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File Encryption Tool When To Use

File Encryption Tool is worth opening when you need a quick, one-off run without installing anything. This page covers when that fits and when it does not.


When it fits

The file is scrambled with AES-256 using a key derived from your password (PBKDF2, 250,000 rounds) plus a fresh random salt and IV every time, so encrypting the same file twice with the same password produces two different .enc files - that is expected, not a bug.


What to expect

A wrong password, or a .enc file that was edited or corrupted, is refused with a plain error message instead of producing a broken or garbage file.

The .enc file is about 32 bytes larger than the original due to a small header (a tag plus a fresh salt and IV), and your original filename is encrypted inside the file too, so Decrypt can restore it exactly without storing it separately.

There is no password recovery: this tool does not store your password anywhere, so a lost password makes the encrypted file permanently unrecoverable - write it down somewhere safe before you close this tab.

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Reviewed by the Free Tool Online editorial team · Tested in the current versions of Chrome, Firefox, Safari, and Edge before publishing. No account is needed to use any tool. Report a bug - we triage within 72 hours. · Last refreshed April 2026.

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