DocomintProtéger un PDF par mot de passe
Ajoutez un mot de passe à un PDF (AES-128) pour qu'il ne puisse pas être ouvert sans lui, entièrement dans votre navigateur.
Drop your PDF here
or choose a file from your device
What is a Protéger un PDF par mot de passe?
Password-protecting a PDF is the standard way to keep a document readable only by its intended recipient in transit — tax documents, contracts, or medical records sent by email, where anyone who intercepts the message shouldn't be able to open the file without a password shared separately.
How to use the Protéger un PDF par mot de passe
- Add a PDF file
- Set a password
- Download the password-protected PDF
Example
Protecting a PDF with the password "Q7#mx2Lp" and sending that password in a separate text message rather than the same email means the file stays unreadable to anyone who only gets the attachment.
Why use Protéger un PDF par mot de passe
Real AES-128 encryption
The same standard security handler Adobe Acrobat and every major PDF reader recognize — not a proprietary lock.
Nothing uploaded
Your PDF is encrypted locally in this browser via the Web Crypto API; the file and the password you set never leave your device.
One password, full protection
The password required to open the file also governs the whole document — no confusing split between an owner and a user password.
What can you create?
Email a sensitive document
Password-protect a tax form or medical record before attaching it, then share the password through a separate channel.
Restrict a file before archiving
Lock a contract or financial record before it goes into shared or long-term storage.
Add a layer before handing off a device
Protect a personal PDF before it's stored somewhere other people can reach the file itself.
Frequently asked questions
Is my PDF uploaded anywhere?
No — Protéger un PDF par mot de passe runs entirely in your browser using JavaScript/WebAssembly. Your PDF is never sent to a server.
Is there a file size limit?
Free use covers files up to 100MB per file; signing up for Pro raises that to 500MB.
What encryption does the password protection actually use?
AES-128 (revision 4), a widely supported standard recognized by Adobe Acrobat and most other PDF readers — not a proprietary or weaker scheme.
Can I let people view the PDF without a password but block printing or editing?
No — this sets a single open password required to view the file at all. Separate owner-permission passwords that leave viewing open while restricting printing or editing aren't currently supported.
What happens if I forget the password I just set?
There's no recovery — write it down somewhere safe before you close the tab, because a forgotten password on a protected PDF can't be recovered by this tool or anyone else without brute-forcing it.