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Password Protect a ZIP File

Lock your files in an AES-256 encrypted ZIP that opens in 7-Zip, WinRAR and The Unarchiver.

or drop files here

Encrypted upload. Files are deleted automatically after 1 hour.

About Password Protect ZIP

Password protect ZIP archives before you email payslips, send a contract to a client or park backups in cloud storage. Upload your files, set a password and download a ZIP encrypted with AES-256, the WinZip format that 7-Zip, WinRAR, Bandizip and The Unarchiver all open. The ZIP viewer built into Windows can't read it, so point the recipient to one of those apps.

If you already have a ZIP, upload it and we repack its contents under the password, so nobody has to unzip twice. One thing to know: ZIP encryption hides what's in the files but not their names, which anyone can still see in the list. If the names themselves are sensitive, rename the files first.

How to use Password Protect ZIP

  1. 1
    Add your files

    Choose or drop the files to protect, up to 20 per task on a free plan and 50 with VIP; an existing ZIP counts as one file.

  2. 2
    Set the password twice

    Type it in Set a password and again in Repeat password, so a typo can't lock you out.

  3. 3
    Click Password Protect ZIP

    We pack and encrypt the files in an isolated process on our server.

  4. 4
    Download the locked ZIP

    Save the ZIP, then share the password through a different channel, such as a phone call or a text message.

Why use Cubfile for this

  • Real AES-256 encryption

    Not the old ZipCrypto scheme, which is easy to crack. Every file is encrypted with AES-256 in the WinZip format.

  • Opens in common unzip apps

    7-Zip, WinRAR, Bandizip and The Unarchiver ask for the password and open the ZIP on Windows and Mac.

  • Lock an existing ZIP

    Upload a ZIP and its contents are repacked with your password, so photos.zip comes back as photos_protected.zip.

  • Several files, one ZIP

    Lock up to 20 files in one go, or 50 with VIP; they arrive together in protected_files.zip.

FAQ

Password Protect ZIP: questions and answers

Can people see what's inside a password-protected ZIP?
They can see the file names and sizes, but they can't open or read any file without the password. If the names give too much away, rename the files before you upload them.
How do I password protect a ZIP file on Windows?
You don't need extra software. Upload the files here, set a password and download the encrypted ZIP. To open it later, use 7-Zip or WinRAR, because the viewer built into Windows doesn't support AES-256. On a computer without either app, Unzip Online opens it in the browser with the password.
Can I password protect a ZIP for free?
Yes. Visitors get 2 tasks in total and free accounts 2 a day, with up to 20 files of 50 MB each per task. For more files, bundle them first with Zip Files, then upload that ZIP.
What if I forget the password?
Then the ZIP can't be opened. AES-256 has no back door and there's no reset, so keep the password in a password manager or somewhere equally safe.
Who else can see my files while they're processed?
Nobody. Uploads travel over HTTPS, each task runs in its own isolated process, and files are deleted automatically after one hour. We never look at, share or sell your files. If you'd rather keep a file on your device, Encrypt File locks it with AES-256 right in your browser.
Share Password Protect ZIP with a friendIt runs in any browser, and they can try it without signing up.

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