Fix Paper Size Reverting to Letter Despite A4 Default in Windows 11

Quick fix: Set the paper size as the printer’s default via Set-PrintConfiguration in elevated PowerShell, not just in Control Panel preferences. Many drivers store the “preferences” default per-user but ignore it for new print jobs, which read from the system-wide queue config.

You set A4 as the default paper size in the printer’s preferences (via Control Panel or Settings). New documents from Word print correctly. But after a reboot or a different app, prints revert to Letter. The size setting didn’t persist where it needed to.

Where the default actually lives

Print preferences in Windows have two layers: per-user (what you set in Printing preferences) and per-printer queue (the actual default used for new jobs). Many drivers shipped from US-based manufacturers ship with Letter as the queue default regardless of region. The per-user setting only takes effect within apps that read from it explicitly; others read the queue default.

Method 1: Set the printer queue default via PowerShell

1. Open elevated PowerShell.
2. Run Get-Printer | Select Name to find your printer name.
3. Run Set-PrintConfiguration -PrinterName “YourPrinter” -PaperSize A4.
4. Verify: Get-PrintConfiguration -PrinterName “YourPrinter” — PaperSize reads A4.
5. This sets the queue-level default. New prints use A4.

Method 2: Set via Properties

1. Settings → Bluetooth & devices → Printers & scanners → your printer → Printer properties.
2. Click Preferences at the bottom.
3. Set paper size to A4.
4. BUT — close the dialog with Apply, NOT just OK in some drivers, to write to the queue default.

Method 3: Set Windows regional default

1. Control Panel → Region.
2. Set your region to one where A4 is the standard (e.g., United Kingdom).
3. This influences new printer installations to default to A4.

Verification

• Print test page. The size is A4.
• Get-PrintConfiguration output: PaperSize A4.
• Reboot and reprint — still A4.

If none of these work

If the queue default keeps reverting, the printer driver may be enforcing Letter at install time via a setup INF. Reinstall the driver after setting region first. For shared/print server queues, the server-side default takes precedence over local settings — contact the print server admin.

Bottom line: Set the queue default via PowerShell, not just per-user preferences. Set-PrintConfiguration writes to the right layer.