diff --git a/src/App.svelte b/src/App.svelte
index c86d84d..0c85d92 100644
--- a/src/App.svelte
+++ b/src/App.svelte
@@ -27,6 +27,22 @@
     return [c || 0, m || 0, y || 0, Math.round(k * 100)];
   }
 
+  function stringToRgb(input: string): number[] | undefined {
+    if (input.startsWith("#")) {
+      let parts = input.match(/([0-f0-F]){2}/g);
+      if (!parts || parts.length != 3) return undefined;
+      return parts.map((e) => parseInt(e, 16));
+    } else if (input.startsWith("rgb(")) {
+      let parts = input.match(/[0-9]{1,3}/g);
+      if (!parts || parts.length != 3) return undefined;
+      return parts.map((e) => parseInt(e));
+    } else if (input.startsWith("cmyk(")) {
+      let parts = input.match(/[0-9]{1,3}/g);
+      if (!parts || parts.length != 4) return undefined;
+      return cmykToRgb(parts.map((e) => parseInt(e)));
+    }
+  }
+
   enum Mode {
     Rgb,
     Cmyk,
@@ -130,6 +146,17 @@
           }
         }}
       />
+      <Button
+        text="Input custom color"
+        emoji="🎨"
+        callback={() => {
+          let colorString = prompt(
+            "Color: (eg. `#00ff00` or `rgb(0, 255, 0)` or `cmyk(100, 0, 100, 0)`)"
+          );
+          if (!colorString) return;
+          targetColor = stringToRgb(colorString) || [0, 0, 0];
+        }}
+      />
       <Button
         text="Change input method"
         emoji="🔀"