Contents

Introduction:
PDF is prevalent owing to the compatibility with multiple OS and the capability to include interactive elements, such as fillable form fields. These PDF forms are layers placed on a PDF document, and hence can be easily tampered with. This is not exactly what we want, isn't it? Therefore, how can we make this PDF uneditable on top of password protection? A flattened PDF can help. What exactly is a flattened PDF? How do I flatten a PDF?
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What Does It Mean to Flatten a PDF?

A flattened PDF refers to a document only with one single layer and is thus printing-friendly. Interactive elements, like forms or annotations, are image layers on a document. They can be easily modified by others. Flattening a PDF implies removing transparency, combining several layers into a single unit, and locking comments, form fields, layers, or any other interactive components in PDFs.

If you use programs like Adobe InDesign or Photoshop to create a PDF from layered documents, the PDF is bound to have several layers, some of which are transparent and invisible. A printer, on the other hand, can only recognize and print visible onscreen content, not all visual elements from several layers. Follow the tutorial below to figure out how to flatten a PDF.

Flatten a PDF on Windows

Adobe Acrobat

Although the steep subscription fee and sophisticated functionality, Adobe still holds a safe lead in the document management industry. Adobe Acrobat is a comprehensive PDF program with a wide spectrum of features to ease PDF-related tasks. Regarding how to flatten a PDF on Windows, the software offers two intuitive methods to convert a PDF into a flattened document,

By Adobe Acrobat Reader

Users of Adobe Reader can flatten a PDF document in diverse ways. The most effortless way, however, is to utilize the “Print” feature to save this multi-layered document into a flattened one. Here’s how to do it:

Step 1: Download and install Adobe Acrobat on your device;

Step 2: Launch the program and upload the PDF that needs to be flattened;

Step 3: Navigate to the main taskbar, and click File > Print. In the drop-down menu of Printer, choose Adobe Printer;

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Step 4: Remember to select Document and Markups in the Comments & Forms box. Meanwhile, Summarize Comments is available as well to flatten this PDF. When ready, tap on the Print button.

By Adobe Acrobat Pro DC on Windows

If you are running the Adobe Acrobat DC, an advanced version of the Reader, the steps may be somewhat different. Let’s take a closer look at how to flatten a PDF using the Acrobat:

Step 1: Download the program from the official website;

Step 2: Start the software and load up a PDF to the workstation;

Step 3: Go click Tools on the ribbon, then choose Print Production;

Step 4: When a new window appears, locate the Flattener Preview. Once you finish all the settings, click Apply to make this PDF a flattened one.

Note: Adobe Acrobat enables users to set raster/vector balance, alter the transparency, perform PDF compressions, etc.

SwifDoo PDF

The truth to be told, the process of flattening a PDF is to transform the data stored in a PDF into a flat image. Among all image formats, JPEG is the optimal one. SwifDoo PDF is an all-around PDF converter that can perform multiple file conversions, including PDF to JPEG. Here’s a quick look at flattening a PDF by converting this PDF to a JPEG:

Step 1: Go download SwifDoo PDF from the official website and Microsoft AppSource;

Step 2: Install and launch the program, then upload a PDF to the workspace;

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Step 3: Click Convert > PDF to Image. When the converter pops up, select JPG in the drop-down menu of Format. Hit the Convert button to save your new flattened file, a JPEG file.

                                                                        Free Download

If all you need is a flattened PDF, then convert the JPEG file back to PDF using SwifDoo PDF. Admittedly, this approach is not straightforward but workable. An image file is not editable unless you utilize professional photo editors to make edits. Otherwise, all interactive elements within will be flattened without any layers. It is indeed a static image file.  

