Protect PDF with Password — Free Online Encryption
Processed on our servers — auto-deleted within 1 hour, never used for anything else.
Sending a contract, invoice, or medical document by email? Add a password so only the intended recipient can open it. Upload the PDF, choose a password, and our servers apply real AES-256 encryption — the same standard banks use. The password is used once here and never stored. Delete your file right after processing, or let it auto-delete within 1 hour.
How it works
- 1
Add your PDF
Drop one file or up to ten into the box, or click to browse. Files up to 95 MB each.
- 2
Choose a password
Pick something the recipients can type but others cannot guess. It is applied once and never stored.
- 3
Download the protected PDF
The copy opens only with the password — share the password over a different channel than the file.
About this tool
Adding a password to a PDF
Upload a PDF, choose a password, and our servers apply real AES-256 encryption — the same standard banks use. From then on, only someone holding the password can open the file, on any device, in any reader.
Choosing a password worth the encryption
The encryption is strong; the password is the weak point. A short or guessable password turns strong encryption into strong theater — use length and randomness, and share the password through a different channel than the file itself.
What the protection covers — and does not
The password gates opening the file. It does not stop a recipient who opened it from sharing the unlocked content — protection controls access, not behavior downstream. The password is used once and never stored; your file auto-deletes within 1 hour.
Frequently asked questions
Which encryption is applied?
AES-256 — the strongest standard symmetric encryption, the same class banks and governments rely on.
Can I recover a password I forget?
No — there is no backdoor. The password is the only way in, which is why it should be long, random, and recorded somewhere safe before you send the file.
Is my document private?
It is processed on our servers, and the password is used once and never stored. Delete the file with one click right after processing, or let it auto-delete within 1 hour.