@@ -13,6 +13,7 @@ "go.alanpearce.eu/website/internal/storage"
 	"go.alanpearce.eu/x/log"
 
 	"github.com/andybalholm/brotli"
+	"github.com/klauspost/compress/zstd"
 	"gitlab.com/tozd/go/errors"
 )
 
@@ -104,6 +105,15 @@
 	return brotli.NewWriterLevel(f, brotliLevel), nil
 }
 
+func openFileZstd(filename string) (*zstd.Encoder, error) {
+	f, err := openFileWrite(filename + ".zstd")
+	if err != nil {
+		return nil, err
+	}
+
+	return zstd.NewWriter(f)
+}
+
 func multiOpenFile(filename string) (*multibuf.WriteCloser, error) {
 	r, err := openFileWrite(filename)
 	if err != nil {
@@ -117,8 +127,12 @@ br, err := openFileBrotli(filename)
 	if err != nil {
 		return nil, err
 	}
+	zst, err := openFileZstd(filename)
+	if err != nil {
+		return nil, err
+	}
 
-	return multibuf.NewWriteCloser(r, gz, br), nil
+	return multibuf.NewWriteCloser(r, gz, br, zst), nil
 }
 
 func (f *Files) OpenFileAndVariants(filename string) (io.WriteCloser, error) {