diff --git a/board-builder-gui/src/main.rs b/board-builder-gui/src/main.rs
index e2c9f3b..3ee0e3a 100644
--- a/board-builder-gui/src/main.rs
+++ b/board-builder-gui/src/main.rs
@@ -7,7 +7,8 @@ use image::DynamicImage;
 
 use rfd::FileDialog;
 
-use board_builder::{ Board, Node, CoordTransformer, read_board_from_file, write_board_to_file };
+use board_builder::{ Board, Node, CoordTransformer };
+use board_builder::io::{ read_board_from_file, write_board_to_file };
 
 use std::path::Path;
 use std::collections::HashSet;
diff --git a/src/io.rs b/src/io.rs
new file mode 100644
index 0000000..90a49ff
--- /dev/null
+++ b/src/io.rs
@@ -0,0 +1,56 @@
+use crate::Board;
+
+use std::io;
+use std::io::{ Write, Read, Cursor };
+use std::fs::File;
+use std::path::Path;
+
+use image::io::Reader as ImageReader;
+use image::DynamicImage;
+
+pub fn write_board_to_file(board: &Board, image: Option<&DynamicImage>, path: &Path) -> io::Result<()> {
+    let file = File::create(path)?;
+    let mut ar = zip::ZipWriter::new(file);
+    let options = zip::write::FileOptions::default();
+
+    ar.start_file("graph.json", options)?;
+    ar.write_all(&serde_json::to_vec(board)?)?;
+    if let Some(image) = image {
+        ar.start_file("image.png", options)?;
+        let data = encode_png(image);
+        ar.write_all(&data)?;
+        ar.flush()?;
+    }
+    ar.finish()?;
+    Ok(())
+}
+
+pub fn read_board_from_file(path: &Path) -> io::Result<(Board, Option<DynamicImage>)> {
+    let file = File::open(path)?;
+    let mut ar = zip::ZipArchive::new(file)?;
+
+    let json_file = ar.by_name("graph.json")?;
+    let board = serde_json::from_reader(json_file)?;
+    let image = ar.by_name("image.png").ok();
+    if image.is_none() {
+        return Ok((board, None))
+    }
+    let mut image_file = image.unwrap();
+    let mut buf = Vec::new();
+    image_file.read_to_end(&mut buf)?;
+    let image = decode_png(&buf);
+    Ok((board, Some(image)))
+}
+
+pub fn encode_png(image: &DynamicImage) -> Vec<u8> {
+    let mut cursor = Cursor::new(Vec::new());
+    image.write_to(&mut cursor, image::ImageOutputFormat::Png).unwrap();
+    cursor.into_inner()
+}
+
+pub fn decode_png(buf: &[u8]) -> DynamicImage {
+    let cursor = Cursor::new(buf);
+    let mut reader = ImageReader::new(cursor);
+    reader.set_format(image::ImageFormat::Png);
+    reader.decode().unwrap()
+}
diff --git a/src/lib.rs b/src/lib.rs
index 742e70a..181db74 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,3 +1,5 @@
+pub mod io;
+
 use serde::{ Serialize, Deserialize };
 use std::collections::{ HashMap, HashSet };
 
@@ -13,6 +15,7 @@ impl Default for Config {
         }
     }
 }
+
 #[derive(Serialize, Deserialize, Debug, Default, Clone)]
 #[serde(default)]
 pub struct Node {
@@ -23,7 +26,6 @@ pub struct Node {
     pub edges: HashSet<usize>,
     pub labels: HashMap<String, String>,
 }
-
 impl Node {
     pub fn should_wrap_horizontal(&self, other: &Node) -> bool {
         let mut xs = [self.x, other.x];
@@ -120,61 +122,6 @@ fn dist_sq((x0, y0): (f32, f32), (x1, y1): (f32, f32)) -> f32 {
     (x1 - x0) * (x1 - x0) + (y1 - y0) * (y1 - y0)
 }
 
-use std::io;
-use std::io::{ Write, Read, Cursor };
-use std::fs::File;
-use std::path::Path;
-
-use image::io::Reader as ImageReader;
-use image::{ DynamicImage };
-
-pub fn write_board_to_file(board: &Board, image: Option<&DynamicImage>, path: &Path) -> io::Result<()> {
-    let file = File::create(path)?;
-    let mut ar = zip::ZipWriter::new(file);
-    let options = zip::write::FileOptions::default();
-
-    ar.start_file("graph.json", options)?;
-    ar.write_all(&serde_json::to_vec(board)?)?;
-    if let Some(image) = image {
-        ar.start_file("image.png", options)?;
-        let data = encode_png(image);
-        ar.write_all(&data)?;
-        ar.flush()?;
-    }
-    ar.finish()?;
-    Ok(())
-}
-
-pub fn read_board_from_file(path: &Path) -> io::Result<(Board, Option<DynamicImage>)> {
-    let file = File::open(path)?;
-    let mut ar = zip::ZipArchive::new(file)?;
-
-    let json_file = ar.by_name("graph.json")?;
-    let board = serde_json::from_reader(json_file)?;
-    let image = ar.by_name("image.png").ok();
-    if image.is_none() {
-        return Ok((board, None))
-    }
-    let mut image_file = image.unwrap();
-    let mut buf = Vec::new();
-    image_file.read_to_end(&mut buf)?;
-    let image = decode_png(&buf);
-    Ok((board, Some(image)))
-}
-
-pub fn encode_png(image: &DynamicImage) -> Vec<u8> {
-    let mut cursor = Cursor::new(Vec::new());
-    image.write_to(&mut cursor, image::ImageOutputFormat::Png).unwrap();
-    cursor.into_inner()
-}
-
-pub fn decode_png(buf: &[u8]) -> DynamicImage {
-    let cursor = Cursor::new(buf);
-    let mut reader = ImageReader::new(cursor);
-    reader.set_format(image::ImageFormat::Png);
-    reader.decode().unwrap()
-}
-
 fn lerp(v0: f32, v1: f32, t: f32) -> f32 {
     v0 + t * (v1 - v0)
 }