diff --git a/src/components/configuration/partials/wizard/WatermarkPage.tsx b/src/components/configuration/partials/wizard/WatermarkPage.tsx
index 4a5a65eb90..60682ae9e0 100644
--- a/src/components/configuration/partials/wizard/WatermarkPage.tsx
+++ b/src/components/configuration/partials/wizard/WatermarkPage.tsx
@@ -75,7 +75,7 @@ const WatermarkPage = <T extends RequiredFormProps>({
 							</header>
 							<div className="obj-container padded">
 								<FileUpload
-									acceptableTypes="image/*"
+									acceptableTypes="image/gif,image/png,image/jpg,image/jpeg,image/bmp"
 									fileId="watermarkFile"
 									fileName="watermarkFileName"
 									formik={formik}
diff --git a/src/i18n/org/opencastproject/adminui/languages/lang-en_US.json b/src/i18n/org/opencastproject/adminui/languages/lang-en_US.json
index 875c235f63..2149082e5d 100644
--- a/src/i18n/org/opencastproject/adminui/languages/lang-en_US.json
+++ b/src/i18n/org/opencastproject/adminui/languages/lang-en_US.json
@@ -1672,7 +1672,7 @@
 					"BOTTOM_RIGHT": "Bottom right",
 					"UPLOAD": "Upload",
 					"POSITION": "Watermark position and preview",
-					"FILEUPLOAD_DESCRIPTION": "File should have an alpha channel (transparent background). Acceptable file types are: .PNG, .GIF, .SVG, .WEBP",
+					"FILEUPLOAD_DESCRIPTION": "File should have an alpha channel (transparent background). Acceptable file types are: gif, png, jp(e)g, or bmp",
 					"UPLOAD_LABEL": "Upload image",
 					"UPLOAD_BUTTON": "Upload"
 				},