diff --git a/README.md b/README.md
index dbaebf9..86c5eb4 100644
--- a/README.md
+++ b/README.md
@@ -61,12 +61,20 @@ This repo bundles two skills (`humanize` and `ai-check`) in their own subdirecto
 
 If you use multiple agents (Claude Code, Codex CLI, ChatGPT desktop), install to all three skill directories at once:
 
+**Linux / macOS (Bash):**
 ```bash
 git clone https://github.com/harshaneel/humanize.git
 cd humanize && ./install.sh all
 ```
 
-This installs to `~/.claude/skills/`, `~/.codex/skills/`, and `~/.agents/skills/`. Add `--copy` if you prefer self-contained files over symlinks.
+**Windows (PowerShell):**
+```powershell
+git clone https://github.com/harshaneel/humanize.git
+cd humanize; .\install.ps1 all
+```
+
+This installs to `~/.claude/skills/`, `~/.codex/skills/`, and `~/.agents/skills/`. Add `--copy` (Bash) or `-Copy` (PowerShell) if you prefer self-contained files over symlinks/junctions.
+
 
 ### Claude Code
 
diff --git a/install.ps1 b/install.ps1
new file mode 100644
index 0000000..5c5b84e
--- /dev/null
+++ b/install.ps1
@@ -0,0 +1,95 @@
+# PowerShell script to install humanize and ai-check skills for any agent that reads from a skills directory on Windows.
+#
+# Usage:
+#   .\install.ps1                  # Claude Code     (~/.claude/skills)
+#   .\install.ps1 codex            # Codex CLI       (~/.codex/skills)
+#   .\install.ps1 chatgpt          # ChatGPT agents  (~/.agents/skills)
+#   .\install.ps1 all              # all three of the above
+#   .\install.ps1 -Copy            # copy files instead of symlinking
+#   .\install.ps1 all -Copy        # combinable with any target
+
+$Target = "claude"
+$Mode = "symlink"
+
+foreach ($arg in $args) {
+    switch -Regex ($arg) {
+        "(?i)^claude$"  { $Target = "claude" }
+        "(?i)^codex$"   { $Target = "codex" }
+        "(?i)^chatgpt$" { $Target = "chatgpt" }
+        "(?i)^all$"     { $Target = "all" }
+        "(?i)^-copy$"   { $Mode = "copy" }
+        "(?i)^-h|--help$" {
+            Write-Host "Usage:"
+            Write-Host "  .\install.ps1                  # Install for Claude Code"
+            Write-Host "  .\install.ps1 codex            # Install for Codex CLI"
+            Write-Host "  .\install.ps1 chatgpt          # Install for ChatGPT agents"
+            Write-Host "  .\install.ps1 all              # Install for all three"
+            Write-Host "  .\install.ps1 -Copy            # Copy files instead of symlinking"
+            exit 0
+        }
+        Default {
+            Write-Error "Unknown argument: $arg`nRun with -h or --help for usage."
+            exit 1
+        }
+    }
+}
+
+$RepoDir = $PSScriptRoot
+if (-not $RepoDir) {
+    $RepoDir = Get-Location
+}
+
+$Skills = @("humanize", "ai-check")
+$Dests = @()
+
+$HomeDir = [System.Environment]::GetFolderPath("UserProfile")
+
+switch ($Target) {
+    "claude"  { $Dests += Join-Path $HomeDir ".claude\skills" }
+    "codex"   { $Dests += Join-Path $HomeDir ".codex\skills" }
+    "chatgpt" { $Dests += Join-Path $HomeDir ".agents\skills" }
+    "all"     {
+        $Dests += Join-Path $HomeDir ".claude\skills"
+        $Dests += Join-Path $HomeDir ".codex\skills"
+        $Dests += Join-Path $HomeDir ".agents\skills"
+    }
+}
+
+function Install-Into($dest) {
+    if (-not (Test-Path $dest)) {
+        New-Item -ItemType Directory -Force -Path $dest | Out-Null
+    }
+    
+    Write-Host "`nInstalling skills to $dest (mode: $Mode)"
+    
+    foreach ($skill in $Skills) {
+        $src = Join-Path $RepoDir $skill
+        $dst = Join-Path $dest $skill
+        
+        if (-not (Test-Path $src)) {
+            Write-Host "  SKIP $skill (missing source directory $src)"
+            continue
+        }
+        
+        if (Test-Path $dst) {
+            Write-Host "  removing existing $dst"
+            Remove-Item -Recurse -Force $dst
+        }
+        
+        if ($Mode -eq "symlink") {
+            # Directory junctions do not require admin privileges on Windows
+            New-Item -ItemType Junction -Path $dst -Value $src | Out-Null
+            Write-Host "  linked $skill (Junction)"
+        } else {
+            Copy-Item -Recurse -Force -Path $src -Destination $dst
+            Write-Host "  copied $skill"
+        }
+    }
+}
+
+foreach ($dest in $Dests) {
+    Install-Into $dest
+}
+
+Write-Host "`nDone. Restart your agent (or run /reload-skills in Claude Code) to pick up the new skills."
+Write-Host "Try it: ask your agent to 'humanize this paragraph' or 'run ai-check on this text'."