Lock or unlock PDF files
Add or remove PDF password protection. AES-128 encryption. Free and private.
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Tips
- Minimum password length is 4 characters.
- Use a strong password with upper/lower case, numbers and symbols.
- You must know the original password to unlock a file.
How to use
1
Upload your PDFSelect the PDF you want to lock with a password or unlock.
2
Lock or unlock modeTo lock: enter your desired password. To unlock: enter the existing password to remove it.
3
Download the resultClick "Apply" and download the password-protected or unlocked PDF.
Why use OfflinePDFy?
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100% PrivateFiles never leave your device. Zero uploads.
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Instant & FreeNo account, no subscription, no limits.
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Works OfflineInstall as a PWA and use without internet.
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Any DeviceWorks on desktop, tablet, and mobile.
Frequently asked questions
What encryption is used to lock PDFs?+
AES-128 bit encryption is applied, which is the standard for PDF password protection.
Can I unlock a PDF without the password?+
No. If you have forgotten the password, the PDF cannot be unlocked without it.
Is my PDF uploaded when locking/unlocking?+
No. All encryption and decryption happens locally in your browser.
Is PDF locking and unlocking free?+
Yes, completely free with no account required.