Encrypt a file

Protect any file with a password before sending it, then decrypt it here. AES-256 encryption.

Processed on your device, nothing uploaded

In short

This tool protects any file with a password before you send it or store it in the cloud. The content is encrypted with AES-256-GCM, using a key derived from the password with Argon2id; the original name is encrypted along with it, and you can also hide it in the name of the output file. Several files are first gathered into a ZIP archive, then encrypted together. The result is an .enc file that only this tool can open: the recipient drops it here with the password. Without that password, the content cannot be recovered. For an archive that 7-Zip or WinRAR can open, use “Create or extract a ZIP” instead. The encryption happens in your browser.

How it works

Drop any file.
Choose a strong password.
Download the encrypted file; to open it again, drop it here with the same password.

Frequently asked questions

Which encryption is used?

AES-256-GCM, with a key derived from the password using Argon2id. The file's original name is encrypted too, and any tampering is detected.

Does the recipient need any software?

No: they open ElniDocs in their browser and drop the file there with the password. Share the password through a different channel from the file.

What if the password is lost?

The file can no longer be decrypted, by anyone.

Are my files sent to a server?

No. Everything is processed in your browser, on your device: no file is sent anywhere, neither to ElniDocs nor to anyone else. You can check this by going offline once the page has loaded: the tool keeps working.

Is it free? Do I need an account?

It is free, with no sign-up, no adverts and no watermark added to your files. The only limit is your device's memory (up to 500 MB per file).

Encrypt a file

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