AES-256 · Lock · Unlock · Batch · Free · 100% Private · No Server Storage
PDF Encrypt & Decrypt
Password protect your PDF with AES-256 military-grade encryption — or remove a password from any locked PDF.
Batch process multiple files, add watermarks, share via QR code. Files never stored on server — 100% private. Free.
Protect your confidential PDFs or recover access to locked documents.
🔒 Encrypt PDF
Lock your PDF with a password using AES-256 encryption. Restrict viewing, printing, and copying without the correct password.
AES-256 military-grade encryption
Password strength meter
Add watermark before locking
Batch encrypt multiple PDFs
Individual passwords per file
🔓 Decrypt PDF
Remove the password from a protected PDF. Recover full access to print, edit, copy, and share your document freely.
Remove PDF password restriction
Instant password removal
Batch unlock multiple PDFs
Download as unlocked PDF
Share via QR code or link
Key Features
Enterprise-grade PDF security — completely free.
AES-256 Encryption
The same 256-bit AES encryption standard used by governments, militaries, and financial institutions worldwide. Unbreakable without the correct password.
Batch Processing
Upload and process multiple PDF files simultaneously. Set a global password for all files or assign individual passwords per file — download all as a single ZIP.
Watermark Before Locking
Add a custom text watermark (CONFIDENTIAL, DRAFT, INTERNAL) diagonally across all pages before encryption — prevents unauthorized distribution.
100% Private · No Server Storage
Your PDF is never stored on any server — it processes and downloads directly to your device. If you use the optional Share feature, choose your link expiry: 1 Hour, 24 Hours, or 7 Days.
QR Code & Link Sharing
Share your processed PDF via a scannable QR code, a direct link, or directly to WhatsApp — easy sharing to mobile devices without emailing large files.
Live PDF Preview
Preview your PDF before processing — verify you've uploaded the correct file. Open in a modal or in a new tab for a full-page view.
How to Password Protect a PDF Free
Lock your PDF with AES-256 in under a minute.
1
Open the Tool & Upload Your PDF
Click "Encrypt or Decrypt PDF Free" above. Drag & drop your PDF or click to browse. Use Single File mode for one PDF or Batch Mode for multiple files.
2
Set Your Password
Type a strong password — the strength meter shows how secure it is. In Batch Mode, assign individual passwords to each file or use one global password for all.
3
Add Watermark (Optional)
Type watermark text like CONFIDENTIAL in the watermark field. It will be stamped diagonally across all pages before the PDF is locked.
4
Click Lock — Download Encrypted PDF
Click "Secure Lock". Your encrypted PDF downloads instantly to your device — never stored on any server. For batch jobs, click "Download All (ZIP)" to get all files in one archive.
Frequently Asked Questions
Everything you need to know about PDF Encrypt & Decrypt.
Open PDF Encrypt & Decrypt, upload your PDF, type a secure password, and click "Secure Lock". Your PDF is encrypted with AES-256 and downloads instantly — no signup required.
Upload your password-protected PDF, enter the correct password, and click "Unlock". The password is removed and the unlocked PDF downloads instantly — free, no account needed.
AES-256 (Advanced Encryption Standard with 256-bit keys) — the same military-grade standard used by governments and financial institutions worldwide. It is effectively unbreakable without the correct password.
Yes. Switch to Batch Mode, upload multiple PDFs, set individual or global passwords, and click "Lock All Files". All encrypted PDFs download as a single ZIP file.
No. Your PDF is processed securely and downloads directly to your device — files are never permanently stored on any server. If you choose to share via link, you can set expiry: 1 hour, 24 hours, or 7 days — your choice.
Yes. Type your watermark text (e.g. CONFIDENTIAL, DRAFT) in the watermark field before locking. It is stamped diagonally across all pages before encryption is applied.
Yes, completely free. Tooljin's free plan includes 20 tool opens per day. No account or credit card required.
Protect or Unlock Your PDF — Free
AES-256 encryption · Batch mode · Watermarks · QR sharing · No server storage.