diff --git a/src/ui/widget/color-entry.cpp b/src/ui/widget/color-entry.cpp
index 3b519cc9b35769be0f8bb113b71cc5a6377c1102..e214c865ecf8798f4a2e01a93589e4fb4b33b5ef 100644
--- a/src/ui/widget/color-entry.cpp
+++ b/src/ui/widget/color-entry.cpp
@@ -57,7 +57,14 @@ void ColorEntry::on_changed()
         return;
     }
 
-    auto new_color = Colors::Color::parse(get_text());
+    auto text = get_text();
+    // If it looks like a plain hex string (e.g., "ff00ff") add a '#' 
+    // so both "ff00ff" and "#ff00ff" are accepted.
+    if (looksLikeHex(text)) {
+        text = "#" + text;
+    }
+
+    auto new_color = Colors::Color::parse(text);
 
     _updatingrgba = true;
     if (new_color) {
@@ -109,6 +116,26 @@ void ColorEntry::_onColorChanged()
     }
 }
 
+// Checks if a text looks like a hex color code
+// for example, returns true for "fff" or "ff00ff",
+// but false for actual hex codes (like "#fff" or "#ff00ff")
+// or any invalid hex strings.
+bool ColorEntry::looksLikeHex(const Glib::ustring &text) const
+{
+    if (text.empty() || text[0] == '#') {
+        return false;
+    }
+
+    auto len = text.size();
+    if (len != 3 && len != 4 && len != 6 && len != 8) {
+        return false;
+    }
+
+    return std::all_of(text.begin(), text.end(), [](unsigned char c) {
+        return std::isxdigit(c);
+    });
+}
+
 } // namespace
 
 /*
diff --git a/src/ui/widget/color-entry.h b/src/ui/widget/color-entry.h
index 9dbb82e9ddaebd14fc9a4b1c49f4555e65fd477f..72afbb2fef8638bb20ec324f57b9c907caceff06 100644
--- a/src/ui/widget/color-entry.h
+++ b/src/ui/widget/color-entry.h
@@ -32,6 +32,7 @@ protected:
 private:
     void _onColorChanged();
     void _inputCheck(guint pos, const gchar * /*chars*/, guint /*n_chars*/);
+    bool looksLikeHex(const Glib::ustring &text) const;
 
     std::shared_ptr<Colors::ColorSet> _colors;
     bool _updating;