Password-Protect a PDF (AES-256 encryption)
Add a password to open a PDF and encrypt it with AES-256 (or AES-128), optionally restricting printing and copying. The result is checked with a separate PDF reader, all inside your browser.
- Runs in your browser (no upload)
Up to 150 MB per file
How to use
- Choose or drag and drop the PDF to protect.
- Enter the password to open twice. If needed, also set printing/copying restrictions and a permissions password.
- Press "Protect with password", review the checks and download the file.
FAQ
What if I forget the password?
Nobody will be able to open the file. This tool does not store passwords and cannot recover them, so keep a copy.
Are the printing and copying restrictions guaranteed?
No. They are a request to PDF readers; software that ignores them, or anyone who knows the open password, can remove them. The password to open is what protects the contents.
Is the file really encrypted?
Yes, with AES using the standard security handler of ISO 32000. Before you can download it, the file is checked with a different PDF reader (pdf.js) than the one that encrypted it: it must not open without the password and must open with the right one.
When should I use AES-128?
Only when the recipient's PDF software cannot open AES-256 files. AES-256 is fine in most cases.
Notes & limitations
- What you enter is processed only on this page and is not sent to YUCTS servers.
- PDFs that already have a password are not supported; remove the password first.
- PDF/A (archival) files cannot be encrypted under the PDF/A standard.
- Passwords may contain only ASCII letters, digits, symbols and spaces, for compatibility with readers' password prompts.
- Encrypting a digitally signed PDF invalidates its signatures.
- The strength rating estimates how guessable a password is; it is not a security guarantee.
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