diff --git a/src/index.ts b/src/index.ts
index a2cf0eb2..7a3d8ae2 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -38,7 +38,7 @@ export function imagetools(userOptions: Partial<PluginOptions> = {}): Plugin {
 
     const directives = [...pluginOptions.customDirectives, ...Object.values(builtinDiretcives)]
 
-    const outputFormats = [...pluginOptions.customOutputFormats, ...Object.values(builtinOutputFormats)]
+    const outputFormats = [...pluginOptions.customOutputFormats, builtinOutputFormats.metadataFormat, builtinOutputFormats.srcsetFormat]
 
     return {
         name: 'imagetools',
@@ -116,7 +116,8 @@ export function imagetools(userOptions: Partial<PluginOptions> = {}): Plugin {
             // go through all output formats to find the one to use
             const output = outputFormats
                 .map(f => f(src, outputMetadatas))
-                .find(res => !!res)
+                .find(res => !!res) || builtinOutputFormats.urlFormat(src, outputMetadatas)
+
 
             // output as JSON or esm depending on the vite config 
             return viteConfig.json?.stringify
diff --git a/src/output.ts b/src/output.ts
index cfeb0fda..d7766a8b 100644
--- a/src/output.ts
+++ b/src/output.ts
@@ -1,3 +1,4 @@
+import { dataToEsm } from "@rollup/pluginutils"
 import { OutputFormat } from "./types"
 
 export const metadataFormat: OutputFormat = (src: URL, outputMetadatas: Record<string, any>[]) => {
@@ -9,7 +10,15 @@ export const metadataFormat: OutputFormat = (src: URL, outputMetadatas: Record<s
 export const srcsetFormat: OutputFormat = (src: URL, outputMetadatas: Record<string, any>[]) => {
     if (!src.searchParams.has('srcset')) return null
 
-    return outputMetadatas.length === 1 ? outputMetadatas[0] : outputMetadatas
+    const sources = outputMetadatas.reduce((prev,meta) => {
+        if(prev) {
+            return  `${prev}, ${meta.src} ${meta.width}w`
+        } else {
+            return  `${meta.src} ${meta.width}w`
+        }
+    }, '')
+
+    return sources
 }
 
 export const urlFormat: OutputFormat = (src: URL, outputMetadatas: Record<string, any>[]) => {