diff --git a/src/lib/io.ts b/src/lib/io.ts
index 83b5975..990b127 100644
--- a/src/lib/io.ts
+++ b/src/lib/io.ts
@@ -26,9 +26,13 @@ export async function exportBoard(): Promise<{ success: boolean; error?: string
 			}
 		}
 
-		zip.file('manifest.json', JSON.stringify(exportManifest, null, 2));
+		zip.file('manifest.json', JSON.stringify(exportManifest));
 
-		const blob = await zip.generateAsync({ type: 'blob' });
+		const blob = await zip.generateAsync({
+			type: 'blob',
+			compression: 'DEFLATE',
+			compressionOptions: { level: 9 }
+		});
 		const url = URL.createObjectURL(blob);
 		const a = document.createElement('a');
 		a.href = url;