diff --git a/certy.ps1 b/certy.ps1
index f805598..844ac9d 100644
--- a/certy.ps1
+++ b/certy.ps1
@@ -130,6 +130,33 @@ function Save-Defaults {
     Set-Content -Path $path -Value $json -Encoding ascii
 }
 
+function Get-ReplicationCredentialPath {
+    $dir = Join-Path $env:ProgramData "Certy"
+    return Join-Path $dir "replication-cred.xml"
+}
+
+function Load-ReplicationCredential {
+    $path = Get-ReplicationCredentialPath
+    if (-not (Test-Path -Path $path -PathType Leaf)) { return $null }
+    try {
+        $cred = Import-Clixml -Path $path
+        if ($cred -is [pscredential]) { return $cred }
+    } catch {
+        # Ignore load errors and treat as missing.
+    }
+    return $null
+}
+
+function Save-ReplicationCredential {
+    param([pscredential]$Credential)
+    $path = Get-ReplicationCredentialPath
+    $dir = Split-Path -Path $path -Parent
+    if (-not (Test-Path -Path $dir -PathType Container)) {
+        New-Item -Path $dir -ItemType Directory -Force | Out-Null
+    }
+    $Credential | Export-Clixml -Path $path
+}
+
 function Get-DefaultValue {
     param(
         [object]$Defaults,
@@ -658,6 +685,14 @@ $replicationRemoteBox = Add-CheckBox "Run repadmin remotely (PowerShell)" $xInpu
 $replicationRemoteBox.Checked = $true
 $y += $rowHeight + $gap
 
+$replicationCredBtn = New-Object System.Windows.Forms.Button
+$replicationCredBtn.Text = "Set Replication Credentials"
+$replicationCredBtn.Location = [System.Drawing.Point]::new($xInput, $y)
+$replicationCredBtn.Size = [System.Drawing.Size]::new(220, 26)
+$panel.Controls.Add($replicationCredBtn)
+Style-ButtonSecondary $replicationCredBtn
+$y += $rowHeight + $gap
+
 $y += $gap
 
 Add-SectionHeader "ACME / Output"
@@ -768,6 +803,7 @@ function Update-ReplicationUI {
     $replicationCmdBox.Enabled = $enabled
     $replicationDelayBox.Enabled = $enabled
     $replicationRemoteBox.Enabled = $enabled
+    $replicationCredBtn.Enabled = $enabled
     $dnsListBox.Enabled = $enabled
 }
 
@@ -898,6 +934,7 @@ function Apply-Layout {
     $replicationCmdBox.Width = $inputWidthCalc
     $replicationDelayBox.Width = $inputWidthCalc
     $replicationRemoteBox.Width = $inputWidthCalc
+    $replicationCredBtn.Width = [Math]::Min($inputWidthCalc, 260)
     $wacsPathBox.Width = $inputWidthCalc
     $outputTypeBox.Width = $inputWidthCalc
     $outputPathBox.Width = $inputWidthCalc
@@ -1035,6 +1072,16 @@ $outputTypeBox.Add_SelectedIndexChanged({
     Update-OutputTypeUI
 })
 
+$replicationCredBtn.Add_Click({
+    $cred = Get-Credential -Message "Enter credentials for replication sessions."
+    if (-not $cred) {
+        & $logAction "Replication credentials not set."
+        return
+    }
+    Save-ReplicationCredential -Credential $cred
+    & $logAction "Replication credentials saved for this user."
+})
+
 $hostsBox.Add_TextChanged({
     Update-ZoneFromHostInput
 })
@@ -1139,10 +1186,15 @@ $runBtn.Add_Click({
             }
             $replicationCredential = $null
             if ($replicationRemoteBox.Checked) {
-                $replicationCredential = Get-Credential -Message "Enter credentials for replication targets."
+                $replicationCredential = Load-ReplicationCredential
                 if (-not $replicationCredential) {
-                    & $logAction "Replication canceled: credentials not provided."
-                    return
+                    $replicationCredential = Get-Credential -Message "Enter credentials for replication targets."
+                    if (-not $replicationCredential) {
+                        & $logAction "Replication canceled: credentials not provided."
+                        return
+                    }
+                    Save-ReplicationCredential -Credential $replicationCredential
+                    & $logAction "Replication credentials saved for this user."
                 }
             }
             Invoke-Replication -Servers $replicationTargets -Command $replicationCmdBox.Text -UseRemote $replicationRemoteBox.Checked -Credential $replicationCredential -Log $logAction