diff --git a/demo_markdown/docs/input/mod.md b/demo_markdown/docs/input/mod.md
index 285ecbf..9196fd5 100644
--- a/demo_markdown/docs/input/mod.md
+++ b/demo_markdown/docs/input/mod.md
@@ -102,6 +102,25 @@ view! {
 }
 ```
 
+### Formatter
+
+```rust demo
+let value = create_rw_signal(String::from("loren_ipsun"));
+
+let formatter = Callback::<String, String>::new(move |v: String| {
+    v.replace("_", " ")
+});
+
+let parser = Callback::<String, String>::new(move |v: String| {
+    v.replace(" ", "_")
+});
+
+view! {
+    <Input value parser formatter />
+    <p>"Underlying value: "{ value }</p>
+}
+```
+
 ### Input Props
 
 | Name | Type | Default | Description |
@@ -116,6 +135,8 @@ view! {
 | on_focus | `Option<Callback<ev::FocusEvent>>` | `None` | Callback triggered when the input is focussed on. |
 | on_blur | `Option<Callback<ev::FocusEvent>>` | `None` | Callback triggered when the input is blurred. |
 | attr: | `Vec<(&'static str, Attribute)>` | `Default::default()` | The dom attrs of the input element inside the component. |
+| parser | `OptionalProp<Callback<String, String>>` | `Default::default()` | Modifies the user input before assigning it to the value |
+| formatter | `OptionalProp<Callback<String, String>>` | `Default::default()` | Formats the value to be shown to the user |
 
 ### Input Slots
 
diff --git a/demo_markdown/docs/input_number/mod.md b/demo_markdown/docs/input_number/mod.md
index c50a21c..8305d8c 100644
--- a/demo_markdown/docs/input_number/mod.md
+++ b/demo_markdown/docs/input_number/mod.md
@@ -42,6 +42,49 @@ view! {
 }
 ```
 
+### Formatter
+
+```rust demo
+let value = create_rw_signal(0.0);
+let value_2 = create_rw_signal(0.0);
+
+let formatter = Callback::<f64, String>::new(move |v: f64| {
+    let v = v.to_string();
+    let dot_pos = v.chars().position(|c| c == '.').unwrap_or_else(|| v.chars().count());
+    let mut int: String = v.chars().take(dot_pos).collect();
+
+    let sign: String = if v.chars().take(1).collect::<String>() == String::from("-") { 
+        int = int.chars().skip(1).collect();
+        String::from("-")
+    } else { 
+        String::from("") 
+    };
+
+    let dec: String = v.chars().skip(dot_pos + 1).take(2).collect();
+
+    let int = int
+        .as_bytes()
+        .rchunks(3)
+        .rev()
+        .map(std::str::from_utf8)
+        .collect::<Result<Vec<&str>, _>>()
+        .unwrap()
+        .join(".");
+    format!("{}{},{:0<2}", sign, int, dec)
+});
+
+let parser = Callback::<String, f64>::new(move |v: String| {
+    let comma_pos = v.chars().position(|c| c == ',').unwrap_or_else(|| v.chars().count());
+    let int_part = v.chars().take(comma_pos).filter(|a| a.is_digit(10)).collect::<String>();
+    let dec_part = v.chars().skip(comma_pos + 1).take(2).filter(|a| a.is_digit(10)).collect::<String>();
+    format!("{:0<1}.{:0<2}", int_part, dec_part).parse::<f64>().unwrap_or_default()
+});
+
+view! {
+    <InputNumber value parser formatter step=1.0 />
+    <p>"Underlying value: "{ value }</p>
+}
+```
 ### InputNumber Props
 
 | Name | Type | Default | Description |
@@ -55,6 +98,8 @@ view! {
 | disabled | `MaybeSignal<bool>` | `false` | Whether the input is disabled. |
 | invalid | `MaybeSignal<bool>` | `false` | Whether the input is invalid. |
 | attr: | `Vec<(&'static str, Attribute)>` | `Default::default()` | The dom attrs of the input element inside the component. |
+| parser | `OptionalProp<Callback<String, T>>` | `Default::default()` | Modifies the user input before assigning it to the value |
+| formatter | `OptionalProp<Callback<T, String>>` | `Default::default()` | Formats the value to be shown to the user |
 
