PDF加密

密碼保護PDF是免費的在線工具,無需Acrobat即可保護,加密和添加密碼來保護PDF。 易於使用,沒有任何限制。

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or Drop File(s) here

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How to password protect a PDF

Secured PDF, add password to PDF made easy.

1. Select PDF files to protect

Select the PDF files you want to protect with a password or drag & drop them into the required area. You can also upload PDF files from a cloud storage service like Google Drive, Dropbox.

2. Secured PDF

Enter a password for your PDF documents and confirm it.

3. Download

Our free PDF Converter online will protect your PDF files in just seconds. Your new PDF file will be ready to download immediately.

Password protect PDF Features

Encrypt PDF unlimited.

Secured PDF Online Free

PDFStuff is as simple as an effective conversion tool for the fastest ways to encrypt PDF without Acrobat. It's easy to use without any limitation and restriction.

We Speak Your Language

Wherever you are in the world, and you need to be. PDFStuff has been translated up to 25 languages, we speak your language!

Encrypt PDF Entirely Secure

We care about the safety of your data. Our free PDF converter processes your files with a 256-bit SSL encryption. It means that your documents and data are secure.

Confidentiality

We only store your PDF files on our server for 24 hours to limit any unauthorized access. It is then permanently removed from our servers. Please read our privacy policy.

Cloud Storage Access

You can access files saved in cloud storage systems like Google Drive, Dropbox. This allows you to take your PDF files from the cloud, secured PDF online and save them back to your cloud storage accounts.

Encrypt PDF on Any Device

Our free PDF converter online works perfectly on all devices, on any OS, including Windows, Mac, and Linux, and popular browsers: IE, Firefox, Chrome & Opera.