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Lock PDF — Why We Don't Offer It Yet

PDF encryption re-encodes the entire document with a standard cipher. It's not simply a setting that "asks when you open" — every stream in the document must be encrypted and a new dictionary of permission info constructed.

The browser PDF library ezyPDF uses supports assembling and editing documents but not encryption. Encryption faked in an unverified way isn't actually protective while making users believe they're safe, which we judged to be more dangerous — so we don't offer it.

If you need to protect a document right now, use the "set password" feature of the program that made it (Word, Acrobat, etc.), or protect the delivery path with an archive tool's password feature.

현재 이 기능은 제공하지 않습니다

작동하지 않는 기능을 작동하는 것처럼 보이게 하지 않기 위해, 파일 선택 영역을 만들지 않았습니다. 아래에 현재 상태와 필요한 기술을 정리했습니다.

PDF 잠금 설정 기능의 지원 상태와 기술 요건
현재 지원 상태미지원 (준비 중)
필요한 기술qpdf 또는 pikepdf를 실행할 수 있는 서버(컨테이너) 환경, 파일 업로드·삭제 파이프라인
구현 난이도중간
예상 서버 비용상시 컨테이너 1대 기준 월 1~2만 원대(소규모 트래픽). 트래픽에 비례해 대역폭·저장 비용 추가
외부 API 필요 여부불필요 (오픈소스로 구현 가능)
지금 쓸 수 있는 도구 보기이 기능이 필요하다고 알리기

Limits of this tool

  • The browser PDF library has no standard encryption implementation.
  • Safe encryption must be handled with a verified server-side tool (like qpdf).

How to use

  1. 1

    Check the current status

    This feature isn't available yet. That's also why there's no file upload area.

  2. 2

    Use an alternative

    Using the password-save feature of the program that created the original document is the most reliable option.

  3. 3

    Inspect the status

    To check whether a document already has a password, use the PDF Info tool.

Key features

  • No pretending it works

    Showing a feature that doesn't actually protect as "protected" gives users a false sense of safety. So we didn't build the button at all.

  • Password detection is provided

    Determining whether a document has a password does work — in the PDF Info tool.

  • Implementation plan disclosed

    What technology is needed and why a server is required are disclosed in the table below.

When to use it

  • Distributing external documents

    When an open password is needed, use the password feature of the original editing program.

  • Protecting the delivery path

    For email attachments, using a password-protected archive and sharing the password by another channel is widely used in practice.

How are your files handled?

This page doesn't accept files. There's no upload area, so no data is processed.

This page has no file picker, so no data is processed. See the Privacy Policy and File Retention Policy for details.

Tools that pair well

Lock PDF FAQ

Will it be supported someday?
We'll review it when a server-processing path is introduced. Since it conflicts with our current principle of not sending files to a server, we'll clearly mark which tools use a server if introduced.
It worked on other sites, though.
Most upload the file to a server to process it. That approach is functionally possible, but you should use it knowing your file passes through an external server.
I just want to check whether it's password-protected.
The PDF Info tool can determine whether encryption is set.