diff --git a/cz/src/common.rs b/cz/src/common.rs
index edb96ab..6b00e1d 100644
--- a/cz/src/common.rs
+++ b/cz/src/common.rs
@@ -66,7 +66,7 @@ pub trait CzHeader {
     fn common(&self) -> &CommonHeader;
 
     /// Turn the header into bytes equivalent to the original header from the file
-    fn to_bytes(&self) -> Result<Vec<u8>, io::Error>;
+    fn write_into<T: Seek + WriteBytesExt + Write>(&self, output: &mut T) -> Result<usize, io::Error>;
 
     /// The version of the image
     fn version(&self) -> CzVersion;
@@ -198,18 +198,21 @@ impl CzHeader for CommonHeader {
         self.unknown
     }
 
-    fn to_bytes(&self) -> Result<Vec<u8>, io::Error> {
-        let mut buf = vec![];
-
+    fn write_into<T: Seek + WriteBytesExt + Write>(
+        &self,
+        output: &mut T,
+    ) -> Result<usize, io::Error> {
+        let pos = output.stream_position()?;
         let magic_bytes = [b'C', b'Z', b'0' + self.version as u8, b'\0'];
-        buf.write_all(&magic_bytes)?;
-        buf.write_u32::<LittleEndian>(self.length() as u32)?;
-        buf.write_u16::<LittleEndian>(self.width())?;
-        buf.write_u16::<LittleEndian>(self.height())?;
-        buf.write_u16::<LittleEndian>(self.depth())?;
-        buf.write_u8(self.color_block())?;
 
-        Ok(buf)
+        output.write_all(&magic_bytes)?;
+        output.write_u32::<LittleEndian>(self.length() as u32)?;
+        output.write_u16::<LittleEndian>(self.width())?;
+        output.write_u16::<LittleEndian>(self.height())?;
+        output.write_u16::<LittleEndian>(self.depth())?;
+        output.write_u8(self.color_block())?;
+
+        Ok((output.stream_position()? - pos) as usize)
     }
 }
 
@@ -279,22 +282,25 @@ impl ExtendedHeader {
         })
     }
 
-    pub fn as_bytes(&self) -> Result<Vec<u8>, io::Error> {
-        let mut buf = vec![];
+    pub fn write_into<T: Seek + WriteBytesExt + Write>(
+        &self,
+        output: &mut T
+    ) -> Result<usize, io::Error> {
+        let pos = output.stream_position()?;
 
-        buf.write_all(&self.unknown_1)?;
-        buf.write_u16::<LittleEndian>(self.crop_width)?;
-        buf.write_u16::<LittleEndian>(self.crop_height)?;
-        buf.write_u16::<LittleEndian>(self.bounds_width)?;
-        buf.write_u16::<LittleEndian>(self.bounds_height)?;
+        output.write_all(&self.unknown_1)?;
+        output.write_u16::<LittleEndian>(self.crop_width)?;
+        output.write_u16::<LittleEndian>(self.crop_height)?;
+        output.write_u16::<LittleEndian>(self.bounds_width)?;
+        output.write_u16::<LittleEndian>(self.bounds_height)?;
 
         if self.offset_width.is_some() {
-            buf.write_u16::<LittleEndian>(self.offset_width.unwrap())?;
-            buf.write_u16::<LittleEndian>(self.offset_height.unwrap())?;
-            buf.write_u32::<LittleEndian>(self.unknown_2.unwrap())?;
+            output.write_u16::<LittleEndian>(self.offset_width.unwrap())?;
+            output.write_u16::<LittleEndian>(self.offset_height.unwrap())?;
+            output.write_u32::<LittleEndian>(self.unknown_2.unwrap())?;
         }
 
-        Ok(buf)
+        Ok((output.stream_position()? - pos) as usize)
     }
 }
 
