diff --git a/crates/bitwarden-wasm-internal/build.ps1 b/crates/bitwarden-wasm-internal/build.ps1
new file mode 100644
index 000000000..9527713e8
--- /dev/null
+++ b/crates/bitwarden-wasm-internal/build.ps1
@@ -0,0 +1,40 @@
+# Move to the root of the repository
+Set-Location -Path (Join-Path (Get-Location) "..\..")
+
+# Write VERSION file
+git rev-parse HEAD | Out-File -FilePath ./crates/bitwarden-wasm-internal/npm/VERSION -Force
+
+if ($args[0] -ne "-r") {
+    Write-Host "Building in debug mode"
+    $RELEASE_FLAG = ""
+    $BUILD_FOLDER = "debug"
+} else {
+    Write-Host "Building in release mode"
+    $RELEASE_FLAG = "--release"
+    $BUILD_FOLDER = "release"
+}
+
+# Build with MVP CPU target, two reasons:
+# 1. It is required for wasm2js support
+# 2. While webpack supports it, it has some compatibility issues that lead to strange results
+# Note that this requirest build-std which is an unstable feature,
+# this normally requires a nightly build, but we can also use the 
+# RUSTC_BOOTSTRAP hack to use the same stable version as the normal build
+$env:RUSTFLAGS = "-Ctarget-cpu=mvp"
+$env:RUSTC_BOOTSTRAP = "1"
+cargo build -p bitwarden-wasm-internal -Zbuild-std="panic_abort,std" --target wasm32-unknown-unknown $RELEASE_FLAG
+
+# Run wasm-bindgen
+wasm-bindgen --target bundler --out-dir crates/bitwarden-wasm-internal/npm ./target/wasm32-unknown-unknown/$BUILD_FOLDER/bitwarden_wasm_internal.wasm
+wasm-bindgen --target nodejs --out-dir crates/bitwarden-wasm-internal/npm/node ./target/wasm32-unknown-unknown/$BUILD_FOLDER/bitwarden_wasm_internal.wasm
+
+# Format
+npx prettier --write ./crates/bitwarden-wasm-internal/npm
+
+# Optimize size
+wasm-opt -Os ./crates/bitwarden-wasm-internal/npm/bitwarden_wasm_internal_bg.wasm -o ./crates/bitwarden-wasm-internal/npm/bitwarden_wasm_internal_bg.wasm
+wasm-opt -Os ./crates/bitwarden-wasm-internal/npm/node/bitwarden_wasm_internal_bg.wasm -o ./crates/bitwarden-wasm-internal/npm/node/bitwarden_wasm_internal_bg.wasm
+
+# Transpile to JS
+wasm2js ./crates/bitwarden-wasm-internal/npm/bitwarden_wasm_internal_bg.wasm -o ./crates/bitwarden-wasm-internal/npm/bitwarden_wasm_internal_bg.wasm.js
+npx terser ./crates/bitwarden-wasm-internal/npm/bitwarden_wasm_internal_bg.wasm.js -o ./crates/bitwarden-wasm-internal/npm/bitwarden_wasm_internal_bg.wasm.js