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Protect PDF

Add a password to a PDF you own. Choose a strong password and download an encrypted copy locally — no upload needed.

Your file stays on your device.
Drop your PDF here
or choose a file
Accepted: PDF • up to 100 MB
No upload required Processed locally in your browser
Drag & drop works too.
LOCK
document.pdf
2.4 MB • 12 pages • ready to protect
If you forget this password the file cannot be opened — store it safely.
OPEN contract-locked.pdf
Browser WebAssembly
PROTECTED password set
Converting your document…64%
Processing securely in your browser. Your file never leaves this device.
✓
Your PDF is protected Processed locally — nothing was uploaded
document-protected.pdf
4.9 MB • Ready to download
Done

We couldn't convert this file

The document may be encrypted, damaged, or use an unsupported PDF structure. Try another file or check our guide for common fixes.

Your original file was not changed.
quarterly-deck.pdf
2.1 MB • 18 pages — waiting
Limit reached
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You've reached today's free limit

Continue with a Day Pass or upgrade to Pro — no need to create an account to review plans.

Day Pass Day Pass — $3.99 for 24 hours 24-hour access • one-time payment • never renews
Pro — best value Pro Monthly — $9.99 / month or Pro Annual — $89.99 / year • Save 25% All tools • higher limits • cancel anytime
Secure payment powered by Stripe • No card details handled by Enclodoc

How to protect a PDF

  1. 1Choose your PDF — drop it or click Choose PDF
  2. 2Set a password — typed only in your browser
  3. 3Download protected — encrypted locally, no upload

Why Enclodoc

  • ✓ Files stay on your device — closed tab clears memory
  • ✓ No unnecessary uploads and no server copies
  • ✓ Fast browser processing — no queues
  • ✓ Works without account for supported free usage

If a file ever needs a server step, we ask first — never silently.

Related tools View all →
FAQ — Protect PDF
✓Done