Add password to PDF

Protect a PDF with a password so only authorised users can open it.

Drop a PDF here or click to browse

Select a PDF to add password protection

Set a password

Choose a password to protect this PDF.

Password

Confirm password

Enter password

Enter the password to unlock this PDF.

⚠️ The unlocked PDF will be rebuilt as images to remove encryption. Text will no longer be selectable in the output.

PDF password

Processing…

Working…

✓

Done!

Original size

Output size

Why Protect with PDF Compressor Web?

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100% Private

Your files and passwords never leave your device. Encryption happens entirely in the browser.

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Lock & Unlock

Add password protection to any PDF, or remove a password from an encrypted file you already have access to.

⚡

Instant Processing

Encrypt or decrypt PDFs in seconds with a real-time progress bar. No waiting for server processing.

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Free & Open Source

No sign-ups, no limits, no ads. Protect as many files as you need, completely free.

How It Works

Choose mode

Select whether you want to add or remove a password.

Drop your PDF

Drag and drop or click to select your PDF file.

Download

Your protected or unlocked PDF downloads automatically.