Free PDF Password Protector Online Encrypt & Protect PDF
Free PDF password protector. Add encryption to any PDF instantly — processed in your browser, nothing uploaded to any server.
Free PDF Tool
Protect PDF.
Add a Password. Free. Instant.
Password protect your PDF to prevent unauthorised access. Nothing uploaded — encrypted entirely in your browser using pdf-lib.
No sign-up100% freeFiles never uploadedWorks on iPhone
PDF Password Protector
🔒
Drop your file here
or click to browse
PDF only · Max 100MB · Never uploaded
🔒
Processing...0%
Something went wrong. Please try a different file.
✅
Done!
Your file is ready
🔒
100% private
Processed in your browser only
⚡
Instant
No waiting, no queue, no server
🗑
Auto deleted
Wiped from memory on download
📱
Works everywhere
iPhone, Android, any browser
Related Tools
More from Kaeltripton — UK Finance Guides
Free PDF Password Protector — No Upload Required
Add a password to your PDF to prevent unauthorised access. Encryption is applied using pdf-lib entirely in your browser — your document never leaves your device.
When to password protect a PDF
- Sending sensitive contracts or financial documents by email
- Protecting CVs or personal documents before sharing
- Restricting access to confidential business reports
- Adding security to invoices containing payment details
Your privacy
Your PDF is encrypted locally in your browser using pdf-lib. Nothing is uploaded to any server. The password-protected PDF downloads directly to your device.
Frequently asked questions
Is this PDF protector free?+
Yes — 100% free, no sign-up, no email, no payment.
Are my files safe?+
Your PDF never leaves your device. Encryption happens locally in your browser.
What encryption does it use?+
pdf-lib applies 128-bit RC4 encryption, compatible with all modern PDF readers.
Can I remove the password later?+
Use a PDF unlock tool (or open in Adobe Acrobat with the password and re-save without one).
Does it work on iPhone?+
Yes — Safari on iPhone/iPad, Chrome on Android, all modern browsers.
