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Introduction:
The stability and consistency of PDF make it a preferable file format in file transmission. However, we may need the PDF document to be non-editable, especially when this PDF is a fillable form or contract. Considering a handful of PDF editors available, how to edit a PDF is not much of an issue now. But do you know how to make PDF non-editable?
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Users who are googling how to make PDF non-editable are growing in large numbers. In the case of important PDF documents involved, it’s urgently needed to restrict all viewers from editing them at will. But how? To help you out, in this article, we shall render you efficient methods on how to make PDF non-editable.

Why Do You Need to Make PDF Non-Editable?

In many crucial cases, the PDF file format is currently regarded a standard format. Evidently, both editable and non-editable PDFs are required in different situations. Reasons to make a PDF non-editable may stump you. In this section, we'll go through several frequent scenarios in which non-editable PDF files come in handy.

  • If it is an agreement

Agreements often come from negotiations to record commitments for both parties. They are a vital part of building relationships and preventing conflicts. Once an agreement gets intentionally changed, the collaboration will break down, and conflicts will arise consequently.

  • A notification for the recruitment

Companies trying to hire an ideal employee must ensure that the information in the job description matches the information initially submitted by HR. Once the notification is modified, the wrong messages will result in misunderstanding.

  • When the PDF contains facts and figures

For authorities or publishing platforms, their published content always contains real facts and figures for reference. If this information gets revised, untrue messages will influence readers and cause wrong recognition.

How to Make PDF Non-Editable (Read-Only)

Information leakage is a common thing nowadays. Thus, learning how to make PDF non-editable becomes an emergency more than ever. Thankfully, there are solutions to make a PDF non-editable. In the following, we listed all the workable ways to make PDFs unchanged.

#1. Password Protect Your PDF Files

The most direct and efficient way to make your PDF non-editable is to add a password to the PDF to restrict all editing. SwifDoo PDF has an encryption feature to password protect PDF files. It offers two types of passwords: opening password (for restricting the opening of a PDF file) and owner password (for setting certain restrictions, such as print, copy, annotate, and edit).

Here are details about how to make PDF non-editable by using SwifDoo PDF:

Step 1. Run SwifDoo PDF on your computer and open a PDF file;

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Step 2. Click Protect in the top navigation bar, then select Encryption;

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Step 3. Leave the Owner Password box checked, including all four permissions. Remember to enter a password within 3-15 characters;

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Step 4. Click OK to apply the setting.

By adding an owner password to the PDF file, people who receive the file can only view the content without editing. You may have noticed that SwifDoo PDF also enables you to set an opening password for PDF files, which is much stricter than the owner password because people who don’t know the password are even unable to view the PDF once added.

#2. Turn Off OCR When Editing a PDF File

Usually, an image-only PDF file can be transferred to a searchable/editable PDF by using OCR technology. So, even though the image PDF is non-editable, it can be edited easily by converting it in advance. The first and foremost step to making a PDF non-editable is to disable the use of OCR technology.

OCR (Optical Character Recognition) is the use of technology to extract text content from an image or scanned file into editable files. It helps a lot when converting images into characters. However, we need to make PDF non-editable, so we must turn off this feature.

Using OCR to extract characters from an image-only PDF is utilizing the comparison of different levels of lighting and shadows in the PDF. Normally, it will take the dark areas as characters while the light areas act as the background. Therefore, in theory, you can disable the use of the OCR feature by changing the contrast ratio. For humans, it’s possible to read a low-light or low-resolution image, but OCR technology is unable to process the content.

#3. Flatten a PDF

Have you heard about flattening PDFs? When you flatten a PDF, you combine all the contents into one layer. By doing so, interactive elements like images, fillable forms, checkboxes, etc. will be non-editable.

To flatten a PDF, you can convert PDF to image or use professional PDF editors directly. Wondershare PDFelement, for example, enables you to flatten a PDF directly. Follow the instructions to know how to flatten a PDF with minor steps:

Step 1. Download Wondershare PDFelement and launch it on your computer;

Step 2. Open a PDF file and click Tool from the menu bar;

Step 3. Select Flatten File and your PDF file will get flattened in seconds.

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Now you can send your PDF files away without worrying about them getting changed by the recipients. By flattening PDFs in advance, it’s much more reliable and convenient to make PDF non-editable.

Final Thoughts

This article goes over how to make PDF non-editable as well as why you should do so. It also introduced you to a simple PDF application for setting passwords on PDF files to restrict alteration. Furthermore, while we've discussed three approaches for making a PDF non-editable, the password-protected option is the most dependable. It has the ability to maintain your PDF files exactly as they were produced.

Monica

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Monica has more than three years of experience in writing tech products. And she has been a fan of SwifDoo PDF since it was released. Now she works as a full-time editor for SwifDoo PDF. With her extensive experience, Monica has offered many helpful and feasible recommendations for PDF tools.

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