Protect PDF with Password
or drop files here · Max 60MB per file
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Add a password to your PDF with AES-256 encryption to prevent unauthorized people from opening it. Ideal for contracts, invoices and confidential documents.
- Free, no registration required
- Works directly in your browser — nothing to install
- Files automatically deleted after 1 hour
- Secure connection (HTTPS) from start to finish
Protect PDF with a password: AES-256 encryption
Contracts, bills, financial reports and personal documents should not circulate unprotected. Protecting a PDF with a password means only people who know it can open the file. The tool uses AES-256 encryption, a widely adopted standard for protecting documents.
Just enter the password, process and download the new protected file.
Specifications
- Accepted files
- Result
- PDF encrypted with an opening password
- Multiple files
- Yes, in batches (result in a ZIP when there is more than one)
- Maximum size
- 60 MB per file on the free plan; 100 MB on Premium
- Processing
- On ConverteJá servers, over an encrypted connection (HTTPS)
- Privacy
- Uploaded and generated files are deleted automatically after 1 hour
- Free plan
- 10 conversions per day, no sign-up and no watermark
- Compatibility
- Windows, macOS, Linux, Android and iOS, in any modern browser
How to use it, step by step
Upload the PDF
Upload the PDF you want to protect.
Set the password
Type the password that will be required to open the document.
Process
Click to apply the protection.
Download and share
Download the protected PDF and send the password to the recipient through a separate channel.
When to use this tool
- Sending confidential documents by email or messaging apps.
- Protecting statements, tax returns and personal documents stored in the cloud.
- Restricting access to business proposals and contracts.
- Keeping copies of important documents on USB drives and external disks.
Tips for a good result
- Use long passwords with letters, numbers and symbols, and avoid birth dates or simple sequences.
- Never send the password in the same email or chat as the file. Use a different channel.
- Store the password in a password manager. Without it, the PDF cannot be opened later.
Frequently asked questions
If I forget the password, can it be recovered?
No. ConverteJá does not crack passwords, and a file encrypted with AES-256 cannot be opened without it. Keep the password safe.
How do I remove the protection later?
Use the Unlock PDF tool, entering the current password.
What changes in the original file?
Nothing. You download a new protected file and the original stays intact.
What are the limits of the free plan?
The free plan allows 10 conversions per day, with files up to 60 MB and no sign-up required. The Premium plan removes the daily limit and the ads.