Lock a PDF with a password and real AES-256 encryption
Set an open password and permission rules on a PDF, written with a real AES-256 security handler rather than a viewer-side trick.
Protect PDF (Encrypt) workspace
Drop files here or browse files
Drop a file here or browse to start.
- Real AES-256 document encryption
- Separate owner password for permissions
- Printing, copying and editing flags
- Password strength meter as you type
EditPDFKit rewrites your PDF with a standard security handler and an AES-256 encryption dictionary, so the document cannot be opened without the password and carries your printing and copying rules.
6 PDF Protection Superpowers (AES-256 Encryption • Permission Locks)
Encrypt confidential PDF documents with bank-grade AES-256 passwords and restrict unauthorized copying, editing, and printing.
Other tools upload your unencrypted document and password to their cloud servers. EditPDFKit encrypts your file 100% locally in your browser.
1. Military-Grade AES-256 Bit Encryption
Applies industry-standard 256-bit AES encryption to lock confidential files, rendering them unreadable without the correct password.
2. Restrict Copying, Editing & Printing
Prevent recipients from selecting text, copying data, modifying content, or printing physical copies of your PDF.
3. User Password & Owner Password Support
Set a viewing password required to open the document, plus an administrative owner password required to change security settings.
4. Secure Bank Statements & Tax Files
Lock sensitive financial statements, tax filings, legal agreements, and salary slips before sending them over email.
5. Zero Password Transmission Online
Cryptographic keys are derived locally on your device. Your password and document are never sent across the internet.
6. Universal PDF Viewer Compatibility
Encrypted PDFs open securely in Adobe Acrobat, Apple Preview, Google Chrome, Microsoft Edge, and all mobile PDF viewers.
Built and maintained by Akash Kore · About
How to Password Protect and Encrypt PDF Files Locally
Simple 4-step walkthrough for fast, secure processing
Add the documents
Drop in one PDF or a batch of them; every file in the queue is encrypted with the same settings.
Set the open password
Type a password or use the generator button, watching the strength meter as the characters go in.
Decide what readers may do
Set the printing level and the copying, editing and commenting switches, and add a distinct owner password if the restrictions matter.
Choose a cipher and save
Pick AES-256 unless an old reader forces otherwise, then encrypt and download the protected file.
EditPDFKit vs. Cloud Encryption Portals (Smallpdf & PDF2Go)
Why thousands of privacy-conscious users choose EditPDFKit over cloud converters
| Feature | EditPDFKit (editpdfkit.com) | Cloud Encryption Portals (PDF2Go, Smallpdf) |
|---|---|---|
| Where Files Are Processed | Directly on Your Device (Zero Uploads) | Uploaded to Remote Company Servers |
| Privacy & Safety | Zero Uploads • Files Never Leave Your Device | Files Uploaded and Retained on Remote Company Servers |
| Zero-Knowledge Password Handling | Cryptographic key derivation and AES-256 ciphering happen strictly inside browser WebAssembly; passwords never leave device memory | Transmits both your sensitive document and plaintext password across public internet to remote cloud servers |
| Granular Permission Restrictions (Owner vs User) | Set independent viewing passwords and fine-grained permissions to block printing, text copying, annotation changes, or form filling | Basic blanket password lock without granular permission control or locks permissions behind paid enterprise plans |
| Universal ISO 32000 PDF Compliance | Conforms strictly to Adobe and ISO 32000 cryptographic standards, opening seamlessly across Acrobat, Apple Preview, and mobile readers | Non-standard encryption wrappers that fail to open in mobile browsers or trigger security corruption warnings |
| 100% Free Unlimited Batch Encryption | Protect unlimited legal agreements, employee paystubs, and bank records with zero quotas or paywalls | Free tiers of cloud encryption tools commonly cap daily files or gate full AES-256 behind a paid plan; check their pricing pages for current limits |
| Built-in Privacy Vault | Saved Privately on Your Device (View or delete anytime) | Saved on Cloud Servers (Cannot verify if or when deleted) |
| Daily Usage Limits | 100% Unlimited & Free Forever | Free tiers commonly cap daily files; check their pricing pages |
| File Size Limits | No Limits (Process files of any size) | Free tiers commonly cap upload size; check their pricing pages |
| Works Without Internet | Yes • 100% Offline (Works without Wi-Fi) | No • Fails without constant internet connection |
| Account & Sign In | No Signup • No Login • Zero Email Required | Commonly requires an account or email to use fully |
| Watermarks on Your Files | 100% Clean • No Watermarks Ever | Free tiers commonly add a watermark or charge to remove it; check their pricing pages |
How Protect PDF (Encrypt) Works: Keep Your Files Safe & Private
See step-by-step how your files are processed. Everything happens right inside your browser — your files are never uploaded to the internet or shared with anyone.
1. Open on Your Device
When you pick a file, your browser opens it directly on your computer or phone. Your document stays on your device and is never uploaded anywhere.
2. Process in Your Browser
Your device does all the work right inside your browser. Because there are no server queues or waiting lines, your files are processed instantly.
3. Save in Private Vault
When you save your work, your file is stored securely inside your browser's private vault on your device. You can view or reopen it anytime, even without internet.
4. Download, Reuse, or Delete
Download your finished file, send it directly to another tool without re-uploading, or click 'Clear Vault' to permanently erase your files anytime with one click.
How You Can Prove Your Files Never Leave Your Device
Open this tool, turn off your Wi-Fi or turn on Airplane Mode, and drop your file. It will still edit, convert, or compress and let you download the result! This proves the tool works completely offline without sending anything to any server.
Press F12 on your keyboard (or right-click anywhere and choose "Inspect"), click on the Network tab, and process your file. You will see 0 bytes of your file sent over the web — absolute proof of 100% privacy.
AES-256 Encryption Standards, Password Protocols & Browser Security
Key features, device compatibility, and supported file types
Runs Directly on Your Device
Processed by your browser with zero waiting or upload lag
100% Private (0 Files Uploaded)
Safe for bank statements, IDs, tax forms, and confidential files
100% Watermark-Free
Clean original documents ready for official submissions
Drag & drop or paste directly from clipboard (Ctrl+V)
100% Free With No Limits
No account needed, no daily limits, no paywalls
Works on All Phones & Computers
iPhone, Android, Windows PC, Mac, iPad, and Chromebook
Need to Hit an Exact File Size Upload Limit?
Online job boards, immigration visa portals, universities, and court e-filing systems enforce strict KB ceilings. Select a calibrated target size solver below to compress without losing readability.
Legal & Court Portals
Strict compliance while keeping vector text razor sharp.
Exam, Job & Visa Portals
The ceiling UPSC, SSC, bank exam and visa forms set most often.
Job Portals & HR Forms
Ideal for resume attachments, certificates, and multi-page scans.
Email & Universities
Reduces large PDF decks under standard mail attachment limits.
Any Custom Limit
Set an exact target size with interactive compression preview.
Looking for a Free Alternative to Popular Cloud Tools?
Unlike cloud-based services that upload your files to remote servers or enforce hourly limits, EditPDFKit runs 100% in your browser.
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Frequently Asked Questions About Password Protecting PDFs
Everything you need to know about Protect PDF (Encrypt) on editpdfkit.com
How to get the most out of Protect PDF (Encrypt)
Written walkthroughs for the jobs people actually bring to this tool.