diff --git a/frontend/src/pages/GameDetail.svelte b/frontend/src/pages/GameDetail.svelte
index 31fde93..e6c6f83 100644
--- a/frontend/src/pages/GameDetail.svelte
+++ b/frontend/src/pages/GameDetail.svelte
@@ -243,6 +243,13 @@
                 🪟 Requires Windows 3.1 — may not work in browser
               {:else}
                 💾 DOS
+                {#if game.bundle_size}
+                  <span class="size-badge">· {game.bundle_size >= 1073741824
+                    ? (game.bundle_size / 1073741824).toFixed(1) + ' GB'
+                    : game.bundle_size >= 1048576
+                      ? Math.round(game.bundle_size / 1048576) + ' MB'
+                      : Math.round(game.bundle_size / 1024) + ' KB'}</span>
+                {/if}
               {/if}
             </div>
           {/if}
@@ -410,6 +417,10 @@
     background: #1a3a5c;
     color: #6ab0ff;
   }
+  .size-badge {
+    font-weight: 400;
+    opacity: 0.8;
+  }
   .meta { display: flex; gap: 8px; margin-bottom: 8px; }
   .meta-item { background: var(--surface-hover); color: var(--phosphor-dim); padding: 4px 12px; border-radius: 12px; font-size: 0.85rem; }
   .meta-link { cursor: pointer; text-decoration: none; transition: all 0.15s; display: inline-block; }
diff --git a/frontend/src/pages/Library.svelte b/frontend/src/pages/Library.svelte
index 6b58cce..73b68a8 100644
--- a/frontend/src/pages/Library.svelte
+++ b/frontend/src/pages/Library.svelte
@@ -28,9 +28,14 @@
 
   let fileInput;
 
-  // When header upload button is clicked, trigger the hidden file input
+  // When header upload button is clicked, trigger the hidden file input.
+  // Uses a previous-value guard to prevent re-firing on component remount.
+  let prevUploadTrigger = $state(uploadTriggered);
   $effect(() => {
-    if (uploadTriggered > 0) fileInput?.click();
+    if (uploadTriggered > 0 && uploadTriggered !== prevUploadTrigger) {
+      prevUploadTrigger = uploadTriggered;
+      fileInput?.click();
+    }
   });
 
   // Derive filter options from the loaded games
diff --git a/src/main/java/com/dostalgia/Game.java b/src/main/java/com/dostalgia/Game.java
index 8f14843..b4709ac 100644
--- a/src/main/java/com/dostalgia/Game.java
+++ b/src/main/java/com/dostalgia/Game.java
@@ -23,6 +23,9 @@ public class Game {
 
     private String setupExe;    // relative path to SETUP.EXE (null if none)
 
+    /** Game bundle file size in bytes. Populated dynamically at load time (not persisted). */
+    private Long bundleSize;
+
     /** Currently selected main executable (relative path inside the bundle, e.g. "FALLOUT.EXE" or "FALLOUT/FALLOUT.EXE"). */
     private String executable;
 
@@ -91,6 +94,9 @@ public class Game {
     public String getSetupExe() { return setupExe; }
     public void setSetupExe(String setupExe) { this.setupExe = setupExe; }
 
+    public Long getBundleSize() { return bundleSize; }
+    public void setBundleSize(Long bundleSize) { this.bundleSize = bundleSize; }
+
     public String getExecutable() { return executable; }
     public void setExecutable(String executable) { this.executable = executable; }
 
diff --git a/src/main/java/com/dostalgia/GameService.java b/src/main/java/com/dostalgia/GameService.java
index 01c6c48..ddfe632 100644
--- a/src/main/java/com/dostalgia/GameService.java
+++ b/src/main/java/com/dostalgia/GameService.java
@@ -67,8 +67,14 @@ public class GameService {
             Files.exists(gameDir(id).resolve("cover.png")) ||
             Files.exists(gameDir(id).resolve("cover.webp"))
         );
+        // Detect bundle size
+        try {
+            Path bundlePath = gamesDir.resolve(game.getBundleFile());
+            if (bundlePath != null && Files.exists(bundlePath)) {
+                game.setBundleSize(Files.size(bundlePath));
+            }
+        } catch (IOException ignored) {}
         return game;
-    }
 
     /** Save game metadata to disk. */
     public void save(Game game) throws IOException {