php editor Baicao teaches you how to add an "open password" to PDF files to protect file security. By using Adobe Acrobat software, you can easily set a password for a PDF file so that the file can only be opened by entering the correct password. This function is very practical and protects the privacy of files and prevents unauthorized persons from viewing the file contents. Let's learn how to add an "open password" to PDF files to ensure that the file information is safe and reliable.
Tool 1: PDF Editor
Normally, PDF readers do not support password protection. If you need to set a password, it is recommended to use a special PDF editor to achieve it. Just choose a suitable PDF editor and install it.
After installation, open the PDF file through the editor, then find the [Protection] tab in the menu list, and click [Password Encryption] in the tab list;
After the [Password Encryption] dialog box pops up, enter the password you want to set twice in the blank field, and then click [OK]. The "Open Password" of the PDF file will be set.
If you no longer need password protection, click the [Protection] tab in the menu list, and then find [Delete Security Settings];
After a dialog box pops up prompting "Are you sure you want to delete the security settings in the document?", click [OK], and the "Open Password" of the PDF will be deleted.
Tool 2: Multifunctional PDF Tool
Using the multi-functional PDF tool, you can also set an "open password" for PDF. Take Pepsi Niu PDF Password Recovery Tool as an example. The "Add Open Password" in the tool has this function.
Tool link: Pepsi Niu PDF Password Recovery Tool
After selecting the [Add Open Password] module, import the PDF file that requires adding a password into the tool interface, and then click [Start];
After going to the next interface, enter the password you want to set in the password field, click [OK], and the "open password" of the PDF file will be set.
If password protection is no longer needed, you can also use tools to delete it.
In the initial interface of the tool, the [Remove Password] module is used to delete the "open password" of PDF files.
After selecting the [Remove Password] module, import the PDF file whose password needs to be deleted, then enter the originally set password in the password field, and click [Confirm] to delete it.
The PDF file with the "open password" deleted will be saved as a new file, and the original file will still exist. Click [Open Folder] on the tool page to find the PDF file with the password removed.
It should be reminded that the above two methods of removing "open password" are removed when the password is remembered but no longer needed to be protected.
If you forget your password, you cannot use the above method. Because the first method requires opening the PDF file with a password before deleting it; the second method also requires entering the original password before deleting it.
If you forget your password, you cannot open the PDF file using the PDF editor, nor can you delete the password. In this case, it is recommended to choose the second tool: Pepsi Niu PDF Password Recovery Tool, although it cannot be deleted directly in the tool. "Open Password", but the [Retrieve Password] module can help us retrieve the "Open Password" of PDF.
Tool link: Pepsi Niu PDF Password Recovery Tool
The above is the detailed content of How to add 'open password' to PDF files?. For more information, please follow other related articles on the PHP Chinese website!

This tutorial explores three distinct methods for creating histograms in Excel: leveraging the Analysis ToolPak's Histogram tool, employing the FREQUENCY or COUNTIFS functions, and utilizing PivotCharts. While creating basic charts in Excel is strai

This comprehensive guide provides step-by-step instructions for creating and managing professional email signatures in Microsoft Outlook. Learn how to craft compelling signatures with images, clickable links, and more, across all Outlook versions (i

This tutorial demonstrates how to calculate sums in Excel using the AutoSum feature and custom SUM formulas for columns, rows, and selected ranges. It also covers summing only visible cells, calculating running totals, summing across multiple sheets

This concise guide explains Excel's AutoSum feature and its efficient uses. Learn to quickly sum columns, rows, or visible cells, and troubleshoot common AutoSum issues. Excel's SUM function is incredibly popular, prompting Microsoft to include a ded

This article introduces the Excel SWITCH function, explaining its syntax and demonstrating its use in simplifying complex nested IF statements. If you've struggled with lengthy nested IF formulas, the SWITCH function offers a significant time-saving

This concise guide demonstrates how to efficiently calculate running totals (cumulative sums) in Excel using a SUM formula with strategically placed absolute and relative cell references. A running total displays the accumulated sum of a dataset as

Are you looking for an Excel formula to count characters in a cell? If so, then you have certainly landed up on the right page. This short tutorial will teach you how you can use the LEN function to count characters in Excel, with or with

This tutorial demonstrates how to count words in Excel using a combination of the LEN, SUBSTITUTE, and TRIM functions. It offers both case-sensitive and case-insensitive formulas for counting total words or specific words/text within a cell or range


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

SublimeText3 English version
Recommended: Win version, supports code prompts!

mPDF
mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),

SublimeText3 Mac version
God-level code editing software (SublimeText3)

MinGW - Minimalist GNU for Windows
This project is in the process of being migrated to osdn.net/projects/mingw, you can continue to follow us there. MinGW: A native Windows port of the GNU Compiler Collection (GCC), freely distributable import libraries and header files for building native Windows applications; includes extensions to the MSVC runtime to support C99 functionality. All MinGW software can run on 64-bit Windows platforms.

Atom editor mac version download
The most popular open source editor