diff --git a/src/cli/Build.go b/src/cli/Build.go
index 087d6c1..2941400 100644
--- a/src/cli/Build.go
+++ b/src/cli/Build.go
@@ -56,6 +56,8 @@ func buildExecutable(args []string) (*build.Build, error) {
 				config.SetTargetArch(config.ARM)
 			case "x86":
 				config.SetTargetArch(config.X86)
+			case "wasm":
+				config.SetTargetArch(config.WASM)
 			default:
 				return b, &InvalidValueError{Value: args[i], Parameter: "arch"}
 			}
@@ -72,6 +74,8 @@ func buildExecutable(args []string) (*build.Build, error) {
 				config.TargetOS = config.Linux
 			case "mac":
 				config.TargetOS = config.Mac
+			case "web":
+				config.TargetOS = config.Web
 			case "windows":
 				config.TargetOS = config.Windows
 			default:
diff --git a/src/compiler/Write.go b/src/compiler/Write.go
index bb14745..cc1981f 100644
--- a/src/compiler/Write.go
+++ b/src/compiler/Write.go
@@ -9,6 +9,7 @@ import (
 	"git.urbach.dev/cli/q/src/elf"
 	"git.urbach.dev/cli/q/src/macho"
 	"git.urbach.dev/cli/q/src/pe"
+	"git.urbach.dev/cli/q/src/wasm"
 )
 
 // Write writes the executable to the given writer.
@@ -25,6 +26,8 @@ func write(writer io.Writer, code []byte, data []byte, dlls dll.List) error {
 		elf.Write(buffer, code, data)
 	case config.Mac:
 		macho.Write(buffer, code, data)
+	case config.Web:
+		wasm.Write(buffer, code, data)
 	case config.Windows:
 		pe.Write(buffer, code, data, dlls)
 	}
diff --git a/src/config/arch.go b/src/config/arch.go
index 33eacf7..7f5064f 100644
--- a/src/config/arch.go
+++ b/src/config/arch.go
@@ -5,5 +5,6 @@ type Arch uint8
 const (
 	UnknownArch Arch = iota
 	ARM
+	WASM
 	X86
 )
diff --git a/src/config/config.go b/src/config/config.go
index 74a3a5f..4f2b8f6 100644
--- a/src/config/config.go
+++ b/src/config/config.go
@@ -26,6 +26,8 @@ func Reset() {
 		SetTargetArch(X86)
 	case "arm64":
 		SetTargetArch(ARM)
+	case "wasm":
+		SetTargetArch(WASM)
 	default:
 		SetTargetArch(UnknownArch)
 	}
@@ -35,6 +37,8 @@ func Reset() {
 		TargetOS = Linux
 	case "darwin":
 		TargetOS = Mac
+	case "js":
+		TargetOS = Web
 	case "windows":
 		TargetOS = Windows
 	default:
diff --git a/src/config/os.go b/src/config/os.go
index 48ed743..de8c011 100644
--- a/src/config/os.go
+++ b/src/config/os.go
@@ -6,5 +6,6 @@ const (
 	UnknownOS OS = iota
 	Linux
 	Mac
+	Web
 	Windows
 )
diff --git a/src/core/NewFunction.go b/src/core/NewFunction.go
index abb26ab..975ffa2 100644
--- a/src/core/NewFunction.go
+++ b/src/core/NewFunction.go
@@ -8,18 +8,21 @@ import (
 	"git.urbach.dev/cli/q/src/fs"
 	"git.urbach.dev/cli/q/src/register"
 	"git.urbach.dev/cli/q/src/scope"
+	"git.urbach.dev/cli/q/src/wasm"
 	"git.urbach.dev/cli/q/src/x86"
 )
 
 // NewFunction creates a new function.
 func NewFunction(pkg string, name string, file *fs.File) *Function {
-	var cpu *cpu.CPU
+	var c *cpu.CPU
 
 	switch config.TargetArch {
 	case config.ARM:
-		cpu = &arm.CPU
+		c = &arm.CPU
+	case config.WASM:
+		c = &wasm.CPU
 	case config.X86:
-		cpu = &x86.CPU
+		c = &x86.CPU
 	}
 
 	return &Function{
@@ -34,7 +37,7 @@ func NewFunction(pkg string, name string, file *fs.File) *Function {
 			Stack: scope.Stack{
 				Scopes: []*scope.Scope{{}},
 			},
-			CPU: cpu,
+			CPU: c,
 		},
 	}
 }
diff --git a/src/wasm/CPU.go b/src/wasm/CPU.go
new file mode 100644
index 0000000..24935c5
--- /dev/null
+++ b/src/wasm/CPU.go
@@ -0,0 +1,11 @@
+package wasm
+
+import "git.urbach.dev/cli/q/src/cpu"
+
+var (
+	CPU = cpu.CPU{
+		Input:        []cpu.Register{0, 1, 2, 3, 4, 5},
+		Output:       []cpu.Register{0, 1, 2, 3, 4, 5},
+		NumRegisters: 0,
+	}
+)
diff --git a/src/wasm/WASM.go b/src/wasm/WASM.go
new file mode 100644
index 0000000..d388043
--- /dev/null
+++ b/src/wasm/WASM.go
@@ -0,0 +1,13 @@
+package wasm
+
+import (
+	"io"
+)
+
+const HeaderEnd = 8
+
+// Write writes the WASM format to the given writer.
+func Write(writer io.Writer, codeBytes []byte, dataBytes []byte) {
+	writer.Write([]byte{0x00, 0x61, 0x73, 0x6D})
+	writer.Write([]byte{0x01, 0x00, 0x00, 0x00})
+}