Protect PDF
Adds password protection to your PDF. Note: this tool uses a browser-based approach that may affect text selectability in some PDF viewers.
Browser-based encryption
Pages are re-rendered as images during encryption — text inside the PDF becomes non-selectable. For true enterprise-grade encryption that preserves selectable text, use Adobe Acrobat or another desktop tool.
Drop your PDF here, or click to browse
PDF up to ~100 MB · stays on your device
Note: pages are re-rendered as images during encryption — text becomes non-selectable. Stronger text-preserving encryption is on the backend roadmap.
Updated 2026 · Maintained by the CrispPDF team
Sensitive documents—bank statements, tax returns, medical records—deserve strong protection before leaving your device. CrispPDF's Protect tool applies AES-256 encryption and optional permission restrictions with a few clicks.
Set an open password (required to view), an owner password (required to edit or print), or both. Choose which actions to allow: printing, copying text, filling forms. Download the secured PDF and share confidently.
Because encryption happens in your browser, your password and file never leave your machine. There's no external server storing credentials—only you control access.
For Indian users encrypting bank statements before email, the workflow is instant. For professionals protecting NDAs or contracts, it's the same: set a strong password, download, send. After protecting, explore related tools: compress the encrypted file for email or add a watermark before locking.
// How to use
How to use Protect PDF
- 1
Upload the PDF
Drop the PDF you want to secure with a password.
- 2
Set a strong password
Enter a password (and optionally an owner password) and pick AES-256 encryption.
- 3
Choose restrictions
Optionally restrict printing, copying, or editing without the owner password.
- 4
Download the protected PDF
Save the encrypted PDF — password and file never leave your browser.
// Why CrispPDF
Why use CrispPDF for protect pdf?
CrispPDF runs entirely in your browser — your files never touch a server. No signup, no watermarks, no daily limits, no upsells. We built it because every other PDF site is slow, ad-stuffed, or hides the good features behind a paywall. CrispPDF is fast on a phone, fast on a laptop, fast on a 10-year-old machine. Output is byte-clean: signatures stay sharp, compressed PDFs stay readable, conversions preserve layout where the source allows. And because nothing leaves your device, even confidential documents are safe to process. Bookmark this page, share it with your team, and stop juggling five different PDF sites for five different tasks.
- No signup, no email gate
- No watermarks on output
- Files never stored on a server
- Works on phone, tablet, and desktop
// FAQ
Protect PDF — frequently asked questions
+How to set a password on my PDF document?
Upload to CrispPDF, enter your chosen password, click Protect, and download the secured file.
+Can I lock a PDF on my mobile phone?
Yes. CrispPDF works in Chrome and Safari on iOS and Android.
+Is the password encryption safe for bank files?
Yes. AES-256 is the same encryption standard banks use internally.
+How do I password protect a PDF file?
Drop it into CrispPDF, set a password, download the encrypted result.
+Can I prevent someone from printing my PDF?
Yes. Set an owner password and disable the 'allow printing' option.
+How secure is PDF password encryption?
AES-256 is extremely strong—brute-forcing it is computationally infeasible with a good password.
+Should I password-protect a salary slip before emailing it?
Yes — salary slips carry your name, PAN, bank account, and CTC. Set an AES-256 password here and share the password over a different channel (a call or message, not the same email thread).
+How do I protect an offer letter or appointment letter?
Upload it, choose a password, and optionally block copying and editing so the recipient cannot lift your compensation details into another document. Encryption is applied in your browser.
+Is it safe to protect a medical report online?
On CrispPDF, yes — the report and the password never leave your device, so an encrypted medical record is created locally and only the encrypted copy is ever shared.