Duronto Tech - Free Online Tools
PDF Tools

PDF Password Protection

Add password protection to your PDF files.

.pdf Max: 50 MB

Click to upload or drag and drop

Supported: PDF

How to Use PDF Password Protection

1

Upload the PDF you want to secure, using drag-and-drop or the file browser; documents up to 50 MB are accepted.

2

Type the password you want to require, and confirm it in the second field so the two entries match exactly.

3

Adjust the permissions, such as allowing printing and copying but blocking edits, then click the "Protect PDF" button.

4

Download the encrypted file, open it to confirm the password prompt appears, and send the password to the recipient separately.

Features

Adds a standard open password that works in any PDF reader
Optional permissions to allow printing while blocking editing
Encryption applied in your browser with no software to install
Free to use with no sign-up, watermarks or file count limits
Accepts documents up to 50 MB
Uploaded files are deleted automatically after processing

Frequently Asked Questions

Yes, as long as they have the correct password. It uses the same encryption built into Adobe Reader, Preview and the mobile PDF apps people already use.
The password cannot be recovered. You would need to create the protected file again from an unprotected copy, so keep a password manager entry or a note for anything important.
The document is handled in a temporary session and deleted automatically once the encrypted copy is ready. Always keep your own backup of the original regardless.
Yes. In addition to the open password you can allow viewing and printing while blocking editing and copying, which suits contracts that are meant to be read only.

Related Tools

JPG to PDF

Convert JPG images to PDF documents online.

PNG to PDF

Convert PNG images to PDF format online.

Images to PDF

Combine multiple images into a single PDF document.

PDF to JPG

Convert PDF pages to JPG images.

PDF to PNG

Convert PDF pages to PNG images.

PDF Compressor

Compress PDF files to reduce file size.

About PDF Password Protection

Before emailing tax returns, medical summaries, payslips or signed agreements, it is worth deciding who can actually open the attachment. This tool adds standard PDF encryption with a password you choose, so the document stays readable on any device but is useless to anyone who does not have the key.

Two levels are worth understanding. An open password is required just to view the file, which is what most people mean by password protecting a PDF. Permissions are the second, subtler layer: you can allow printing and copying while blocking edits, which is handy for a document that recipients need to read and sign but must not alter. Choose whichever matches what you are sending.

Pick a password you can actually remember and send it through a different channel than the file, ideally a phone call or a separate message. Passwords cannot be recovered by this tool or anyone else, so a forgotten one means regenerating the document from your source file. Files up to 50 MB are supported.

When to Use This Tool

  • Sending payslips, tax returns or medical records without leaving them open to anyone who intercepts the email
  • Locking a draft contract so a distributor cannot view it before launch
  • Allowing a client to print a statement while stopping them editing the figures
  • Protecting exam papers or internal drafts before circulating them internally