Lock a PDF with a password using strong AES-256 encryption. You can also stop others from printing, copying or editing it.
Free · no sign-up · no watermark
Choose the document to protect.
Optionally restrict printing, copying and editing.
Only people with the password can open it.
Free without an account: 3 tasks a day (6 with a free account), files up to 20 MB.
PDFTEK uses AES-256, the strongest encryption in the PDF standard. Choose a long password: it can't be recovered if you forget it.
Yes, with the Unlock PDF tool, as long as you know the password.
Yes. Free without an account: 3 tasks a day (6 with a free account), files up to 20 MB. No watermark is added. If you need more, a Day Pass is $1.99 for 24 hours and Pro is $5.99/month.
Files are sent over HTTPS and stored in your private workspace, never shared or used to train AI. Files from sessions without an account are deleted automatically after 24 hours, and you can delete any file yourself at any time.