File Encryption Tool - When To Use It And How
freetoolonline.com Editorial TeamFile Encryption Tool encrypts or decrypts one file with a password in this browser: pick a file, type a password, then press Encrypt for a protected .enc copy or Decrypt to get the original file back. Nothing is uploaded and nothing has to be installed.
When it fits
File Encryption Tool fits when you need to scramble a file with AES-256 in this browser - 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.
It protects one file at a time, and only for as long as the password stays secret, so it is not a substitute for full-disk or full-device encryption.
The three steps
Open File Encryption Tool. There is nothing to install, no sign-in and no account. Choose your file, then type a password in the Password box - the Encrypt and Decrypt buttons stay greyed out until both are filled in.
Press Encrypt to scramble a normal file, or Decrypt on a .enc file that this tool made. A Download link then appears with the finished file: the .enc copy when you encrypted, or your original file under its original name when you decrypted.
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.
How it compares with a desktop app or an upload service
This is one of three common ways to encrypt a file: a browser-based tool like this one, a desktop application, or an upload-based online service. Each trades off differently on where your data goes and what you need installed.
| Aspect | File Encryption Tool (this tool) | Desktop application | Upload-based online service |
|---|---|---|---|
| Where your data goes | Stays on this device - runs in the browser | Stays on this device | Uploaded to a server |
| Install required | No | Yes | No |
| Works without an account | Yes | Yes | Varies by service |
For a password that is hard to guess, generate one with the password generator first.
Why trust these tools
- Ten-plus years of web tooling. The freetoolonline editorial team has shipped browser-based utilities since 2015. The goal has never changed: get you to a working output fast, without an install.
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- Open-source core components. The processing engines underneath (libheif, libde265, pdf-lib, terser, clean-css, ffmpeg.wasm, and others) are public and audit-able. We link to each one in its tool page's footer.
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