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.

Editorial Disclaimer

The content on Kaeltripton.com is for informational and educational purposes only and does not constitute financial, investment, tax, legal or regulatory advice. Kaeltripton.com is not authorised or regulated by the Financial Conduct Authority (FCA) and is not a financial adviser, mortgage broker, insurance intermediary or investment firm. Nothing on this site should be construed as a personal recommendation. Rates, figures and product details are indicative only, subject to change without notice, and should always be verified directly with the relevant provider, HMRC, the FCA register, the Bank of England, Ofgem or other appropriate authority before any financial decision is made. Past performance is not a reliable indicator of future results. If you require regulated financial advice, please consult a qualified adviser authorised by the FCA.

Chandraketu Tripathi

Finance Editor · Kaeltripton.com

Chandraketu (CK) Tripathi, founder and lead editor of Kael Tripton. 22 years in finance and marketing across 23 markets. Writes on UK personal finance, tax, mortgages, insurance, energy, and investing. Sources: HMRC, FCA, Ofgem, BoE, ONS.