DoctorConverter
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Password Protect and Encrypt PDF Files

Secure confidential documents, payrolls, and contracts with strong password encryption. Only those with the password can open them.

Drop your file here

or choose from your device

PDF Files are only sent when you start the job.

Start the job

  • 10.0 MB per file
  • Up to 1 files
  • 300 pages
  • Kept for 60 minutes

Uploaded files are stored temporarily and removed when they expire. An accepted job keeps running even if you close the page.

Good to know
The result depends on the source document and the settings you choose.

3 easy steps

How to use Password Protect PDF

No software to install, just a few steps in your browser.

  1. 1

    Choose your file

    Select the PDF you want to protect.

  2. 2

    Start the job

    Enter a strong password to lock the document.

  3. 3

    Download

    Download your secure 256-bit AES encrypted PDF.

Why DoctorConverter?

Free, no sign-up, and your files are only kept temporarily.

256-bit AES encryption

Military-grade encryption protects your files from unauthorized access.

Free, no install

No software to download and no account to create. It runs in any browser.

Private by default

Encrypted transfer, session-only access and automatic deletion when files expire.

Frequently asked questions

Common questions about Password Protect PDF.

Can I recover the password if forgotten?

No. For your security, we never store your passwords or keys.

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Remove passwords from protected PDFs if you know the password.

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SECURITY & ARCHITECTURE

Why DoctorConverter? Privacy and Performance Standards.

Isolated RAM Processing

Files are processed in an isolated sandbox environment without persistent storage and never shared with AI models.

Native Open-Source Engines

Powered by industry-standard QPDF, PyMuPDF, LibreOffice Impress and Tesseract OCR.

Instant Disposal & Zero Traces

Delete files immediately with one click after processing, or rely on automatic session cleanup.

Your Files Belong Strictly to You

DoctorConverter protects all data transfers with end-to-end TLS encryption. No document archives are kept on our infrastructure.

Frequently Asked Questions

Is DoctorConverter really free?

Yes. PDF conversion, merging, compression and all everyday document operations are 100% free with no sign-up.

Where do my files go and when are they deleted?

Your files are transmitted securely over TLS into memory. You can click "Delete files" anytime to erase them instantly, and the system automatically purges temporary data.

Does PDF to Word or Excel preserve the original layout?

Text-based PDFs are reconstructed into clean Word and Excel documents with typography, tables and columns preserved.

Which file formats are supported?

PDF, DOCX (Word), PPTX (PowerPoint), XLSX (Excel), JPG and PNG. Password-protected PDFs can be unlocked using our Unlock PDF tool.