diff --git a/.taurignore b/.taurignore
index 669df74..74cd7c0 100644
--- a/.taurignore
+++ b/.taurignore
@@ -1,2 +1,3 @@
 /*
 !/src-tauri
+!/shared
diff --git a/MoonZoon.toml b/MoonZoon.toml
index 3e0c013..d53ee41 100644
--- a/MoonZoon.toml
+++ b/MoonZoon.toml
@@ -15,8 +15,10 @@ origins = ["*"]
 frontend = [
     "public",
     "frontend/Cargo.toml",
-    "frontend/typescript/bundles",
     "frontend/src",
+    "frontend/typescript/bundles",
+    "shared/Cargo.toml",
+    "shared/src",
 ]
 backend = [
     "backend/Cargo.toml",
diff --git a/shared/src/var_format.rs b/shared/src/var_format.rs
index 5d9eb9f..1185ba4 100644
--- a/shared/src/var_format.rs
+++ b/shared/src/var_format.rs
@@ -3,9 +3,10 @@ pub enum VarFormat {
     ASCII,
     Binary,
     BinaryWithGroups,
-    #[default]
+    // #[default]
     Hexadecimal,
     Octal,
+    #[default]
     Signed,
     Unsigned,
 }
@@ -18,8 +19,8 @@ impl VarFormat {
             VarFormat::BinaryWithGroups => "Bins",
             VarFormat::Hexadecimal => "Hex",
             VarFormat::Octal => "Oct",
-            VarFormat::Signed => "i32",
-            VarFormat::Unsigned => "u32",
+            VarFormat::Signed => "Int",
+            VarFormat::Unsigned => "UInt",
         }
     }
 
@@ -38,17 +39,101 @@ impl VarFormat {
     pub fn format(&self, value: wellen::SignalValue) -> String {
         // @TODO optimize it by not using `.to_string` if possible
         let value = value.to_string();
-        let ones_and_zeros = value
-            .chars()
-            .rev()
-            .map(|char| char.to_digit(2).unwrap())
-            .collect::<Vec<_>>();
-        let mut base = convert_base::Convert::new(2, 16);
-        let output = base.convert::<u32, u32>(&ones_and_zeros);
-        let value: String = output
-            .into_iter()
-            .map(|number| char::from_digit(number, 16).unwrap())
-            .collect();
-        value
+        if value.is_empty() {
+            return value;
+        }
+        match self {
+            VarFormat::ASCII => {
+                // @TODO
+                value
+            },
+            VarFormat::Binary => {
+                value
+            },
+            VarFormat::BinaryWithGroups => {
+                // @TODO
+                value
+            },
+            VarFormat::Hexadecimal => {
+                let ones_and_zeros = value
+                    .chars()
+                    .rev()
+                    .map(|char| char.to_digit(2).unwrap())
+                    .collect::<Vec<_>>();
+                let mut base = convert_base::Convert::new(2, 16);
+                let output = base.convert::<u32, u32>(&ones_and_zeros);
+                let value: String = output
+                    .into_iter()
+                    .rev()
+                    .map(|number| char::from_digit(number, 16).unwrap())
+                    .collect();
+                value
+            },
+            VarFormat::Octal => {
+                let ones_and_zeros = value
+                    .chars()
+                    .rev()
+                    .map(|char| char.to_digit(2).unwrap())
+                    .collect::<Vec<_>>();
+                let mut base = convert_base::Convert::new(2, 8);
+                let output = base.convert::<u32, u32>(&ones_and_zeros);
+                let value: String = output
+                    .into_iter()
+                    .rev()
+                    .map(|number| char::from_digit(number, 8).unwrap())
+                    .collect();
+                value
+            },
+            VarFormat::Signed => {
+                let mut ones_and_zeros = value
+                    .chars()
+                    .rev()
+                    .map(|char| char.to_digit(2).unwrap())
+                    .collect::<Vec<_>>();
+
+                // https://builtin.com/articles/twos-complement
+                let sign = if ones_and_zeros.last().unwrap() == &0 { "" } else { "-" };
+                if sign == "-" {
+                    let mut one_found = false;
+                    for one_or_zero in &mut ones_and_zeros {
+                        if one_found {
+                            *one_or_zero = if one_or_zero == &0 {
+                                1
+                            } else {
+                                0
+                            }
+                        } else if one_or_zero == &1 {
+                            one_found = true;
+                        }
+                    }
+                }
+
+                let mut base = convert_base::Convert::new(2, 10);
+                let output = base.convert::<u32, u32>(&ones_and_zeros);
+                let value_without_sign: String = output
+                    .into_iter()
+                    .rev()
+                    .map(|number| char::from_digit(number, 10).unwrap())
+                    .collect();
+                // @TODO chain `sign` before collecting?
+                let value = sign.to_owned() + &value_without_sign;
+                value
+            },
+            VarFormat::Unsigned => {
+                let ones_and_zeros = value
+                    .chars()
+                    .rev()
+                    .map(|char| char.to_digit(2).unwrap())
+                    .collect::<Vec<_>>();
+                let mut base = convert_base::Convert::new(2, 10);
+                let output = base.convert::<u32, u32>(&ones_and_zeros);
+                let value: String = output
+                    .into_iter()
+                    .rev()
+                    .map(|number| char::from_digit(number, 10).unwrap())
+                    .collect();
+                value
+            },
+        }
     }
 }