diff --git a/main/commands/all/convert/protobuf.go b/main/commands/all/convert/protobuf.go
index c77df963..74272c57 100644
--- a/main/commands/all/convert/protobuf.go
+++ b/main/commands/all/convert/protobuf.go
@@ -3,6 +3,7 @@ package convert
 import (
 	"fmt"
 	"os"
+	"strings"
 
 	"github.com/xtls/xray-core/common/cmdarg"
 	creflect "github.com/xtls/xray-core/common/reflect"
@@ -14,15 +15,18 @@ import (
 
 var cmdProtobuf = &base.Command{
 	CustomFlags: true,
-	UsageLine:   "{{.Exec}} convert pb [-debug] [-type] [json file] [json file] ...",
+	UsageLine:   "{{.Exec}} convert pb [-outpbfile file] [-debug] [-type] [json file] [json file] ...",
 	Short:       "Convert multiple json configs to protobuf",
 	Long: `
-Convert multiple json configs to protobuf.
+Convert multiple configs to ProtoBuf. JSON, YAML and TOML can be used.
 
 Arguments:
 
+	-o file, -outpbfile file
+		Write the ProtoBuf output (eg. mix.pb) to specified file location.
+
 	-d, -debug
-		Show mix.pb as json.
+		Show mix.pb as JSON format.
 		FOR DEBUGGING ONLY!
 		DO NOT PASS THIS OUTPUT TO XRAY-CORE!
 
@@ -31,16 +35,20 @@ Arguments:
 
 Examples:
 
-    {{.Exec}} convert pb config.json c1.json c2.json c3.json > mix.pb
+    {{.Exec}} convert pb -outpbfile output.pb config.json c1.json c2.json c3.json
+    {{.Exec}} convert pb -debug mix.pb
 	`,
 	Run: executeConvertConfigsToProtobuf,
 }
 
 func executeConvertConfigsToProtobuf(cmd *base.Command, args []string) {
 
+	var optFile string
 	var optDump bool
 	var optType bool
 
+	cmd.Flag.StringVar(&optFile, "o", "", "")
+	cmd.Flag.StringVar(&optFile, "outpbfile", "", "")
 	cmd.Flag.BoolVar(&optDump, "d", false, "")
 	cmd.Flag.BoolVar(&optDump, "debug", false, "")
 	cmd.Flag.BoolVar(&optType, "t", false, "")
@@ -52,6 +60,17 @@ func executeConvertConfigsToProtobuf(cmd *base.Command, args []string) {
 		unnamedArgs.Set(v)
 	}
 
+	if len(optFile) > 0 {
+		switch core.GetFormatByExtension(getFileExtension(optFile)){
+		case "protobuf", "":
+			fmt.Println("Output ProtoBuf file is ", optFile)
+		default:
+			base.Fatalf("-outpbfile followed by a possible original config.")
+		}
+	} else if !optDump {
+		base.Fatalf("-outpbfile not specified")
+	}
+
 	if len(unnamedArgs) < 1 {
 		base.Fatalf("invalid config list length: %d", len(unnamedArgs))
 	}
@@ -70,12 +89,28 @@ func executeConvertConfigsToProtobuf(cmd *base.Command, args []string) {
 		}
 	}
 
-	bytesConfig, err := proto.Marshal(pbConfig)
-	if err != nil {
-		base.Fatalf("failed to marshal proto config: %s", err)
-	}
+	if len(optFile) > 0 {
+		bytesConfig, err := proto.Marshal(pbConfig)
+		if err != nil {
+			base.Fatalf("failed to marshal proto config: %s", err)
+		}
 
-	if _, err := os.Stdout.Write(bytesConfig); err != nil {
-		base.Fatalf("failed to write proto config: %s", err)
+		f, err := os.Create(optFile)
+		if err != nil {
+			base.Fatalf("failed to create proto file: %s", err)
+		}
+		defer f.Close()
+
+		if _, err := f.Write(bytesConfig); err != nil {
+			base.Fatalf("failed to write proto file: %s", err)
+		}
 	}
 }
+
+func getFileExtension(filename string) string {
+	idx := strings.LastIndexByte(filename, '.')
+	if idx == -1 {
+		return ""
+	}
+	return filename[idx+1:]
+}