diff --git a/front-public/src/app/pages/upload/upload.component.ts b/front-public/src/app/pages/upload/upload.component.ts
index 3a5752f..97cb840 100644
--- a/front-public/src/app/pages/upload/upload.component.ts
+++ b/front-public/src/app/pages/upload/upload.component.ts
@@ -511,6 +511,7 @@ export class UploadComponent implements OnInit {
   private destroyRef = inject(DestroyRef);
 
   step = signal(1);
+  private readonly maxFileSize = 5 * 1024 * 1024; // 5 Mo
   selectedFiles = signal<File[]>([]);
   detectedType = signal<'ASYNCAPI' | 'OPENAPI' | null>(null);
   detectedMainFilename = signal<string | null>(null);
@@ -717,6 +718,15 @@ export class UploadComponent implements OnInit {
       return;
     }
 
+    const tooLarge = files.find((f) => f.size > this.maxFileSize);
+    if (tooLarge) {
+      this.fileError.set(
+        `Fichier trop volumineux (${tooLarge.name}). Taille max : ${this.maxFileSize / (1024 * 1024)} Mo.`,
+      );
+      this.selectedFiles.set([]);
+      return;
+    }
+
     this.selectedFiles.set(files);
 
     /* Détection côté client du fichier principal (pré-remplissage du type) */