diff --git a/src/Controller/UploadController.php b/src/Controller/UploadController.php
index 96a897a..885eee4 100644
--- a/src/Controller/UploadController.php
+++ b/src/Controller/UploadController.php
@@ -186,7 +186,7 @@ public function fill( Request $request, Response $response ) {
 		$query = $request->getQueryParams();
 		$iaId = trim( $query['iaId'] ?? '' );
 		$commonsName = $this->commonsClient->normalizePageTitle( $query['commonsName'] ?? '' );
-		$format = $query['format'] ?? 'pdf';
+		$format = $query['format'] ?? 'djvu';
 		$fileSource = $query['fileSource'] ?? 'djvu';
 		// Validate inputs.
 		if ( $iaId === '' || $commonsName === '' ) {
@@ -460,7 +460,7 @@ protected function outputsInitTemplate( array $params, Response $response ) {
 			'iaId' => '',
 			'commonsName' => '',
 			'jobs' => [],
-			'format' => 'pdf',
+			'format' => 'djvu',
 			'wiki_base_url' => $this->config['wiki_base_url'],
 		];
 		$params = array_merge( $defaultParams, $params );