Flatten a PDF on Mac

Preview

If you’re looking for an app on macOS to flatten a PDF, look no further than the default PDF viewer Preview. Mac users are no stranger to this program since it is an inbuilt image viewer on the device. Preview is not an advanced PDF editor or converter on macOS, it can however flatten, annotate, convert, and password protect a PDF. Follow the instruction to know how to flatten a PDF on Mac:

Step 1: Start the Preview and open a PDF;

Step 2: Navigate to the File tab;

Step 3: Click Print in the drop-down menu, or press Command + P on your keyboard to open the printer.

As we mentioned above, Preview is not a comprehensive PDF software program on macOS. When you fail to modify PDF documents, the thought occurs that you need a dedicated PDF tool. Of course, you can resort to online tools if required to flatten a PDF. No registration and login, with several clicks  

Flatten a PDF Online

PDFReal

This online PDF is one of those products that can flatten a PDF. It can compress PDF, convert PDF to text, merge and split PDF, as well as protect PDF. What’s most important, PDFReal is free of charge without any limitations on free tasks. Here’s how to flatten a PDF online:

Step 1: Type the website on the search bar;

Step 2: Select Flatten PDF on the homepage;

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Step 3: Click on the Choose File button and then hit Flatten. Seconds later, a flattened PDF will be automatically downloaded to your local folder.

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AvePDF

If you need a much more comprehensive web-based PDF application to process PDF-related jobs, AvePDF is the one you won’t miss out on. This application is capable of converting, organizing, editing, protecting, and optimizing PDF documents. It integrates more than 30 features to simplify everything you do with PDFs. Concerning how to flatten a PDF online, AvePDF and PDFReal all make the flattening process no sweat:

Step 1: Go to the official website of AvePDF, click the Edit tab and choose Flatten PDF;

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Step 2: Upload your PDF from local folders, Google Drive, Dropbox, or web address;

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Step 3: Choose elements you need to flatten: Layers or Annotations.

When you choose the “Layers” mode, your PDF will be flattened at once. However, when you click on the “Annotations” mode, things become different. AvePDF needs users to choose whether to flatten annotations or form fields, and the page range to flatten. Compared with PDFReal, AvePDF offers more options to flatten a PDF.

Final Thoughts

As an effective method to protect information within PDF documents, a flattened PDF removes all annotations, layers, and form fields. Users won’t worry about if your PDF can be modified randomly by others, particularly when your file has interactive elements. We hope the provided solutions can answer your questions and help flatten a PDF with ease.

title: Why Should I Flatten a PDF?

content: In a read-only PDF, interactive properties like forms, annotations, and layers will not be fillable. For designers, it can safeguard a PDF's design and forms. If you have an editable PDF form, you must flatten it to protect the data. Furthermore, some publishers ask you to provide a PDF file after flattening to suit their requirements. Last but not least, if your PDF has a lot of layers, it’s not printing-friendly and it may not print the way you want it to. As a result, you'll need a dedicated PDF editor to flatten a PDF.

Common FAQ about How to Easily Flatten a PDF in Few Steps

Q:How do I know whether a PDF is a flattened one?

Generally, we have two ways to check if a PDF has been flattened or not:

A: By accessing the highlight feature. Your text cannot be identified or recognized if the PDF is flattened;

B: By double-clicking a text field or form field to see if it is editable. A flattened PDF does not contain editable fields.

Q:Why Should I Flatten a PDF?

In a read-only PDF, interactive properties like forms, annotations, and layers will not be fillable. For designers, it can safeguard a PDF's design and forms. If you have an editable PDF form, you must flatten it to protect the data. Furthermore, some publishers ask you to provide a PDF file after flattening to suit their requirements. Last but not least, if your PDF has a lot of layers, it’s not printing-friendly and it may not print the way you want it to. As a result, you'll need a dedicated PDF editor to flatten a PDF.

Roche

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Roche has been an active PDF user for 6 years and tried different types of professional PDF tools (both online and desktop version) since at his bachelor degree. Now, Roche works as a columnist for SwifDoo PDF over the course of the last one year, and provides useful and practical solutions pertaining to various PDF topics for users from different features.