Lock any file with a password using AES-256 encryption, and open it again later. Private, done in your browser.
Choose a file to protect with a password
Drag and drop a file here, or click the button. Any file type, up to 200 MB. To open a file made here, choose it too.
Your file and your password stay on your device. Everything is done in your browser and nothing is uploaded.
NinjaFunction's File Encryptor locks any file with a password using AES-256-GCM encryption, with the key made from your password by PBKDF2 (600,000 rounds). Choose a file, set a password or let the tool make a strong one, and download the locked file. To open it again, choose the locked file and type the password. The original file name is locked inside too, and any change to the file is detected. Your file and password never leave your browser.
| Part | What it is | Why it matters |
|---|---|---|
| AES-256-GCM | The encryption that locks the file | Strong, and it also detects any change to the file |
| PBKDF2, 600,000 rounds | Turns your password into the key | Makes guessing passwords very slow |
| Random salt and IV | Made fresh for every file | The same file and password give a different result each time |
| Your browser | Does all the work | Nothing is uploaded, so nobody else sees your file |
No. The file is locked and opened inside your browser using the encryption built into it. Your file and your password never leave your device, and we cannot read them.
The file is locked with AES-256-GCM, the same kind of encryption used by banks and password managers. The key comes from your password through PBKDF2 with 600,000 rounds, which makes guessing very slow. The real limit is your password, so a long and random one is best.
The file cannot be opened. There is no reset and no back door, because we never have the password. Save it in a password manager before you delete the original file.
Come back to this page, choose the file that ends in .nfenc, type the password and press Open the file. The original name and content come back exactly as they were.
Yes, if they use this page and know the password. The locked file is a special format, so it does not open in normal programs. If you need a file that opens in other software, a password protected ZIP or PDF is a better fit.
Yes. The original name is locked inside the file and comes back when you open it. The size of the file is still visible, roughly, because it is only slightly bigger than the original.
It will not open, and you will see a message that the password is wrong or the file has been changed. This is a safety check built into the encryption, which makes sure no one has altered the file.
Files can be up to 200 MB, because the whole file is held in your browser memory while it is locked. Very large files can be slow on a phone.