 #### T impl
 
diff --git a/thaw/src/input/mod.rs b/thaw/src/input/mod.rs
index 0403f39..741a9b4 100644
--- a/thaw/src/input/mod.rs
+++ b/thaw/src/input/mod.rs
@@ -53,20 +53,36 @@ pub fn Input(
     #[prop(optional)] comp_ref: ComponentRef<InputRef>,
     #[prop(optional, into)] class: OptionalProp<MaybeSignal<String>>,
     #[prop(attrs)] attrs: Vec<(&'static str, Attribute)>,
+    #[prop(optional, into)] parser: OptionalProp<Callback<String, String>>,
+    #[prop(optional, into)] formatter: OptionalProp<Callback<String, String>>,
 ) -> impl IntoView {
     let theme = use_theme(Theme::light);
     mount_style("input", include_str!("./input.css"));
 
     let value_trigger = create_trigger();
     let on_input = move |ev| {
-        let input_value = event_target_value(&ev);
-        if let Some(allow_value) = allow_value.as_ref() {
-            if !allow_value.call(input_value.clone()) {
-                value_trigger.notify();
-                return;
+        if parser.is_none() {
+            let input_value = event_target_value(&ev);
+            if let Some(allow_value) = allow_value.as_ref() {
+                if !allow_value.call(input_value.clone()) {
+                    value_trigger.notify();
+                    return;
+                }
             }
+            value.set(input_value);
+        }
+    };
+    let on_change = move |ev| {
+        if let Some(parser) = parser.or_else(|| None) {
+            let parsed_input_value = parser.call(event_target_value(&ev));
+            if let Some(allow_value) = allow_value.as_ref() {
+                if !allow_value.call(parsed_input_value.clone()) {
+                    value_trigger.notify();
+                    return;
+                }
+            }
+            value.set(parsed_input_value);
         }
-        value.set(input_value);
     };
     let is_focus = create_rw_signal(false);
     let on_internal_focus = move |ev| {
@@ -186,9 +202,10 @@ pub fn Input(
                 value=input_value
                 prop:value=move || {
                     value_trigger.track();
-                    value.get()
+                    formatter.map_or_else(|| value.get(), |c| c.call(value.get()))
                 }
 
+                on:change=on_change
                 on:input=on_input
                 on:focus=on_internal_focus
                 on:blur=on_internal_blur
diff --git a/thaw/src/input_number/mod.rs b/thaw/src/input_number/mod.rs
index 8999530..4747586 100644
--- a/thaw/src/input_number/mod.rs
+++ b/thaw/src/input_number/mod.rs
@@ -14,6 +14,8 @@ pub fn InputNumber<T>(
     #[prop(optional, into)] invalid: MaybeSignal<bool>,
     #[prop(optional, into)] class: OptionalProp<MaybeSignal<String>>,
     #[prop(optional)] comp_ref: ComponentRef<InputNumberRef>,
+    #[prop(optional, into)] parser: OptionalProp<Callback<String, T>>,
+    #[prop(optional, into)] formatter: OptionalProp<Callback<T, String>>,
     #[prop(attrs)] attrs: Vec<(&'static str, Attribute)>,
     #[prop(default = MaybeSignal::Static(T::min_value()), into)] min: MaybeSignal<T>,
     #[prop(default = MaybeSignal::Static(T::max_value()), into)] max: MaybeSignal<T>,
@@ -77,6 +79,13 @@ where
         invalid.get() || value < min.get() || value > max.get()
     });
 
+    let parser = parser.map(|parser| {
+        Callback::new(move |v| parser.call(v).to_string())
+    });
+    let formatter = formatter.map(|formatter| {
+        Callback::new(move |v: String| formatter.call(v.parse::<T>().unwrap_or_default()))
+    });
+
     view! {
         <Input
             attrs
@@ -88,6 +97,8 @@ where
             invalid
             comp_ref=input_ref
             on_blur=set_within_range
+            parser
+            formatter
         >
             <InputSuffix slot>
                 <Button disabled=minus_disabled variant=ButtonVariant::Link on_click=sub>
diff --git a/thaw_utils/src/optional_prop.rs b/thaw_utils/src/optional_prop.rs
index eca37c6..4144f19 100644
--- a/thaw_utils/src/optional_prop.rs
+++ b/thaw_utils/src/optional_prop.rs
@@ -96,6 +96,8 @@ impl<T> From<Option<T>> for OptionalProp<T> {
     }
 }
 
+impl<T: Copy> Copy for OptionalProp<T> {}
+
 #[cfg(test)]
 mod test {
     use super::OptionalProp;