Drop PDF file here or
Your data is protected
How to Lock a PDF
- Upload Your PDF
Click the “Upload PDF” button to choose the PDF file you want to lock with a password. If you selected the wrong file, use the “Back” button to re-upload the correct one.
- Set Your Password
After uploading, you’ll see an option to enter a password for your PDF. Type in your desired password and click on the “Lock PDF” button to protect your file.
- Download the Locked PDF
Once the process is complete, you’ll be redirected to the download page. Click to download your password-protected PDF. To secure another document, click the “Back” button to return to the upload page.
Why Use a PDF Locker?
Enhanced Security: Protect your sensitive PDF content from unauthorized access.
Easy to Use: No technical skills required — lock your PDF in just a few clicks.
Keep It Private: Perfect for personal, business, or confidential documents.
Features
Password Protect Your PDF
Secure your PDF files by adding a password. Only users with the correct password can open and view the document.
Hide Sensitive Content
Prevent unauthorized access to confidential information by locking your PDF with strong encryption.
No Registration Required
Start locking your PDF instantly—no sign-up or personal information needed. Just upload, set a password, and download.
Preserve Original Quality
Your PDF’s content, formatting, and quality remain unchanged—only access is restricted by password.
Strong Encryption
PDFs are locked using industry-standard encryption, making it difficult for unauthorized users to bypass protection.
Easy Unlocking (with Password)
Anyone with the password can open the locked PDF in any standard PDF reader—no special software required.
Find answers to specific questions about locking PDFs with a password.
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What type of password protection is applied?The tool applies standard PDF password encryption, requiring the password to open and view the document in any PDF reader.
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Can I set permissions (like printing or copying) in addition to locking?No, this tool only sets an open password. It does not set additional permissions such as restricting printing or copying.
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Will the password be required every time the PDF is opened?Yes, the password must be entered each time the PDF is opened in any compatible PDF viewer.
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Can I remove the password later?You can remove the password using a PDF unlock tool, provided you know the current password.
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Is there a minimum or maximum password length?For best security, use a password of at least 8 characters. There is no strict maximum, but extremely long passwords may not be supported by all PDF readers.
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What happens if I forget the password?If you forget the password, you will not be able to open the locked PDF. Please store your password securely.
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Are digital signatures or form fields preserved?Digital signatures and form fields are generally preserved, but some PDF readers may invalidate signatures after locking. Please verify after downloading.
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Can I lock a PDF that is already password-protected?No, you must first remove any existing password before applying a new one with this tool.
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Will the file name of the output PDF change?The output file is named “locked.pdf” by default. You can rename it after downloading if you wish.
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Can I lock multiple PDFs at once?No, you can only lock one PDF at a time. To lock another, upload it after finishing the current one.
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Is the locked PDF compatible with all PDF readers?Yes, the locked PDF uses standard encryption and can be opened in any PDF reader that supports password-protected PDFs.
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Does locking a PDF reduce its quality or change its content?No, locking only adds password protection. The content, formatting, and quality of your PDF remain unchanged.