How to use this tool
Protect PDF
What this tool does
Protect PDF password-encrypts your document so only people with the password can open it. Use before emailing tax returns, medical records, financial statements, or HR files — especially when email itself is not encrypted.
Encryption runs locally with pdf-lib. Choose a strong password (minimum 4 characters) and share it through a separate channel (phone, Signal, not the same email).
Supported formats
Input: standard PDF (.pdf). Output: password-protected PDF requiring the password to open.
Password: minimum 4 characters. Same password used for user and owner access.
Step-by-step
Step 1: Upload your PDF.
Step 2: Enter a strong password (12+ characters recommended).
Step 3: Click Convert and download the protected PDF.
Step 4: Test opening with the password on another device before sending.
Limitations & tips
Browser encryption uses standard PDF password protection — compatible with Adobe Reader and most viewers. Does not restrict printing or copying separately (full owner permissions).
If you forget the password, the file cannot be recovered — store passwords securely.
Common use cases
Tax season: encrypt returns before email.
Medical records: password-protect patient summaries.
HR: secure offer letters and salary documents.
Privacy & local processing
Document Converter never uploads your file for conversion. Processing uses JavaScript in your browser tab — the same security boundary as editing a document offline. Closing the tab clears the in-memory copy unless you saved the output.
We may load analytics or ads when you visit the site, but those requests do not include your document bytes. For HR records, medical forms, or unreleased designs, local conversion avoids the third-party upload step that cloud converters require.
Browser-local vs cloud upload
Cloud tools like Smallpdf and iLovePDF receive your file via HTTP upload, process it on their servers, and return a download link. That model is convenient for public PDFs but adds privacy and compliance risk for sensitive content.
Document Converter runs pdf-lib, PDF.js, Mammoth, SheetJS, or Tesseract.js directly in your browser. Open DevTools → Network while converting: you should see no POST containing your file. You trade server-side CPU for device-side privacy — often the right choice for personal and workplace documents.