diff --git a/Cargo.lock b/Cargo.lock
index 8a4cd30..3702093 100644
--- a/Cargo.lock
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+ "lazy_static",
+ "libc",
+ "log",
+ "mio",
+ "ndk",
+ "ndk-glue",
+ "ndk-sys",
+ "objc",
+ "parking_lot",
+ "percent-encoding",
+ "raw-window-handle",
+ "smithay-client-toolkit",
+ "wasm-bindgen",
+ "wayland-client",
+ "wayland-protocols",
+ "web-sys",
+ "winapi",
+ "x11-dl",
+]
+
 [[package]]
 name = "winreg"
 version = "0.10.1"
@@ -320,3 +2018,49 @@ checksum = "80d0f4e272c85def139476380b12f9ac60926689dd2e01d4923222f40580869d"
 dependencies = [
  "winapi",
 ]
+
+[[package]]
+name = "x11-clipboard"
+version = "0.5.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "473068b7b80ac86a18328824f1054e5e007898c47b5bbc281bd7abe32bc3653c"
+dependencies = [
+ "xcb",
+]
+
+[[package]]
+name = "x11-dl"
+version = "2.19.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ea26926b4ce81a6f5d9d0f3a0bc401e5a37c6ae14a1bfaa8ff6099ca80038c59"
+dependencies = [
+ "lazy_static",
+ "libc",
+ "pkg-config",
+]
+
+[[package]]
+name = "xcb"
+version = "0.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "771e2b996df720cd1c6dd9ff90f62d91698fd3610cc078388d0564bdd6622a9c"
+dependencies = [
+ "libc",
+ "log",
+ "quick-xml",
+]
+
+[[package]]
+name = "xcursor"
+version = "0.3.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "463705a63313cd4301184381c5e8042f0a7e9b4bb63653f216311d4ae74690b7"
+dependencies = [
+ "nom",
+]
+
+[[package]]
+name = "xml-rs"
+version = "0.8.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d2d7d3948613f75c98fd9328cfdcc45acc4d360655289d0a7d4ec931392200a3"
diff --git a/gui/Cargo.toml b/gui/Cargo.toml
index 1a15883..933e025 100644
--- a/gui/Cargo.toml
+++ b/gui/Cargo.toml
@@ -1,8 +1,13 @@
 [package]
+edition = "2021"
 name = "gui"
 version = "0.1.0"
-edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+cli = {path = "../cli"}
+core = {path = "../core"}
+eframe = "0.16.0"
+image = "0.23.14"
+rfd = "0.6.4"
diff --git a/gui/src/lib.rs b/gui/src/lib.rs
new file mode 100644
index 0000000..f20f90d
--- /dev/null
+++ b/gui/src/lib.rs
@@ -0,0 +1,59 @@
+use eframe::egui::{Separator, Ui};
+use eframe::epi::Image;
+use eframe::{egui, epi};
+
+const PADDING: f32 = 5.0;
+
+pub fn render_header(ui: &mut Ui) {
+    ui.vertical_centered(|ui| {
+        ui.heading("RDR2Converter");
+    });
+    ui.add_space(PADDING);
+    let sep = Separator::default().spacing(20.);
+    ui.add(sep);
+}
+
+pub fn decode_image(buffer: &[u8]) -> Option<epi::Image> {
+    use image::GenericImageView;
+    let image = image::load_from_memory(buffer).ok()?;
+    let image_buffer = image.to_rgba8();
+    let size = [image.width() as usize, image.height() as usize];
+    let pixels = image_buffer.into_vec();
+    Some(epi::Image::from_rgba_unmultiplied(size, &pixels))
+}
+
+pub fn render_image(
+    ui: &mut egui::Ui,
+    frame: &epi::Frame,
+    tex_mngr: &mut TextureManager,
+    image: Option<epi::Image>,
+) {
+    egui::ScrollArea::vertical()
+        .auto_shrink([false; 2])
+        .show(ui, |ui| {
+            if let Some(image) = image {
+                if let Some(texture_id) = tex_mngr.texture(frame, &image) {
+                    let mut size = egui::Vec2::new(image.size[0] as f32, image.size[1] as f32);
+                    size *= (ui.available_width() / size.x).min(1.0);
+                    ui.image(texture_id, size);
+                } else {
+                    ui.monospace("ERROR");
+                }
+            }
+        })
+}
+
+#[derive(Default)]
+pub struct TextureManager {
+    texture_id: Option<egui::TextureId>,
+}
+
+impl TextureManager {
+    pub fn texture(&mut self, frame: &epi::Frame, image: &Image) -> Option<egui::TextureId> {
+        if let Some(texture_id) = self.texture_id.take() {
+            frame.free_texture(texture_id);
+        }
+        self.texture_id = Some(frame.alloc_texture(image.clone()));
+        self.texture_id
+    }
+}
diff --git a/gui/src/main.rs b/gui/src/main.rs
index e7a11a9..5e56977 100644
--- a/gui/src/main.rs
+++ b/gui/src/main.rs
@@ -1,3 +1,49 @@
-fn main() {
-    println!("Hello, world!");
+#![cfg_attr(not(debug_assertions), windows_subsystem = "windows")] // hide console window on Windows in release
+
+use core::buffer;
+use eframe::{
+    egui::{CentralPanel, Vec2},
+    epi::App,
+    run_native, NativeOptions,
+};
+use gui::TextureManager;
+use std::path::PathBuf;
+
+#[derive(Default)]
+struct RDR2Converter {
+    pub tex_mngr: TextureManager,
+    picked_path: Option<PathBuf>,
+}
+
+impl App for RDR2Converter {
+    fn update(&mut self, ctx: &eframe::egui::CtxRef, frame: &eframe::epi::Frame) {
+        CentralPanel::default().show(ctx, |ui| {
+            gui::render_header(ui);
+
+            if ui.button("Open file...").clicked() {
+                if let Some(path) = rfd::FileDialog::new().pick_file() {
+                    self.picked_path = Some(path);
+                }
+            }
+
+            // TODO: use threads and channels
+            if let Some(picked_path) = &self.picked_path {
+                let buf = buffer::read_file(&picked_path).unwrap();
+                let pic = buffer::parse_buf(&buf, b"JPEG", b"JSON", 12);
+                let image = gui::decode_image(&pic);
+                gui::render_image(ui, frame, &mut self.tex_mngr, image);
+            }
+        });
+    }
+
+    fn name(&self) -> &str {
+        "RDR2Converter"
+    }
+}
+
+fn main() {
+    let app = RDR2Converter::default();
+    let mut win_option = NativeOptions::default();
+    win_option.initial_window_size = Some(Vec2::new(540., 960.));
+    run_native(Box::new(app), win_option);
 }