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Password-encrypt PDFs with AES and set granular permissions.
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Among ToolsMonk's pdf tools, Lock & Protect PDF covers a single everyday need: password-encrypt pdfs with aes and set granular permissions. Open the page and start working, with no download or sign-up standing between you and the result.
This tool is especially useful for workflows such as password-protecting a confidential document before emailing it, securing sensitive files like statements, contracts, or records, and adding access control before sharing a pdf. Because it runs directly in your browser, you can use it on desktop, tablet, or mobile while keeping the process fast and easy for one-off tasks as well as repeat work.
Everything about Lock & Protect PDF is tuned for speed to first result, with privacy-friendly processing and the rest of ToolsMonk's tools nearby when the next task comes up.
| Price | Free, no signup, no paywall, no watermark |
|---|---|
| Works on | Any modern browser: desktop, tablet, and mobile |
| Processing | In your browser, files never leave your device |
| Account required | None |
| Category | PDF Tools |
Upload the PDF you want to protect
Set a password
Apply encryption in your browser
Download the password-protected PDF
Adds password protection to a PDF so only authorised people can open it
Applies real PDF encryption
Runs in your browser, your document is never uploaded
Keeps your file's content and layout intact
A clean, secured output workflow
Free, watermark-free, with no limit
Password-protecting a confidential document before emailing it
Securing sensitive files like statements, contracts, or records
Adding access control before sharing a PDF
Protecting personal documents in storage
Lock & Protect PDF was built so that anyone, professional or first-time visitor, gets what the page promises (password-encrypt pdfs with aes and set granular permissions) in seconds. Results are instant and accurate, and nothing needs to be installed or signed up for along the way.
As part of our PDF Tools collection, this tool is designed with simplicity and power in mind. All processing runs locally in your browser, so your files and data never leave your device. The tool works seamlessly across all modern browsers on desktop, tablet, and mobile devices.
Protect PDF secures a PDF with a password using real encryption, so only people with the password can open it, the straightforward way to keep a confidential document private before sharing or storing it.
Because it's genuine encryption, the protection is meaningful, and its strength comes down to your password: a long, unique one is far harder to crack than something short or common. Critically for a security tool, the encryption is applied entirely in your browser, so your sensitive file is never uploaded, uploading a document just to protect it would undermine the whole point.
The flip side of real encryption is that there's no backdoor: lose the password and the file can't be opened. So store it safely and always keep an unprotected master copy before you protect and distribute. And remember protection governs access, not what an authorised holder does next, only share the password with people you trust.
For finer control, restricting printing, editing, or copying alongside the open password, use Lock PDF; to reopen a protected file you have the password for, use Unlock PDF. Everything runs in your browser with no watermark or limit.
Use a long, unique password and store it in a password manager, there's no recovery if lost
Keep an unprotected master copy before protecting and sharing
Need to restrict printing/copying too? Use Lock PDF for granular permissions
Common questions about this tool, its workflow, and what to expect before you use it.
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Watermarks protect your intellectual property, mark documents as confidential, and reinforce your brand. Learn how to add text and image watermarks to PDFs, including 'DRAFT,' 'CONFIDENTIAL,' and custom logo watermarks, for free.
Read the guide 5 min readSensitive PDFs need more than just a password. Learn about PDF encryption levels, permission controls, digital signatures, and redaction, a complete guide to securing your documents against unauthorized access and modification.
Read the guide 7 min readFree online PDF editor: edit existing text, highlight and mark up, fill forms, sign, redact, organize pages, and export to PDF, Word, Excel, or image.
Try itCheck a PDF for tags, alt text, headings, table headers, and language against WCAG criteria.
Try itReduce PDF file size without losing quality.
Try itCombine multiple PDF files into one document, with an optional compress & merge mode.
Try itExtract pages from a PDF into separate files.
Try itConvert PDF pages to JPG, PNG, or WebP images with adjustable DPI.
Try itConvert PDF to an editable Word (DOCX) document with paragraphs, headings, lists and real tables preserved, entirely in your browser.
Try itConvert a PDF into a real, openable .pptx that looks identical to the original with fully editable text, plus exact-image and clean text-only modes. One slide per page, in your browser.
Try itWriting a roundup or tutorial? Embed the live Lock & Protect PDF so readers use it right on your page, or drop in a ready-made card that links to it. Free to use, always.
Preview
Password-encrypt PDFs with AES and set granular permissions.
Use Lock & Protect PDF free →Live tool (iframe)
Readers use the real, working tool right on your page, with a small credit line underneath.
Embed card (HTML)