NoLogPDF

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61 browser tools Works on mobile Free to use

No File Logs

We do not upload, store, or track the files you process.

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All processing happens inside your browser.

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Built for trust with clear local limits.

PDF Security / Beta

Password Protect a PDF Online

Create a standard password-protected PDF with AES-256 or legacy RC4 and supported permission controls.

Quick answer

What does Protect PDF do?

Create a standard password-protected PDF with AES-256 or legacy RC4 and supported permission controls. The selected PDF and password are processed locally in this browser without being sent to a backend conversion server. NoLogPDF cannot recover a forgotten password; keep it securely outside the website.

Use Protect PDF when you need to add supported password encryption and permission flags to a PDF. Common uses include require a password before opening a shared PDF, limit supported reader actions with permission flags, create an encrypted distribution copy locally.

Input: PDF and password
Processing: In this browser
File upload: No
Price: Free

Designed around the task

Why use Protect PDF?

Focused controls, local processing, and clear limits help you finish the job without sending the document to a conversion server.

Focused results

Encrypts the PDF with the selected mode and open password.

Useful browser controls

Writes supported printing, copying, editing, and annotation permission flags.

Desktop and mobile

Use Protect PDF in a current desktop or mobile browser without installing a separate app.

Simple local workflow

Create an output you can inspect before sharing.

Private by design

The selected PDF and password are processed by JavaScript running in this browser for Protect PDF. NoLogPDF does not send them to a backend conversion API, and file names, contents, form values, passwords, and output data are excluded from site analytics.

Automatic file recognition

NoLogPDF checks the selected file in your browser and shows the controls available for Protect PDF.

How to use Protect PDF

Choose a PDF file.
Enter and confirm an open password, plus an optional owner password.
Choose AES-256 or legacy RC4 and set permission checkboxes.
Create, download, and test the protected PDF in a compatible reader.

What Protect PDF changes

Encrypts the PDF with the selected mode and open password.
Writes supported printing, copying, editing, and annotation permission flags.

Browser-only privacy

Limits to know before using Protect PDF

NoLogPDF cannot recover a forgotten password; keep it securely outside the website.
Reader support and enforcement of permission flags vary, and legacy RC4 is weaker than AES-256.

Common uses for Protect PDF

Require a password before opening a shared PDF.
Limit supported reader actions with permission flags.
Create an encrypted distribution copy locally.

Next step: Continue this workflow with Unlock PDF.

Protect PDF questions

How does Protect PDF work?

Create a standard password-protected PDF with AES-256 or legacy RC4 and supported permission controls. Choose a PDF file. Enter and confirm an open password, plus an optional owner password. Choose AES-256 or legacy RC4 and set permission checkboxes.

Does Protect PDF upload my PDF and password?

No. The selected PDF and password are read by code running in this browser for this operation. NoLogPDF does not send them to a backend conversion API or include document data in analytics.

What does Protect PDF change in the output?

Encrypts the PDF with the selected mode and open password. Writes supported printing, copying, editing, and annotation permission flags.

What limits should I know before using Protect PDF?

NoLogPDF cannot recover a forgotten password; keep it securely outside the website. Reader support and enforcement of permission flags vary, and legacy RC4 is weaker than AES-256.

Published and maintained by NoLogPDF

How this tool page is checked

The instructions describe this browser implementation, its expected output, and its known limits. Core workflows are exercised with local fixtures, output files are validated where the format allows, and mobile behavior is checked at a narrow viewport.