@@ -330,3 +336,13 @@ pub fn apply_palette(
 
     Ok(output_map)
 }
+
+pub fn rgba_to_indexed(input: &[u8], palette: &[[u8; 4]]) -> Result<Vec<u8>, CzError> {
+    let mut output_map = Vec::new();
+
+    for rgba in input.windows(4).step_by(4) {
+        dbg!(rgba);
+    }
+
+    Ok(output_map)
+}
diff --git a/cz/src/dynamic.rs b/cz/src/dynamic.rs
index 094657d..7b9454b 100644
--- a/cz/src/dynamic.rs
+++ b/cz/src/dynamic.rs
@@ -1,11 +1,10 @@
 use std::{
-    io::{BufReader, Read, Seek, SeekFrom},
-    path::Path
+    fs::File, io::{BufReader, Cursor, Read, Seek, SeekFrom, Write}, path::Path
 };
 use byteorder::ReadBytesExt;
 
 use crate::{
-    common::{apply_palette, get_palette, CommonHeader, CzError, CzHeader, CzVersion, ExtendedHeader},
+    common::{apply_palette, get_palette, rgba_to_indexed, CommonHeader, CzError, CzHeader, CzVersion, ExtendedHeader},
     formats::{cz0, cz1, cz2, cz3, cz4},
 };
 
@@ -89,7 +88,32 @@ impl DynamicCz {
     }
 
     pub fn save_as_cz<T: Into<std::path::PathBuf>>(&self, path: T) -> Result<(), CzError> {
-        todo!()
+        let mut out_file = File::create(path.into())?;
+
+        self.header_common.write_into(&mut out_file)?;
+
+        if let Some(ext) = self.header_extended {
+            ext.write_into(&mut out_file)?;
+        }
+
+        let output_bitmap;
+        match &self.palette {
+            Some(pal) if self.header_common.depth() <= 8 => {
+                output_bitmap = rgba_to_indexed(&self.bitmap(), &pal)?
+            },
+            _ => output_bitmap = self.bitmap().clone()
+        }
+
+        match self.header_common.version() {
+            CzVersion::CZ0 => cz0::encode(&mut out_file, &self.bitmap)?,
+            CzVersion::CZ1 => todo!(),
+            CzVersion::CZ2 => todo!(),
+            CzVersion::CZ3 => todo!(),
+            CzVersion::CZ4 => todo!(),
+            CzVersion::CZ5 => todo!(),
+        }
+
+        Ok(())
     }
 
     pub fn header(&self) -> &CommonHeader {
diff --git a/cz/src/formats/cz0.rs b/cz/src/formats/cz0.rs
index f39acb1..779f103 100644
--- a/cz/src/formats/cz0.rs
+++ b/cz/src/formats/cz0.rs
@@ -1,12 +1,23 @@
-use std::io::{Read, Seek};
-use byteorder::ReadBytesExt;
+use std::io::{Read, Write, Seek};
+use byteorder::{ReadBytesExt, WriteBytesExt};
 
 use crate::common::CzError;
 
-pub fn decode<T: Seek + ReadBytesExt + Read>(bytes: &mut T) -> Result<Vec<u8>, CzError> {
+pub fn decode<T: Seek + ReadBytesExt + Read>(
+    input: &mut T
+) -> Result<Vec<u8>, CzError> {
     // Get the rest of the file, which is the bitmap
     let mut bitmap = vec![];
-    bytes.read_to_end(&mut bitmap)?;
+    input.read_to_end(&mut bitmap)?;
 
     Ok(bitmap)
 }
+
+pub fn encode<T: WriteBytesExt + Write>(
+    output: &mut T,
+    bitmap: &[u8]
+) -> Result<(), CzError> {
+    output.write_all(bitmap)?;
+
+    Ok(())
+}
diff --git a/cz/src/formats/cz1.rs b/cz/src/formats/cz1.rs
index 686c268..2265165 100644
--- a/cz/src/formats/cz1.rs
+++ b/cz/src/formats/cz1.rs
@@ -1,5 +1,5 @@
-use byteorder::ReadBytesExt;
-use std::io::{Read, Seek, SeekFrom};
+use byteorder::{ReadBytesExt, WriteBytesExt};
+use std::io::{Read, Seek, SeekFrom, Write};
 
 use crate::common::CzError;
 use crate::compression::{decompress, get_chunk_info};
@@ -14,3 +14,12 @@ pub fn decode<T: Seek + ReadBytesExt + Read>(bytes: &mut T) -> Result<Vec<u8>, C
 
     Ok(bitmap)
 }
+
+pub fn encode<T: WriteBytesExt + Write>(
+    output: &mut T,
+    bitmap: &[u8]
+) -> Result<(), CzError> {
+    output.write_all(bitmap)?;
+
+    Ok(())
+}