diff --git a/uefi/src/data_types/chars.rs b/uefi/src/data_types/chars.rs
index a92c57067..ab270a82f 100644
--- a/uefi/src/data_types/chars.rs
+++ b/uefi/src/data_types/chars.rs
@@ -83,6 +83,12 @@ impl Char16 {
     pub const unsafe fn from_u16_unchecked(val: u16) -> Self {
         Self(val)
     }
+
+    /// Checks if the value is within the ASCII range.
+    #[must_use]
+    pub const fn is_ascii(&self) -> bool {
+        self.0 <= 127
+    }
 }
 
 impl TryFrom<char> for Char16 {
diff --git a/uefi/src/data_types/strs.rs b/uefi/src/data_types/strs.rs
index 4cfd2f7c4..9e22be51a 100644
--- a/uefi/src/data_types/strs.rs
+++ b/uefi/src/data_types/strs.rs
@@ -415,6 +415,12 @@ impl CStr16 {
         self.0.len() * 2
     }
 
+    /// Checks if all characters in this string are within the ASCII range.
+    #[must_use]
+    pub fn is_ascii(&self) -> bool {
+        self.0.iter().all(|c| c.is_ascii())
+    }
+
     /// Writes each [`Char16`] as a [`char`] (4 bytes long in Rust language) into the buffer.
     /// It is up to the implementer of [`core::fmt::Write`] to convert the char to a string
     /// with proper encoding/charset. For example, in the case of [`alloc::string::String`]