Password Protect PDF Free Online
Protect PDF (Free)
Free Forever No Upload AES-128 Encrypted Browser-Based
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Upload
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Options
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Convert
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Your password is never sent to any server — encryption is done locally.
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Drop your PDF here
or click to browse · private & secure
PDF files only · up to 200 MB
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PDF Successfully Protected!
How PDF Password Protection Works
Frequently Asked Questions
Is the PDF actually encrypted, not just password-prompted?▾
Yes — we implement AES-128 encryption (Standard Security Handler Rev 4, ISO 32000-1) directly in your browser. The PDF content is cryptographically encrypted and cannot be opened without the correct password.
Are my files uploaded to any server?▾
Never. Your PDF is processed entirely inside your browser using JavaScript. No data is transmitted anywhere. Your file never leaves your device.
What if I forget my password?▾
There is no recovery mechanism. Once a PDF is encrypted, the password is required to open it. Store it in a password manager or secure location before downloading.
Do permission restrictions work in all PDF readers?▾
Permission flags are part of the PDF standard and respected by compliant readers like Adobe Acrobat, Apple Preview, Foxit, and most modern viewers. Some lightweight readers may ignore permission flags but will still require the open password to view the file.
Can I remove the password from the protected PDF later?▾
Yes — use our PDF Unlock tool to remove the password. You'll need the current password to unlock it.
Password Protect PDF Free Online — Secure at ConvertPDF.Live
Keep sensitive PDF documents secure with ConvertPDF.Live's free PDF password protection tool. Add an open password using AES encryption directly in your browser — no upload, no server, no watermark. A built-in password strength meter guides you to set a robust password. Perfect for protecting financial documents, medical records, legal contracts, or confidential reports before sharing. The encryption is applied locally, so your document content never leaves your device. Free forever at convertpdf.live — no software to install, works on any device.
- ✓ Add password to PDF free online
- ✓ AES encryption applied in-browser
- ✓ Password strength meter for better security
- ✓ No upload — encryption done locally
- ✓ No watermark on protected PDF
- ✓ No account or installation required
Frequently Asked Questions
What encryption does the PDF protector use? ▼
ConvertPDF.Live applies AES (Advanced Encryption Standard) encryption directly in your browser using PDF-lib, ensuring strong password protection.
Is the PDF password protection tool free? ▼
Completely free — no watermarks, no sign-up, and no charge for protecting your PDFs.
What happens if I forget the PDF password? ▼
There is no way to recover a forgotten password — make sure you store it securely. If needed, you can use the PDF Unlock tool with the correct password to remove protection.
Is my document private during the encryption process? ▼
Yes — encryption is done locally in your browser. Your PDF is never sent to any server, so your content stays 100% private.
Can I protect any PDF with a password? ▼
Yes — any standard PDF can be password-protected using this tool. PDFs that are already encrypted must be unlocked first.
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