Docu StopProtect PDF
Add password protection to PDF
Choose a file or drag it here
Up to 4.5 MB per requestAdd password protection to your PDFs
Secure your PDF documents with strong password encryption. Only people with the password will be able to open and view the file. This is essential for protecting sensitive business documents, personal records, financial statements, and confidential reports before sharing them via email or cloud storage. The encryption is applied using industry-standard PDF security, and you can remove the password later using the Unlock tool with the same password.
Frequently asked questions
How strong is the password encryption?
We use industry-standard PDF encryption. The PDF cannot be opened without the password you set.
Can I remove the password later?
Yes — use the Unlock PDF tool with the same password to remove protection whenever you need.
Do I need an account to protect a PDF?
No — the tool is free and works without sign-up for your first use.
Is this tool free?
Yes, all Docu Stop web tools are completely free to use with no hidden charges or credit card required.
Are my files private and secure?
Absolutely. Files are processed over encrypted connections and automatically deleted from our servers after processing. We never access, store, or share your documents.
What is the file size limit?
Uploads are limited to approximately 4.5 MB per request due to server constraints. For larger files, download the Docu Stop mobile app which supports documents of any size.