Browser-Local · No PDF Upload

Password Protect a PDF

AES-256 encryption that happens in this browser tab — set an open password, choose reader permissions, and download a copy you test before sending.

Selected PDF Content Stays Local|Time Varies by File and Device

Drop the PDF you want to password-protect

Encrypted with AES-256 inside this browser tab — the file and the password never leave your device

How to Password Protect a PDF in 3 Easy Steps

Browser-local document processing with no application installation required.

Drop the PDF

Signed and already-protected files are flagged immediately rather than silently damaged.

Choose the Password & Permissions

Set the open password; optionally add an owner password and pick allowed reader actions.

Download & Test the Copy

Open the protected copy: it must ask for the password, and open with the one you set.

Why Use Our Password Protect a PDF Tool?

Current capabilities and limitations, described without universal quality or speed promises.

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AES-256 Encryption

The strongest standard PDF cipher (ISO 32000-2's recommendation) — not the obsolete RC4 some tools still use.

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Reader Permissions

Decide what a reader without the owner password may do: print, copy text, edit content, comment and fill forms.

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Password Never Sent

You type the password once, into this page. It is used in memory and never transmitted — there is no server to receive it.

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Signed Files Refused

Encrypting rewrites the file, which would break an existing digital signature — those files are detected and left alone.

Frequently Asked Questions

Get clear answers about data flow, formatting, integrity, and usage limits.

How do I password protect a PDF without uploading it?

This page. The PDF is encrypted with AES-256 inside your browser using a WebAssembly-capable PDF library — the file and the password never touch a server. Download the protected copy and test it before sending.

What is the difference between the open password and the owner password?

The open password (user password) is required to open the file at all. The owner password unlocks full access and permission changes — readers who only have the open password are limited to the permissions you selected. If you skip the owner password, it defaults to the open password.

Can the PDF password be removed or cracked?

AES-256 with a strong password is not realistically crackable by brute force — the weak link is the password itself. Use a long, unique passphrase. Permission flags (like 'no copying') are honoured by mainstream readers but are advisory, not cryptographic; the open password is the real lock.

What if I forget the password?

There is no recovery. Keep the unprotected original in a safe place and treat the protected copy as the one you distribute. The tool warns about this for a reason.

Will the protected file work in Adobe Reader, Preview and on phones?

AES-256 is part of the PDF standard (PDF 2.0's recommended cipher, supported since Acrobat 9) and works in current versions of Adobe Reader, macOS Preview, Chrome, Edge, Firefox and mobile viewers.

Can I protect several PDFs at once?

Protect them one at a time here — each gets its own password immediately, and nothing is queued on a server. For a batch of files that share one password, repeat per file; the file stays local each time.

Our Core PDF Tools

Browser-local compress, merge, rotate, rename, inspect, protect and OCR — nothing is uploaded.

📉Compress PDF

Recompress embedded PDF images locally; results and image quality vary

📑Merge PDF

Combine multiple PDFs into a single file, with folder import and auto ordering

🎯Compress to a Target Size

Hit a size limit — 2MB visa, 500KB forms, 25MB Gmail — or get the honest closest result

🔄Rotate PDF

Turn one PDF or a whole batch and save permanent rotated copies

🏷️Rename PDFs in Bulk

Pattern-based batch renaming with a live preview and ZIP download

🧹Remove Metadata

See and scrub hidden author, app and timestamp data before sharing

📋Check Before Sending

Pre-send checklist: size limits, metadata, personal data, page order, redaction risks

🔐Password Protect

AES-256 encryption in your browser with reader permissions — no upload

🖍️Redact Text

True redaction that destroys the text — then verifies it's gone

📇OCR a Scan

Make scans searchable with a local engine — pages never leave the device

🔍Compare Versions

Line-level diff between two drafts, computed locally

🏗️Secure Cleanup

Rebuild pages-only: metadata, attachments, scripts and history dropped

✍️Sign a PDF

Real PKCS#7 digital signatures computed on your device — import a certificate or create one

📄Word to PDF

Convert .docx to a searchable PDF locally — headings, lists and tables reproduced

🗂️Excel to PDF

Print every sheet as a clean grid, locally — dates as dates, no silent cut-offs

🤝Team Workspace

Share activity, not documents — one code puts a feed and notes in front of the team