diff --git a/README.md b/README.md
index 78953341..ed02afdf 100755
--- a/README.md
+++ b/README.md
@@ -192,6 +192,8 @@ This package also ships a pure WebAssembly artifact built with `wasm-bindgen` to
     const resvgJS = new resvg.Resvg(svg, opts)
     const pngData = resvgJS.render(svg, opts) // Output PNG data, Uint8Array
     const pngBuffer = pngData.asPng()
+    pngData.free() // Free memory
+    resvgJS.free()
     const svgURL = URL.createObjectURL(new Blob([pngData], { type: 'image/png' }))
     document.getElementById('output').src = svgURL
   })()
diff --git a/wasm/index.html b/wasm/index.html
index 35471f86..d519f4e5 100644
--- a/wasm/index.html
+++ b/wasm/index.html
@@ -320,6 +320,9 @@
         const pngData = resvgJS.render()
         const pngBuffer = pngData.asPng()
 
+        pngData.free()
+        resvgJS.free()
+
         document.querySelector('#output img').src = URL.createObjectURL(
           new Blob([pngBuffer], { type: 'image/png' })
         )