Sometimes a PDF needs a lock: a contract, an invoice, a personal record you are sending or archiving. PDF Arranger can open password-protected PDFs and can encrypt the files it exports, using the Set Password step during export. This guide covers both directions — protecting a file, and honestly, what the protection does and does not do.
One boundary up front: PDF Arranger works with passwords you know. It opens a protected PDF after you enter its password, and it protects files with a password you choose. It is not a password cracker — a PDF whose password you do not know stays closed, and nothing here bypasses a document’s restrictions.
Before you start
You need PDF Arranger 1.14.0 (or a recent version) installed. If it is not on your computer yet, download PDF Arranger first — it is free, open source (GPL-3.0), and works entirely offline, so your files never leave your computer.
Nothing you do in PDF Arranger changes the original file on disk. Every edit only takes effect when you export the result to a new PDF, which makes experimenting safe: if the output is not what you wanted, adjust the arrangement and export again.
Step by step: export a password-protected PDF
- Open the PDF in PDF Arranger and make any page changes you need first — protection is applied at export, as the final step.
- Start the Export. During export, open the Set Password dialog when prompted by the export options.
- Enter the password you want the file to require, and confirm it carefully — there is no recovery if you mistype and forget it.
- Finish the export. The exported PDF is encrypted (PDF encryption revision R=6, the modern AES-256-level scheme). Anyone opening it must enter the password first.
- Test the exported file by opening it fresh and entering the password, before you delete or send anything.
How the password works in PDF Arranger
PDF Arranger keeps this simple: the password you set is used as both the user password and the owner password — there is one password, not two. Correspondingly, the app does not offer the fine-grained permission switches some editors have: you cannot set a separate password for opening versus printing, or allow opening but forbid copying, from this dialog. If you need per-permission control, that is a job for a full PDF editor; if you need “only people with the password can open this file”, Set Password does exactly that.
Saving a copy without a password
The reverse is straightforward and legitimate for your own files: open the protected PDF and enter its password when asked. Then export without setting a password in the Set Password step. The exported copy opens freely, while the original stays protected. This only works because you knew the password to open the file in the first place — it is re-saving your own document, not removing protection you are not entitled to.
Tips
- Store the password somewhere safe (a password manager) before sharing the file; PDF Arranger cannot retrieve it for you later.
- Send the password separately from the file — a different message or channel — or the protection adds little.
- Protect the final version only. Re-exporting after every small edit means re-entering passwords and risks version mix-ups.
Choosing a password worth using
The protection is only as strong as the password behind it. Use a long, unique password — a phrase you do not reuse elsewhere — rather than a name, a date, or the document’s subject, all of which are guessable by anyone who knows what the file contains. A password manager can generate and store one for you, which also solves the delivery problem: you can retrieve it later when a recipient legitimately needs it re-sent. Finally, remember that an encrypted PDF still needs careful handling in transit; the password stops casual opening, and pairing it with sensible sharing — the right recipient, a separate channel for the password — is what makes the protection meaningful in practice.
Related guides
Keep going with these step-by-step guides from the same series: