How to Use KF-Cipher Desktop App
KF-Cipher is a free, portable Java desktop application that lets you encrypt and decrypt any file type — securely and completely offline. This guide walks you through every step with annotated screenshots.
Launch the App & Attach Files
Open KF-Cipher and select the files you want to encrypt
Double-click the downloaded KF-Cipher.jar (or .exe) to launch the application — no installation required. The main window opens immediately. To begin, click the Attach button in the left-side menu or the top toolbar. A file-picker dialog will appear — select one file or multiple files you want to encrypt.
Fig 1 — KF-Cipher main window. Click Attach to open the file selector.
Select Files & Click Encrypt
Check the files in the table and start encryption
The files you attached appear in the file table. Check the checkbox next to each file you want to encrypt, then click the Encrypt button. You can encrypt multiple files in one operation.
Fig 2 — Select files in the table and click the Encrypt button.
Enter Your Encryption Password
The password is part of the AES encryption key — choose a strong one
An encryption password dialog will appear. Enter a strong password — this password is fed into PBKDF2 to derive the AES-128 encryption key. You must remember this password — it is the only way to decrypt your files later. KF-Cipher does not store or transmit it anywhere.
Fig 3 — Enter and confirm your encryption password, then click Encrypt.
Encryption Complete
Your file is now AES-encrypted and secured
KF-Cipher displays a confirmation message with the name of the encrypted file. The encrypted file is saved to the same folder as the original. The original file is not deleted — you can safely remove it manually once you have confirmed the encryption was successful.
Fig 4 — Success confirmation showing the encrypted file name.
Decrypt Files
Restore previously encrypted files using your password
To decrypt a file, click the Decrypt button and select the encrypted file from your file system. The decryption password dialog will appear — enter the exact same password you used during encryption, then click Decrypt.
Fig 5 — Select the encrypted file and enter your decryption password.
Decryption Complete
Your original file is fully restored
KF-Cipher confirms the decryption and the restored file is saved to the same folder as the encrypted file. Your original content is back — ready to open and use.
Fig 6 — Decryption complete. The original file is restored to its folder.
Important Notes
