diff --git a/client-gui/src/gui_app.rs b/client-gui/src/gui_app.rs
index ae916af..7c5faf4 100644
--- a/client-gui/src/gui_app.rs
+++ b/client-gui/src/gui_app.rs
@@ -5,8 +5,9 @@ use client_network::{
 };
 use crossbeam_channel::{Receiver, Sender};
 use egui::{
-    Align, CentralPanel, CollapsingHeader, Color32, Context, CornerRadius, Frame, Layout, Response,
-    ScrollArea, SidePanel, Stroke, TopBottomPanel, Ui, ViewportCommand,
+    Align, CentralPanel, CollapsingHeader, Color32, Context, CornerRadius, Frame, Layout,
+    ProgressBar, Response, ScrollArea, SidePanel, Stroke, TopBottomPanel, Ui, Vec2,
+    ViewportCommand,
 };
 use std::collections::HashSet;
 use std::{collections::HashMap, fmt::format, io::Seek};
@@ -54,6 +55,13 @@ pub struct P2PClientApp {
 
     current_downloading_file_map: MerkleTree,
     remaining_chunks: HashSet<[u8; 32]>,
+
+    // total number of chunks expected for the current download (set when download starts)
+    current_total_chunks: Option<usize>,
+
+    // number of chunks received so far (count of removed remaining_chunks)
+    current_received_chunks: usize,
+
     root_downloading_file: String,
 }
 
@@ -87,6 +95,8 @@ impl P2PClientApp {
             active_server: "".to_string(),
             shared_tree: generate_base_tree(),
             current_downloading_file_map: current_downloading_file_map,
+            current_total_chunks: None,
+            current_received_chunks: 0,
             root_downloading_file: "".to_string(),
             remaining_chunks: HashSet::new(),
         }
@@ -103,6 +113,14 @@ impl P2PClientApp {
     pub fn clear_success(&mut self) {
         self.success_message = None;
     }
+
+    fn set_current_total_chunks(&mut self, len: Option<usize>) {
+        self.current_total_chunks = len
+    }
+
+    fn set_current_received_chunks(&mut self, arg: usize) {
+        self.current_received_chunks = arg
+    }
 }
 
 // --- eframe::App Trait Implementation ---
@@ -291,6 +309,7 @@ impl eframe::App for P2PClientApp {
                                     true,
                                 ));
                                 self.remaining_chunks.insert(entry);
+                                self.set_current_total_chunks(Some(self.remaining_chunks.len()));
                             }
                             self.remaining_chunks.remove(&hash);
                         }
@@ -299,6 +318,13 @@ impl eframe::App for P2PClientApp {
                         }
                         _ => {}
                     }
+
+                    if let Some(total) = self.current_total_chunks {
+                        // recompute received (safer than incrementing)
+                        let received = total.saturating_sub(self.remaining_chunks.len());
+                        self.current_received_chunks = received;
+                    }
+
                     if self.remaining_chunks.is_empty() {
                         /*let file = OpenOptions::new()
                             .append(true)
@@ -323,6 +349,8 @@ impl eframe::App for P2PClientApp {
                                 }
                             }
                         }*/
+                        self.current_total_chunks = None;
+                        self.current_received_chunks = 0;
                         println!("bigfile téléchargé");
                     }
                 }
@@ -403,26 +431,35 @@ impl eframe::App for P2PClientApp {
         TopBottomPanel::bottom("bottom_panel").show(ctx, |ui| {
             ui.horizontal(|ui| {
                 match self.server_status {
-                    ServerStatus::Loading => {
-                        ui.spinner();
-                    }
-                    ServerStatus::Connected => {
-                        ui.label("Registered but no server peer chosen...");
-                    }
-                    ServerStatus::NotConnected => {
-                        ui.label("No connection..");
-                    }
-                    ServerStatus::ConnectedHandshake => {
-                        let str = format!("📡");
-                        ui.label(str);
-                    }
+                    ServerStatus::Loading => ui.spinner(),
+                    ServerStatus::Connected => ui.label("Registered but no server peer chosen..."),
+                    ServerStatus::NotConnected => ui.label("No connection.."),
+                    ServerStatus::ConnectedHandshake => ui.label("📡"),
+                };
+
+                ui.add_space(8.0); // small gap
+
+                // desired progress bar width
+                let bar_width = 220.0f32;
+                // push it to the right by adding space equal to remaining width minus bar width
+                let push = (ui.available_width() - bar_width).max(0.0);
+                ui.add_space(push);
+
+                if let Some(total) = self.current_total_chunks {
+                    let received = self.current_received_chunks;
+                    let frac = if total == 0 {
+                        1.0
+                    } else {
+                        received as f32 / total as f32
+                    };
+
+                    ui.add(
+                        ProgressBar::new(frac)
+                            .show_percentage()
+                            .animate(true)
+                            .desired_height(10.0),
+                    );
                 }
-                ui.add_space(ui.available_width() - 30.0);
-                // formater mm:ss
-                let secs = self.remaining.as_secs();
-                let minutes = secs / 60;
-                let seconds = secs % 60;
-                ui.label(format!("{:02}:{:02}", minutes, seconds));
             });
         });
 
@@ -685,7 +722,7 @@ impl eframe::App for P2PClientApp {
             ui.separator();
 
             if let Some(active_peer) = &self.active_peer {
-                if let Some(tree) = self.loaded_fs.get(active_peer) {
+                if let Some(tree) = self.loaded_fs.clone().get(active_peer) {
                     ScrollArea::vertical().show(ui, |ui| {
                         // Start drawing the tree from the root hash
                         self.draw_file_tree(ui, tree);
@@ -745,7 +782,7 @@ impl eframe::App for P2PClientApp {
 // --- Helper for Drawing the Recursive File Tree ---
 
 impl P2PClientApp {
-    fn draw_file_tree(&self, ui: &mut Ui, tree: &MerkleTree) {
+    fn draw_file_tree(&mut self, ui: &mut Ui, tree: &MerkleTree) {
         assert!(self.active_peer.is_some());
         assert!(
             self.loaded_fs
@@ -762,7 +799,7 @@ impl P2PClientApp {
     }
 
     fn draw_file_node(
-        &self,
+        &mut self,
         ui: &mut Ui,
         to_draw: NodeHash,
         tree: &MerkleTree,