Mã Hóa Và Bảo Mật Tệp PDF Trực Tuyến - Sejda

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Bảo vệ tệp bằng mật khẩu và quyền truy cập

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  • Địa chỉ web (URL)
  • Recent files
or start with a blank document

Các tệp được giữ chế độ riêng tư. Tự động xóa sau 2 giờ. Miễn phí dịch vụ cho các tài liệu lên đến 200 trang hoặc 50 MB and 3 tasks per hour.

Terms of Use and Privacy Policy Offline Cần làm việc ngoại tuyến? Thử Sejda phiên bản Desktop

Password for file.pdf

Incorrect password Use this password for all files Tiếp tục This document has limited permissions. Provide the owner password to enable modifying its contents. Learn more. Enter password

Owner password for file.pdf

This document has limited permissions: Content copying Editing contents Organizing pages Fill forms In ấn Signing Incorrect password Provide the document owner password to enable all permissions: Learn more Tiếp tục

Paste the web address of the file:

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Could not upload your file: . You won't be able to save changes until the upload is successful.

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File Task
sample.pdf Edit
Tự động xóa sau 2 giờ. Close 0% Đang tải, vui lòng chờ... Sort by
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Selected files (drag to reorder) Close Cách đặt mật khẩu bảo mật cho tệp PDF

Below we show how to encrypt a PDF file with a password and how to apply PDF restrictions.

  1. Tải lên tệp của bạn

    Tệp được tải lên an toàn qua kết nối được mã hóa. Tệp luôn được bảo mật. Sau khi xử lý, chúng sẽ bị xóa vĩnh viễn.

    Bạn không muốn tải tệp lên và muốn xử lý ngoại tuyến? Try Sejda Desktop. Các tính năng tương tự như dịch vụ trực tuyến và các tệp không bao giờ rời khỏi máy tính của bạn.

    Nhấp vào 'Tải lên' và chọn tệp từ máy tính của bạn.

    Bạn có thể kéo và thả tệp vào trang.

    Tệp trên Dropbox hoặc Google Drive

    Bạn cũng có thể chọn tệp PDF từ Dropbox hoặc Google Drive.

    Mở rộng menu 'Tải lên' và chọn tệp của bạn.

  2. Choose a strong password

    When opening the document, users will be asked to provide this password. Make sure it's a strong password, recommended 16 characters or more.

    Optionally, choose an owner password as well

    This is the password that users will be asked when attempting to make changes to the document, after the document is already opened.

  3. Select optional PDF restrictions

    Choose what PDF features should be allowed. For example printing can be restricted, or filling forms and commenting can be disabled

    Depending on the software used for opening the PDF file, these permissions may or may not be enforced.

  4. Save your changes

    Click Encrypt PDF and then Download your protected PDF.

Ready to password protect your PDF?

Password protect PDF Mật khẩu Admin password to change permissions Mã hóa Vừa (RC4 128 bits) Vừa (AES 128 bits) Mạnh (AES 256 bits) Allowed PDF reader permissions Chỉnh sửa Sao chép văn bản và hình ảnh In ấn In ấn độ phân giải cao Điền biểu mẫu Nhận xét Chèn, xoay hoặc xóa trang

Warning: Some PDF readers will ignore these permissions. Permissions may not be honoured or enforced at all times.

Mã hóa tệp PDF Tùy chọn khác Liên Hệ Hỗ Trợ

Contact SEJDA.COM support

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Scanned documents are not supported

Editing scanned documents is not supported. Changing existing text within scanned documents is not supported. However, you can still use other features such as adding new text, images, and annotations. Converting scanned documents is not supported. Scanned PDFs are images of text and lack the actual text data needed for conversion. File: Don't show anymore Learn more Move page to a new location New page location: Tip: Can also drag and drop the page to the new location Move page Select language
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