Cập nhật tháng 3 năm 2026

Unlock PDF — Remove PDF Password Free Online

Remove passwords from PDF files for free online. Enter the password once and download an unlocked, unrestricted copy. No signup required.

Thả tệp PDF vào đây

Upload a password-protected PDF to unlock it

Kích thước tệp tối đa 10 MB. Đăng ký để biết thêm.

How to Unlock a PDF Online

Xóa mật khẩu khỏi tệp PDF của bạn sau vài giây để bạn có thể mở nó một cách tự do.

Upload Your Protected PDF

Drag and drop your password-protected PDF file onto the upload area, or click to browse your files.

Enter the Password

Type the PDF password into the password field. This is the password you normally use to open the file.

Download Unlocked PDF

Click "Unlock PDF" and download your unlocked file. The PDF is now fully accessible without any password.

Why Choose Our PDF Unlocker

Instant Unlock

Enter the password and get an unlocked PDF in seconds, ready to view and edit freely.

No Quality Loss

Mật khẩu bị xóa mà không cần mã hóa lại. Nội dung PDF của bạn vẫn giống hệt nhau.

Tải lên được mã hóa, tự động xóa

Your PDF is uploaded over HTTPS and automatically deleted from our server after processing. No copies are retained.

No Installation Required

Works entirely in your browser. No software to download or install.

Browser-Based, Any Device

Mở khóa tệp PDF từ mọi trình duyệt trên điện thoại, máy tính bảng và máy tính mà không cần cài đặt phần mềm máy tính để bàn.

Remove All Restrictions

Removes password protection so you can print, copy, and edit your PDF without limitations.

Câu hỏi thường gặp về Trình mở khóa PDF

Common questions about removing PDF passwords, security, and supported encryption types.

How does the PDF unlocker work?

Upload your password-protected PDF, enter the correct password, and the tool removes the encryption. You download an identical PDF with all content preserved but no password required to open it.

Can I unlock a PDF without knowing the password?

No. You must know the PDF's password to unlock it. This tool removes encryption from PDFs you have authorized access to — it does not crack or bypass unknown passwords.

Will unlocking affect the PDF content or quality?

No. Unlocking only removes the encryption layer. All text, images, fonts, annotations, and formatting remain exactly the same in the output file.

Hỗ trợ những loại mật khẩu PDF nào?

This tool handles both user passwords (required to open the PDF) and owner passwords (that restrict printing, copying, or editing). Enter the password and all restrictions are removed.

Tệp PDF của tôi có an toàn trong quá trình xử lý không?

Yes. Your file is uploaded over encrypted HTTPS, processed on our servers, and deleted immediately after you download the result. We never store or access your documents.

Can I unlock multiple PDFs at once?

Currently the tool processes one PDF at a time. Upload each file individually with its password to unlock them.

Nếu tôi nhập sai mật khẩu thì sao?

The tool will show an error message indicating the password is incorrect. Re-enter the correct password and try again. There is no limit on password attempts.