ONEPDF, a pro PDF converter that helps you make PDF easy without costing a penny. All OS is available. Perfect for both individuals and enterprises.
Tools
Convert to PDF
Word to PDF
Excel to PDF
PPT to PDF
JPG to PDF
PNG to PDF
DWG to PDF
Convert from PDF
PDF to Word
PDF to JPG
PDF to Excel
PDF to PNG
PDF to PPT
Optimze
Compress PDF
OCR PDF
Edit
Watermark
Remove PDF Pages
Add Page Numbers
Rotate PDF
Security
Unlock PDF
Encrypt PDF
Add Password to PDF
Encrypt a PDF document with a unique passport to protect your privacy
Privacy First- No Installation
- Fast & Free
Select PDF file
or drop PDF file here
Rated 4.88 out of 5 by 9693 users
How to Protect a PDF with Password
Upload PDF
Select or drag & drop the PDF file you want to protect into the box above.
Set PDF Password
Add password to PDF and wait for the encryption to process in seconds.
Download PDF
Click on Download to save the password-protected PDF on your device.Add Password to PDF for Protection
Add Password to PDF to Increase File Security
Password protection for PDFs is vital, especially when the file contains confidential information like personal identity data or financial statements. Locking your PDF enhances privacy and gives access to only people who know the password.
Password Protect PDF with High Encryption Levels
ONEPDF supports high encryption levels, ensuring that your document is out of reach to intruders. Encrypt PDFs with unique passwords and rest assured that no one will be able to infiltrate your PDF access code.
All-in-One PDF Locker to Manage Files Effortlessly
In addition to password protecting a PDF, ONEPDF allows you to effortlessly manage your PDF file. You can compress the file, add a watermark, delete unwanted pages, add numbers to the pages, and change the PDF to other document types like Word, Excel, PowerPoint, etc.
Why Choose ONEPDF
SSL Encryption
ONEPDF secures your PDF files and passwords with the strongest data protection system. Also, your data will be instantly deleted from our server after the file is processed.
Runs on All Browsers
ONEPDF is a universal tool that’s compatible with all browsers. It’s a web-based tool that simply needs a stable internet connection to protect PDF with password and everything will be done online.
Easy to Use
Encrypting PDF files on ONEPDF is straightforward. This tool has a user-friendly interface that allows everyone to get password-protect PDF in 3 steps without trouble.
Fully Featured
ONEPDF is an all-in-one tool that can work on every device, including iPads, mobile phones, desktops, and laptops. It also supports various operating systems like Windows and Mac.
Free for Everyone
ONEPDF offers free services to Lock PDFs. You don’t need to pay any fee to enjoy all its features and protect your PDF with a password.
Efficient PDF Protection
ONEPDF is built with industry-leading security standards to guarantee your PDFs. Its speed to add the password to your PDF is fast and the encryption is difficult to bypass.
ONEPDF Tools to Manage Your Files
Our PDF online free tool is a one-stop shop for all your document needs. It enables various functions required for the management and modification of your files.
More About Password Protected PDF
Why is my PDF showing as password-protected?
- There are various reasons why your PDF is showing password-protected, but the most common ones are:
- • Security Settings: Someone who has access to the PDF may have encrypted the file intentionally or unintentionally, thereby denying you access.
- • Organization Policy: If the PDF is from an organization, it might be a standard policy to password-protect PDF files, ensuring that only authorized stakeholders can access them.
- • Secure Source Downloads: If the PDF is downloaded from a secure source like an academic journal or corporate portal, it might be protected to restrict unauthorized access. Sometimes, you have to pay to get the password.
How do I put a password to a PDF file?
- The best way to password a PDF file is to use ONEPDF. The processes involved have been streamlined to a few steps, allowing you to lock your PDF without stress.
- These are the steps involved:
- • Open onepdf.tinyfrom.com on your device’s browser.
- • Click on the Encrypt PDF tab.
- • Upload the PDF file you want to password-protect.
- • Set the password.
- • Click on Download to save the password-protected PDF on your device.
How to add password protection for PDFs without Adobe?
- Using Adobe to password-protect PDFs is not cost-effective. You have to pay before enjoying the privilege of encrypting your PDF documents.
- It’s recommended to use ONEPDF instead. It is free; all its features are available to everyone. To add password protection to PDF using ONEPDF, simply upload the PDF document, type the password you want to use, and download the password-protected version of your PDF to your device.
How to protect PDFs with a password in Adobe Reader?
- Adobe Reader itself does not have the PDF password protection feature. You have to upgrade to Adobe Acrobat, which is an advanced version of Adobe Reader to successfully encrypt your PDF.
- Here are the steps involved:
- • Download, install, and launch Adobe Acrobat.
- • Open the PDF you want to password-protect.
- • Navigate to the right side, click on Tools, and then select Protect.
- • Choose Encrypt from the Protect toolbar, and then click on Encrypt with Password.
- • Select Require a Password to Open the document and input the password you want to use. Re-enter the password for confirmation.
- • Click OK to save the password-protected PDF on your device.
How do I lock a PDF file?
- Simply lock a PDF by using ONEPDF. On any of your devices, open your preferred browser, and go to onepdf.tinyfrom.com. Navigate to the tool sets section and click on Encrypt PDF. Upload the PDF file you want to lock, set the password, and click on Download to save the password-protected PDF file on your device.