freesabaiEncrypt a file with a password
Lock any file with a password to get a .fsenc file that cannot be opened without it, and unlock it back to the original here. It runs in your browser; the file and the password stay on your device.
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Strength:
How to use it
- Choose a file or drop it on the box. Any kind of file, up to 500 MB.
- Set a password and type it again. Press "Encrypt the file" and you get the same name with .fsenc added.
- To open it again, choose the .fsenc file, enter the password and press "Unlock the file": you get the original back under its original name.
How safe is it
- It uses AES-256-GCM, which encrypts and also checks the file was not changed. The key is made from the password with PBKDF2-SHA-256 at 600,000 rounds, through the browser's own Web Crypto, with no outside library.
- The original file name is encrypted inside too. A .fsenc file does not say what it holds (only roughly how big it is).
- A forgotten password cannot be recovered. We do not have it and cannot open the file. A wrong password and a damaged file cannot be told apart, so the tool says "wrong password or damaged file".
- The safety depends on the password. Use a long one that you use nowhere else, and send it to the recipient by a different route than the file.
- A .fsenc file opens only on this page (it is freesabai's format). If the recipient must open it with ordinary software, use Create a ZIP with an AES-256 password instead.
Your files stay on your device
Everything runs in your browser. The file and the password are not sent to freesabai's server or anyone else's, and nothing is kept in the browser: close the page and it is gone. The site only counts that this page was opened and how many times a result was saved (never the file name or content; you can turn counting off at the bottom of the site, see the privacy policy).
Report a problem or suggest an idea
Cannot unlock a file, or want something added? Tell us on the feedback page; no sign-up needed.
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Questions and answers
Can I recover a .fsenc file if I forget the password?
No. We do not have the password and cannot open the file. A wrong password and a damaged file cannot be told apart, so keep the password safe.
Can other programs open a .fsenc file?
No. It is freesabai's own format and opens only on this page. If the recipient needs ordinary software, make a ZIP with an AES-256 password instead.
Are the file and password sent to a server?
No. It runs in your browser with the browser's own Web Crypto and nothing is kept: close the page and it is gone.
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