Free · No uploads · No account

Password Protect a File Online

Select a file, set a password, and download your protected file — processed entirely on your device.

Drop your item here, or browse for a

Supports most file types; practical size depends on your browser and device

Files are processed directly on your device. Nothing is uploaded to our servers.
Your files are processed locally. Nothing is uploaded.
Three simple steps

How to Password Protect a File

Password protect a file online by selecting it, creating a password, and saving the protected .vault copy. Processing happens in your browser rather than on a FileLocker server.

  1. 1Select your fileChoose the file you want to protect from your device.
  2. 2Create a passwordUse a strong password and keep it safe—FileLocker cannot recover a lost password.
  3. 3Save your .vault fileSave the protected copy, then use the unlock tool and the correct password to restore it later.

You can store or share the resulting .vault file as needed. To open it later, use FileLocker's unlock tool and the original password.

Why Password Protect a File Online with FileLocker?

No File Uploads

Your files are processed entirely within your browser using local JavaScript. Nothing is sent to a server at any point.

No Software Required

FileLocker runs directly in your web browser. There is nothing to install and no account to create.

Protect Common File Types

Protect documents, PDFs, spreadsheets, images, videos, ZIP archives, and many other file formats without changing the original file.

Large Files Supported

FileLocker uses streaming and browser storage APIs to reduce memory pressure when processing large files. Actual limits depend on your browser, device, available storage, and the file.

Protect Specific File Types

Follow a focused guide for the file you need to protect. Protect a folder instead →

Password protect a PDF →Password protect a ZIP file →Password protect an Excel file →Protect large video files →

Frequently Asked Questions

How do I password protect a file?

Select your file using the FileLocker tool above, enter a password, and click to protect. FileLocker will encrypt the file locally and save it as a .vault file to your device.

Is my file uploaded to a server?

No. FileLocker processes your file entirely within your browser. Your file is never sent to a server.

What types of files can I password protect?

FileLocker can protect many common file types, including documents, PDFs, spreadsheets, images, videos, ZIP archives, and other files.

Is there a file size limit?

FileLocker processes files in chunks to reduce memory pressure. Practical limits depend on browser support, available storage, device resources, and the file being processed.