PDFDOK

Protect PDF

Protect PDF files with a password. Encrypt PDF documents to prevent unauthorized access.

Max 50 MB per file

files selected

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Secure

Temporary file storage

Fast

Results in seconds

Quality

Professional output

About this tool

Protect PDF

Add a password to a PDF so that opening the protected document requires it. Choose a strong password and share it with the recipient through a separate channel. Keep a safe copy of the password; protecting the document does not provide a password-recovery service.

Works with PDF

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Do you need to convert more file types?

Try a related tool or discover another way to work with your files.

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Frequently Asked Questions

Yes. Files are transferred over secure connections and processed as temporary working files rather than permanent public uploads.
You can upload supported PDFs, images, Word documents, Excel spreadsheets, and PowerPoint files. The homepage then shows only the enabled tools that match that upload.
Many tools can be used right away without creating an account. Depending on the service, higher limits, premium workflows, or subscription features may require login or billing.
Yes. PDF uploads can unlock conversion tools like PDF to Word along with workflows such as merge, split, compress, and export to image or text formats.
Yes. The platform is designed to work smoothly in modern desktop and mobile browsers, so you can upload, convert, and download files from the device that suits you best.
Many core tools are available without registration, while advanced or high-volume usage may depend on your billing setup or subscription.
Converted files are kept only for a limited time. The platform is designed around temporary secure processing rather than long-term storage of your uploads.
Yes, for tools that support batches. The available choices depend on the limits and file-count rules of each enabled service.
That is the goal of every conversion flow. Results depend on the source document quality, but the platform is designed to preserve layout, structure, and readability as closely as possible.
That usually means the tool is disabled, the uploaded file type is not supported for that workflow, or the current upload exceeds that service’s limits.