diff --git a/installer.nsi b/installer.nsi
index 31c4d0d..fffd9c0 100644
--- a/installer.nsi
+++ b/installer.nsi
@@ -2,6 +2,7 @@
 
 !define APP_NAME "Cert Tools"
 !define APP_EXE "cert-tools-ui.exe"
+!define MUI_ICON "resources\icon.ico"
 !define UNINSTALLER_EXE "uninstaller.exe"
 !define INSTALL_DIR "$LocalAppData\Programs\${APP_NAME}"
 
diff --git a/resources/icon.ico b/resources/icon.ico
new file mode 100644
index 0000000..624634b
Binary files /dev/null and b/resources/icon.ico differ
diff --git a/src/lib.rs b/src/lib.rs
index 3381309..d9e254f 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -16,18 +16,19 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
-use std::cmp::Ordering;
+
+use itertools::Itertools;
 use openssl::asn1::Asn1Time;
 use openssl::hash::MessageDigest;
 use openssl::nid::Nid;
 use openssl::pkey::{PKey, PKeyRef, Public};
 use openssl::x509::X509;
+use std::cmp::Ordering;
 use std::fmt::Display;
 use std::fs;
 use std::hash::{Hash, Hasher};
 use std::path::Path;
 use std::time::{SystemTime, UNIX_EPOCH};
-use itertools::Itertools;
 
 pub fn hex_encode<T: AsRef<[u8]>>(s: T) -> String {
     s.as_ref()
diff --git a/ui/Cargo.toml b/ui/Cargo.toml
index 3b53ce1..7bd2235 100644
--- a/ui/Cargo.toml
+++ b/ui/Cargo.toml
@@ -5,6 +5,10 @@ edition = "2021"
 
 [dependencies]
 cert-tools = { path = "..", version = "*" }
-iced = { version = "0.13", features = ["wgpu", "tiny-skia", "tokio", "web-colors"], default-features = false }
+iced = { version = "0.13", features = ["wgpu", "tiny-skia", "tokio", "web-colors", "image"], default-features = false }
 rfd = "0.15"
-itertools = "0.14"
\ No newline at end of file
+itertools = "0.14"
+image = {version = "0.25", features = ["ico"], default-features = false }
+
+[build-dependencies]
+winresource = "0.1"
\ No newline at end of file
diff --git a/ui/build.rs b/ui/build.rs
new file mode 100644
index 0000000..bd85825
--- /dev/null
+++ b/ui/build.rs
@@ -0,0 +1,26 @@
+/*
+ * This file is part of cert-tools
+ *
+ * Copyright (C) 2025 the original author or authors.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+fn main() {
+    if std::env::var_os("CARGO_CFG_WINDOWS").is_some() {
+        let mut res = winresource::WindowsResource::new();
+        res.set_icon("../resources/icon.ico");
+        res.compile().unwrap();
+    }
+}
diff --git a/ui/src/main.rs b/ui/src/main.rs
index d8545dc..4514c91 100644
--- a/ui/src/main.rs
+++ b/ui/src/main.rs
@@ -1,3 +1,22 @@
+/*
+ * This file is part of cert-tools
+ *
+ * Copyright (C) 2025 the original author or authors.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 #![windows_subsystem = "windows"]
 
 use cert_tools::{Chain, PrivateKey};
@@ -7,9 +26,10 @@ use iced::widget::{
     self, button, column, container, horizontal_rule, horizontal_space, row, text, text_editor,
     text_input, Container, Scrollable,
 };
+use iced::window::icon;
 use iced::{
-    alignment, application, clipboard, color, Background, Border, Color, Element, Font, Length,
-    Pixels, Settings, Size, Task,
+    alignment, application, clipboard, color, window, Background, Border, Color, Element, Font,
+    Length, Pixels, Settings, Size, Task,
 };
 use std::fs;
 use std::path::PathBuf;
@@ -21,6 +41,13 @@ fn main() -> iced::Result {
             default_text_size: Pixels::from(13),
             ..Settings::default()
         })
+        .window(window::Settings {
+            icon: match image::load_from_memory(include_bytes!("../../resources/icon.ico")) {
+                Ok(image) => icon::from_rgba(image.as_bytes().to_vec(), 128, 128).ok(),
+                _ => None,
+            },
+            ..window::Settings::default()
+        })
         .resizable(false)
         .window_size(Size::new(1020.0, 800.0))
         .run_with(Ui::new)