Ajouter un mot de passe à votre PDF
This tool lets you encrypt a PDF file with a password directly in your browser. Set an owner password, a user (open) password, or both, then download the protected file in seconds. Works with any PDF, any size, no account required.
Your files never leave your device. Everything runs locally using JavaScript: no upload to any server, no third party ever sees your document. Free to use, no watermark added, no file size limit tied to a subscription.
Common situations include sending a contract or NDA by email and wanting only the recipient to open it, sharing a payslip or tax document with an accountant without exposing it to anyone who might access the email thread, distributing a report internally so external recipients cannot open it, and protecting a personal portfolio or CV that contains your address or ID details before uploading it to a job portal.
Yes. Because the tool runs entirely in your browser with no server communication, protecting a sensitive document here is significantly safer than using an online service that uploads your file. The encryption is applied locally and the output file is downloaded straight to your device. No copy of your document is retained anywhere.
A user password (also called the open password) is required to open and view the document at all. An owner password controls permissions, it restricts whether the reader can print, copy text, or modify the PDF. You can set one or both. If you only want to prevent unauthorized opening, a user password is enough. If you want to allow viewing but restrict editing or printing, use an owner password without a user password.
Choose AES-256 for any document you're creating or sharing in 2026. It is supported by all current PDF readers including Adobe Acrobat, macOS Preview, Foxit, and browser-based PDF viewers. RC4-128 is an older standard kept for compatibility with legacy readers (Acrobat 5 and earlier). If you have no reason to use an older reader, AES-256 is the right choice.
Yes. Open the password-protected PDF using our "Unlock PDF" tool (you'll need to enter the current password first), then re-protect it with a new password using this tool, or leave it unencrypted. This works for any PDF you've encrypted here or elsewhere, as long as you know the current password.
A user password prevents anyone from opening the file without the password. If you also want to restrict printing or copying after the file is opened, you need to set an owner password and configure the permissions accordingly. Keep in mind that permission restrictions are enforced by the PDF reader and can be bypassed by sufficiently motivated users with the right tools, they are a usage policy layer, not a full technical barrier. For truly sensitive content, encryption combined with access controls on the distribution channel gives the strongest protection.