Password Protect a PDF — Instantly, Without Uploading It

Lock your PDF with a password in a few clicks. Your file is processed entirely in your browser — it never reaches any server.

Whether you need to protect a contract, an invoice, a confidential report, or a personal document, adding a password to a PDF is the simplest way to control who can open it. Most online tools require you to upload your file to a remote server — which means your sensitive data passes through third-party infrastructure before coming back to you. iSharePDF works differently: the encryption happens locally, inside your browser, using the PDF specification's native AES-256 standard. Nothing is ever transmitted.

Why Local Processing Makes All the Difference

• Zero upload, zero exposure. Your PDF is read and encrypted directly in your browser tab. No bytes are sent to any server — not even ours. Ideal for payslips, legal documents, health records, or any file you would not email in plain text.
• AES-256 encryption, no compromise. iSharePDF applies the same 256-bit AES encryption used by banks and enterprise software. The resulting file is compatible with Adobe Acrobat, macOS Preview, Foxit, and every major PDF reader.
• Free tier, no account required. You can password-protect up to 5 PDFs per day at no cost and with no registration. Need more? Pro starts at €4.99/month or €39/year — that is less than a coffee per month.
• Hosted in France, GDPR-compliant by design. Our infrastructure runs in the EU. And since nothing is uploaded, there is genuinely nothing to store, log, or share. No tracking, no analytics on your files.

How to Password Protect a PDF in 4 Steps

1. Open the tool. Go to /app/tools/protect — no account needed. You can also install the Chrome extension to access the tool directly from your browser toolbar.
2. Select your PDF. Click "Choose file" or drag and drop your document into the upload zone. The file is loaded into memory locally — it does not leave your device.
3. Set your password. Type the password you want to apply. Use at least 12 characters mixing letters, numbers, and symbols for strong protection. The strength indicator updates in real time.
4. Download the protected file. Click "Protect PDF". The encrypted file is generated in your browser within seconds and downloaded automatically. The original is untouched.

iSharePDF vs. Other PDF Password Tools