Encrypt File
Encrypt any file with a password using AES-256-GCM before you email it or store it in the cloud. Only someone with the password can open it.
Free · No upload · 100% on your device
Choose files, or drop them here.
Any file type · Nothing is uploaded.
How to use Encrypt File
- Choose files, or drop it on the page.
- Choose the settings in the side panel.
- Select “Encrypt”.
- Download the result. Your original file is left unchanged.
Private by design. Everything you type, open or record is processed in this browser tab and is never uploaded to KittySuite.
About Encrypt File
The key is derived from your password with PBKDF2-SHA-256 and 600,000 iterations, then the file and its name are encrypted with AES-256-GCM, which also detects any tampering. The result is a .ksenc file that Decrypt File on this site opens. Share the password through a different channel than the file.
Your files are read in this browser tab and never uploaded. Nothing is stored after you close the page, and there is no size limit beyond your device’s memory.
Encrypt File: frequently asked questions
How do I password-protect a file?
Choose the file, type a password twice and encrypt. You get a .ksenc file that only someone with the password can open.
How strong is the encryption?
The key is derived from your password with PBKDF2-SHA-256 and 600,000 iterations, then the file and its name are encrypted with AES-256-GCM, which also detects tampering.
How does the recipient open it?
With Decrypt File on this site and the same password. Share the password through a different channel than the file.
What if I forget the password?
There is no reset. Without the password the file cannot be recovered, so a long passphrase you can remember is best.