diff --git a/Cargo.lock b/Cargo.lock
index abfac8f..18a194d 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -40,6 +40,7 @@ dependencies = [
  "bincode",
  "bitcode_derive",
  "bytemuck",
+ "compact_str",
  "flate2",
  "glam",
  "lz4_flex",
@@ -68,6 +69,15 @@ version = "1.24.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1fbdf580320f38b612e485521afda1ee26d10cc9884efaaa750d383e13e3c5f4"
 
+[[package]]
+name = "castaway"
+version = "0.2.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dec551ab6e7578819132c713a93c022a05d60159dc86e7a7050223577484c55a"
+dependencies = [
+ "rustversion",
+]
+
 [[package]]
 name = "cc"
 version = "1.2.51"
@@ -86,6 +96,20 @@ version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9330f8b2ff13f34540b44e946ef35111825727b38d33286ef986142615121801"
 
+[[package]]
+name = "compact_str"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3fdb1325a1cece981e8a296ab8f0f9b63ae357bd0784a9faaf548cc7b480707a"
+dependencies = [
+ "castaway",
+ "cfg-if",
+ "itoa",
+ "rustversion",
+ "ryu",
+ "static_assertions",
+]
+
 [[package]]
 name = "crc32fast"
 version = "1.5.0"
@@ -152,6 +176,12 @@ dependencies = [
  "rand",
 ]
 
+[[package]]
+name = "itoa"
+version = "1.0.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8f42a60cbdf9a97f5d2305f08a87dc4e09308d1276d28c869c684d7777685682"
+
 [[package]]
 name = "jobserver"
 version = "0.1.34"
@@ -290,6 +320,18 @@ dependencies = [
  "num-traits",
 ]
 
+[[package]]
+name = "rustversion"
+version = "1.0.22"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b39cdef0fa800fc44525c84ccb54a029961a8215f9619753635a9c0d2538d46d"
+
+[[package]]
+name = "ryu"
+version = "1.0.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9774ba4a74de5f7b1c1451ed6cd5285a32eddb5cccb8cc655a4e50009e06477f"
+
 [[package]]
 name = "serde"
 version = "1.0.228"
@@ -332,6 +374,12 @@ version = "0.3.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e320a6c5ad31d271ad523dcf3ad13e2767ad8b1cb8f047f75a8aeaf8da139da2"
 
+[[package]]
+name = "static_assertions"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a2eb9349b6444b326872e140eb1cf5e7c522154d69e7a0ffb0fb81c06b37543f"
+
 [[package]]
 name = "syn"
 version = "2.0.114"
diff --git a/Cargo.toml b/Cargo.toml
index 46cc43e..7299ce1 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -18,6 +18,7 @@ exclude = ["fuzz/"]
 arrayvec = { version = "0.7", default-features = false, optional = true }
 bitcode_derive = { version = "=0.6.9", path = "./bitcode_derive", optional = true }
 bytemuck = { version = "1.14", features = [ "min_const_generics", "must_cast" ] }
+compact_str = { version = "0.9.0", optional = true }
 glam = { version = ">=0.21", default-features = false, optional = true }
 rust_decimal = { version = "1.36", default-features = false, optional = true }
 serde = { version = "1.0", default-features = false, features = [ "alloc" ], optional = true }
diff --git a/src/ext/compact_str.rs b/src/ext/compact_str.rs
new file mode 100644
index 0000000..0bdc874
--- /dev/null
+++ b/src/ext/compact_str.rs
@@ -0,0 +1,62 @@
+use crate::coder::{Decoder, Encoder};
+use crate::derive::{Decode, Encode};
+use crate::str::{StrDecoder, StrEncoder};
+use compact_str::CompactString;
+
+impl Encoder<CompactString> for StrEncoder {
+    #[inline(always)]
+    fn encode(&mut self, t: &CompactString) {
+        self.encode(t.as_str())
+    }
+}
+
+impl Encode for CompactString {
+    type Encoder = StrEncoder;
+}
+
+impl<'a> Decoder<'a, CompactString> for StrDecoder<'a> {
+    #[inline(always)]
+    fn decode(&mut self) -> CompactString {
+        let s: &str = self.decode();
+        s.into()
+    }
+}
+
+impl<'a> Decode<'a> for CompactString {
+    type Decoder = StrDecoder<'a>;
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::{decode, encode};
+    use alloc::vec::Vec;
+    use compact_str::CompactString;
+
+    #[test]
+    fn compact_string() {
+        let mut v = CompactString::default();
+        v.push('0');
+        v.push('1');
+        let b = encode(&v);
+        assert_eq!(decode::<CompactString>(&b).unwrap(), v);
+    }
+
+    #[test]
+    fn compact_string_long() {
+        // CompactString inlines up to 23 bytes on 64-bit platforms; the English alphabet exceeds that at 26 bytes.
+        let v = CompactString::new("abcdefghijklmnopqrstuvwxyz");
+        let b = encode(&v);
+        assert_eq!(decode::<CompactString>(&b).unwrap(), v);
+    }
+
+    #[test]
+    fn compact_string_vec() {
+        let v = vec![
+            CompactString::new("01"),
+            CompactString::new("abcdefghijklmnopqrstuvwxyz"),
+        ];
+        let b = encode(&v);
+        let v2 = decode::<Vec<CompactString>>(&b).unwrap();
+        assert_eq!(v, v2);
+    }
+}
diff --git a/src/ext/mod.rs b/src/ext/mod.rs
index 869e0b8..6c7ce92 100644
--- a/src/ext/mod.rs
+++ b/src/ext/mod.rs
@@ -1,5 +1,7 @@
 #[cfg(feature = "arrayvec")]
 mod arrayvec;
+#[cfg(feature = "compact_str")]
+mod compact_str;
 #[cfg(feature = "glam")]
 #[rustfmt::skip] // Makes impl_struct! calls way longer.
 mod glam;