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7 Easy Ways | How to Make a PDF Non-Editable for Free 

July 3, 2022
Last Updated
June 6, 2024
2 min read
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Non-editable PDFs are PDF documents that have been locked and secured to prevent editing. 

This can be useful if sending reports, important documents, final drafts, or anything that you wouldn't want others to make changes to. 

Whether it be academic or business reasons, non-editable PDFs are a great way to share documents with others, while resting assured that the PDF won't be changed. 

But how do you make a regular PDF non-editable? We’ll show you the best methods below, so keep reading!

What to Know Before You Start

There are two main ways to make a PDF a non-editable:

  1. Flatten the PDF document to remove interactivity (such as fillable form fields, if they exist).
  2. Use a PDF editor to secure and lock the PDF with a password.

Quick Tips:

  • In order to lock a PDF with a password, you need to use a PDF editor. (You can download PDF Pro for free if you don't have one.) Try PDF Pro for free
  • You can flatten PDFs for free in a browser (print to PDF) or by taking a screenshot and saving the PDF as an image. 
  • To be extra safe, you may want to use both of these methods on your PDF; especially if it is a fillable form (i.e. you'd flatten and lock the PDF). 

Lock a PDF with Encryption to Save it as Read-Only 

The most common way to make PDF non-editable is to secure the PDF with a password that changes the PDF to “read-only”.

You can lock a PDF by setting a password that is secured with encryption.

This means that others will be able to open and view your PDF document, but won't be able to make edits to it. 

The easiest way to save a PDF as read-only is by using a PDF editor that is capable of securing and locking documents. 

Don't have a PDF editor? No problem! Try PDF Pro for free today and secure your PDF instantly.

Lock a PDF with a PDF Editor (Windows)

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1. Open the PDF in PDF Pro. 

2. Press the Secure tab.

Secure tab highlighted in PDF Pro.

3. Press the Password button. 

Password button highlighted in PDF Pro.

4. In the dialog box, under the Permission section, Click the checkbox that says: “Require a password to change security settings and access specific functions" and select None from the Changes allowed dropdown menu.

File security properties dialog box, with the fields highlighted showing that no changes can be made to the document.

5. Set and confirm your password, then press Finish.

File securities properties dialog box with a password set. The Finish button is red.

Lock a PDF with Adobe Acrobat (Windows & Mac)

  1. Open the PDF in Adobe Acrobat.
  2. Go to File > Protect Using Password.
  3. Choose Editing as the action to restrict.
  4. Set and confirm the password, then save the document.

Lock a PDF with Preview on Mac

  1. Open the PDF in Preview.
  2. Go to File > Export.
  3. Check Encrypt and set a password.
  4. Save the document.

Flatten Your PDF Files to Prevent Editing

Especially for fillable PDF forms, before saving or sending it to others, you can flatten the PDF to paint the contents permanently onto the PDF document. 

This will remove the interactive functionality of the PDF form, but can prevent unwanted edits to the fillable forms. 

Note: Flattening fields cannot be undone. So if you plan on needing to work with these form fields again, be sure to keep the original document, and save the flattened PDF as a new document (Click: File > Save As

Flatten a PDF with a PDF Editor (Windows)

1. Open the PDF in PDF Pro. 

2. Press the Create tab. 

Create tab highlighted in PDF Pro.

3. Press the Flatten file button. 

Flatten file button highlighted in PDF Pro.

4. Press Create

Flatten PDF document dialog box. The create button is red.

Flatten a PDF with a PDF Editor (Windows)

1. Open the PDF in PDF Pro. 

2. Press the Create tab. 
3. Press the Flatten file button. 
4. Press Create

Flatten a PDF with Adobe Acrobat

  1. Open the PDF in Adobe Acrobat.
  2. Go to File > Print.
  3. Select Adobe PDF as the printer.
  4. Click Print and save the document.

Flatten a PDF for Free in Your Browser (Chrome, Edge, etc.)

If you’re just looking to flatten your PDF document, and don’t need to add extra security permissions, such as a password, you can do that using your built-in browser on your computer. 

Popular browsers are Google Chrome and Microsoft Edge, but the process will be similar for any browser that can view and print PDFs. 

1. Open the PDF that you want to flatten in the browser of your choice. 

2. Press Print (or [ctrl] + [p] on your keyboard).

Print button is Microsoft Edge.

3. Set your Printer to Microsoft Print to PDF, then press Print.

Print dialog box. Printer is set to Microsoft Print to PDF; this field and the Print button are highlighted.

4. Choose a destination & name for your flattened PDF, then press Save. (Tip: if you’ll need the fillable fields later, be sure to keep the original file). 

Save Print Output As dialog box with the Print button highlighted.

Flatten a PDF by Taking a Screenshot

Another free way to flatten a PDF document is by turning the document into an image; the easiest way to do this is by taking a screenshot of it. This works best if the document is a single page.

1. Open the PDF document. 

2. Zoom out until you can see the whole document on your screen. 

3. Press [Windows key] + [shift] + [s] on your keyboard (or type Snipping Tool into the Windows search bar on the bottom left of your screen). Your screen will appear to be grayed out.

4. Use your mouse to click-and-drag until your entire PDF is within the non-grayed out area.

5. Click the PDF thumbnail that appears on the bottom right of your screen.

Snip & Sketch thumbnail of a screenshot taken.

6. In the Snipping Tool dialog box, press Save

Save button highlighted in the Snip & Sketch dialog box.

7. Choose a destination & name for your new image of your PDF, then press Save

Save As dialog box with the File name field, and the Save button, highlighted.


We’ve listed some frequently asked questions regarding how to make a PDF non-editable, for further help and information.

How Do I Save a Fillable PDF as Read Only?

To save a fillable PDF as read-only you will need to flatten and lock the PDF by using a PDF editor. 

To do this in PDF Pro: 

  1. Create tab.
  2. Flatten file.
  3. Create.
  4. Secure tab.
  5. Password.
  6. Click the checkbox: “Require a password to change security settings and access specific functions.”
  7. Select None from the “Changes allowed” dropdown menu.
  8. Set and confirm password.
  9. Finish.

How Can I Make a PDF Not Allow Editing?

To make a PDF non-editable you will need a PDF editor that can set lock permissions on a PDF. 

To do this in PDF Pro: 

Secure tab > Password >  Click checkbox: “Require a password to change security settings and access specific functions.” > None > Set and confirm password > Finish.

Do More with your PDF Documents 

When it comes to PDF documents, flattening and locking are just the tip of the iceberg. PDF Pro can streamline your workflow, and save you valuable time when working with documents. 

What else PDF Pro can help you with: 

Download PDF Pro for free for 15 days or Buy Now!

Digital Marketing SpecialistArron Staradub
Arron was a Digital Marketer at PDF Pro, where he wrote helpful and engaging articles for those that that used PDFs in their daily life.

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