diff --git a/src/types.rs b/src/types.rs
index ac87f8d..e939815 100644
--- a/src/types.rs
+++ b/src/types.rs
@@ -147,6 +147,13 @@ impl From<&String> for Case {
     }
 }
 
+impl From<&[u8]> for Case {
+    fn from(s: &[u8]) -> Self {
+        let s = String::from_utf8(s.to_vec()).unwrap();
+        Self::from_str(s.as_ref()).unwrap()
+    }
+}
+
 impl FromStr for StyleGuide {
     type Err = Error;
     fn from_str(s: &str) -> Result<Self> {
diff --git a/typst/decasify.typ b/typst/decasify.typ
index 4b73c26..bf50f14 100644
--- a/typst/decasify.typ
+++ b/typst/decasify.typ
@@ -1,37 +1,46 @@
 #let _plugin = plugin("decasify.wasm")
 
-#let string-to-titlecase(text, lang, style) = {
+#let decasify-string(text, case, lang, style) = {
+  str(_plugin.case(bytes(text), bytes(case), bytes(lang), bytes(style)))
+}
+
+#let decasify(body, case, style: "default") = {
+  show regex(".+"): it => decasify(it.text, case, text.lang, style)
+  body
+}
+
+#let titlecase-string(text, lang, style) = {
   str(_plugin.titlecase(bytes(text), bytes(lang), bytes(style)))
 }
 
 #let titlecase(body, style: "default") = {
-  show regex(".+"): it => string-to-titlecase(it.text, text.lang, style)
+  show regex(".+"): it => titlecase-string(it.text, text.lang, style)
   body
 }
 
-#let string-to-lowercase(text, lang) = {
+#let lowercase-string(text, lang) = {
   str(_plugin.lowercase(bytes(text), bytes(lang)))
 }
 
 #let lowercase(body) = {
-  show regex(".+"): it => string-to-lowercase(it.text, text.lang)
+  show regex(".+"): it => lowercase-string(it.text, text.lang)
   body
 }
 
-#let string-to-uppercase(text, lang) = {
+#let uppercase-string(text, lang) = {
   str(_plugin.uppercase(bytes(text), bytes(lang)))
 }
 
 #let uppercase(body) = {
-  show regex(".+"): it => string-to-uppercase(it.text, text.lang)
+  show regex(".+"): it => uppercase-string(it.text, text.lang)
   body
 }
 
-#let string-to-sentencecase(text, lang) = {
+#let sentencecase-string(text, lang) = {
   str(_plugin.sentencecase(bytes(text), bytes(lang)))
 }
 
 #let sentencecase(body) = {
-  show regex(".+"): it => string-to-sentencecase(it.text, text.lang)
+  show regex(".+"): it => sentencecase-string(it.text, text.lang)
   body
 }
diff --git a/typst/src/lib.rs b/typst/src/lib.rs
index 7438775..f98d4ab 100644
--- a/typst/src/lib.rs
+++ b/typst/src/lib.rs
@@ -1,9 +1,18 @@
 use anyhow::Result;
-use decasify::{Locale, StyleGuide};
+use decasify::{Case, Locale, StyleGuide};
 use wasm_minimal_protocol::{initiate_protocol, wasm_func};
 
 initiate_protocol!();
 
+#[wasm_func]
+pub fn decasify(data: &[u8], case: &[u8], lang: &[u8], style: &[u8]) -> Result<Vec<u8>> {
+    let chunk = String::from_utf8(data.to_vec())?;
+    let case = Case::from(case);
+    let locale = Locale::from(lang);
+    let style = StyleGuide::from(style);
+    Ok(decasify::case(&chunk, case, locale, style).into_bytes())
+}
+
 #[wasm_func]
 pub fn titlecase(data: &[u8], lang: &[u8], style: &[u8]) -> Result<Vec<u8>> {
     let chunk = String::from_utf8(data.to_vec())?;