PDF 보호 — 무료 온라인 도구
즉시 사용, 무료, 회원가입 불필요. 파일은 로컬에서 처리되며 업로드되지 않습니다.
By the AllFileBox Team · Last updated: 2026-07-05
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Protect PDF is a free online tool that adds password encryption to a PDF, so only people who know the password can open and read the document.
Why password protect a PDF
Contracts, statements, and personal records often need to stay confidential. Adding a password encrypts the PDF so it cannot be opened without the key, which is essential when sending sensitive files by email or storing them in shared locations.
Strong, standard encryption
The tool applies standard PDF encryption tied to the password you choose. Anyone without the password sees only an encrypted file. Choose a strong, unique password and share it through a separate channel from the document itself.
사용 방법 PDF 보호
- Open Protect PDF in your browser.
- Drop your PDF onto the upload area.
- Enter the password you want to set.
- Confirm the password.
- Download the encrypted PDF.
Secure financial files
Secure financial files
Password protect a bank statement before emailing it to your accountant.
Protect contracts
Encrypt a signed agreement so only the parties can open it.
Lock personal records
Add a password to medical or ID documents stored in the cloud.
| Step | What it does | Note |
|---|---|---|
| Set password | Encrypts the file | Choose a strong one |
| Share PDF | Stays locked | Send key separately |
| Open later | Needs password | Unlock to remove |
관련 도구
주요 기능 PDF 보호
파일은 비공개로 유지됩니다
모든 처리는 브라우저에서 이루어집니다. 파일은 서버로 전송되지 않습니다.