PDF Printing Issues

Where Windows Stores Custom Acrobat PDF Paper Sizes

Amos GikundaAmos Gikunda Oct 28, 2026 868 views

Question details

The user needs to locate where custom PDF paper sizes are stored in Windows to migrate these settings from an old Windows 7 computer to a new Windows 10 computer.

Product
Adobe Acrobat, Windows
Device & OS
Windows 7, Windows 10
Scenario
Setting up a new computer and transferring existing custom print settings and paper sizes so they do not have to be manually recreated.
Observed behavior
Custom PDF paper sizes do not automatically transfer with software installations and must be manually recreated or exported via the system registry.
Before you start

Modifying the Windows Registry can cause system instability if done incorrectly. Ensure you create a System Restore point or back up your Registry before exporting and importing these system settings.

Solution 1Recommended

Migrate Custom Paper Sizes via Windows Registry

Export the specific registry key containing your custom print forms from the old PC and import it to the new one.

Windows stores system-wide print forms, including custom PDF page sizes created for Adobe Acrobat, directly in the Registry. Transferring these keys is the most efficient method if you have created multiple custom dimensions.

1
Open Registry Editor on the old PC

On the old Windows 7 computer, press Win + R, type 'regedit' into the Run dialog, and press Enter to open the Registry Editor.

2
Navigate to the Print Forms key

In the left pane, navigate to the following path: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Print\Forms.

3
Export the registry key

Right-click the 'Forms' folder, select 'Export', name the file, and save this .reg file to a USB flash drive.

4
Import to the new PC

Plug the USB drive into your new Windows 10 computer, double-click the .reg file, and click 'Yes' when prompted to merge the keys into the new registry.

5
Restart the computer

Restart your Windows 10 computer to ensure the Print Spooler service reads the newly imported custom paper sizes.

Migrate Custom Paper Sizes via Windows Registry
Administrator Privileges Required: You must be logged in with an Administrator account on both computers to access, export, and merge HKEY_LOCAL_MACHINE registry keys.
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Frequently Asked Questions

Can I transfer custom PDF paper sizes to another user account on the same PC?

Yes. Because the custom paper sizes are stored in the HKEY_LOCAL_MACHINE registry hive, they are applied system-wide. Any user logging into that specific computer will have access to the same custom PDF forms in their print dialog.

Why aren't my custom paper sizes showing up in the Acrobat print dialog after importing?

Sometimes the Print Spooler service needs to be refreshed to recognize the new registry entries. Ensure you have completely restarted your PC after importing the .reg file. Additionally, verify that the custom form dimensions do not exceed the maximum limits allowed by the PDF printer driver.

Is it safe to edit or export the Print Forms registry key?

Exporting and importing the specific 'Print\Forms' key is generally safe. However, modifying or deleting other keys in the CurrentControlSet can cause system instability or printer failures, which is why creating a system restore point or registry backup beforehand is highly recommended.