.

Encrypt any file with a password before you email it, put it on a USB stick or upload it to a cloud drive. Files are sealed with AES-256-GCM, the authenticated encryption used by HTTPS, using a key derived from your password with PBKDF2 (SHA-256, 600,000 iterations, a fresh random salt each time). Large files are processed in 1 MB chunks, so even multi-gigabyte videos work, and any change, reordering or truncation of an encrypted file is detected instead of silently giving you broken data. The original file name and type travel inside the encryption. Text mode turns a message into a block of Base64 you can paste anywhere. Everything runs with your browser's built-in Web Crypto – no upload, no account, no limits.

Encrypt Files with a Password – AES-256, Free

Frequently asked questions

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