diff --git a/cmd/sing-box/cmd_convert.go b/cmd/sing-box/cmd_convert.go
deleted file mode 100644
index a88fe50c..00000000
--- a/cmd/sing-box/cmd_convert.go
+++ /dev/null
@@ -1,91 +0,0 @@
-package main
-
-import (
-	"os"
-	"path/filepath"
-
-	"github.com/sagernet/sing-box/common/conf"
-	"github.com/sagernet/sing-box/common/conf/mergers"
-	"github.com/sagernet/sing-box/log"
-	"github.com/sagernet/sing-box/option"
-	E "github.com/sagernet/sing/common/exceptions"
-
-	"github.com/spf13/cobra"
-)
-
-var commandConvertOutput string
-var commandConvertOutputFormat string
-
-var commandConvert = &cobra.Command{
-	Use:   "convert",
-	Short: "Convert configuration",
-	Long: `Convert and merge configuration files between different formats.
-
-Note: comments will be lost after conversion.`,
-	Run: func(cmd *cobra.Command, args []string) {
-		err := convert()
-		if err != nil {
-			log.Fatal(err)
-		}
-	},
-	Args: cobra.NoArgs,
-}
-
-func init() {
-	commandConvert.Flags().StringVarP(&commandConvertOutput, "output", "o", "", "output file")
-	commandConvert.Flags().StringVarP(&commandConvertOutputFormat, "output-format", "f", string(mergers.FormatJSON), "output format: json, yaml, toml")
-	mainCommand.AddCommand(commandConvert)
-}
-
-func convert() error {
-	var (
-		configContent []byte
-		err           error
-	)
-	format := mergers.ParseFormat(configFormat)
-	outFormat := mergers.ParseFormat(commandConvertOutputFormat)
-	switch outFormat {
-	case mergers.FormatJSON,
-		mergers.FormatYAML,
-		mergers.FormatTOML:
-		// ok
-	default:
-		return E.New("unsupported output format: ", commandConvertOutputFormat)
-	}
-	if len(configPaths) == 1 && configPaths[0] == "stdin" {
-		configContent, err = conf.ReaderToJSON(os.Stdin, format)
-	} else {
-		configContent, err = conf.FilesToJSON(configPaths, format, configRecursive)
-	}
-	if err != nil {
-		return E.Cause(err, "read config")
-	}
-
-	var options option.Options
-	err = options.UnmarshalJSON(configContent)
-	if err != nil {
-		return E.Cause(err, "decode config")
-	}
-	content, err := conf.Sprint(options, outFormat)
-	if err != nil {
-		return E.Cause(err, "encode config")
-	}
-
-	if commandConvertOutput == "" {
-		os.Stdout.WriteString(content + "\n")
-		return nil
-	}
-
-	output, err := os.Create(commandConvertOutput)
-	if err != nil {
-		return E.Cause(err, "open output")
-	}
-	_, err = output.WriteString(content)
-	output.Close()
-	if err != nil {
-		return E.Cause(err, "write output")
-	}
-	outputPath, _ := filepath.Abs(commandConvertOutput)
-	os.Stderr.WriteString(outputPath + "\n")
-	return nil
-}
diff --git a/cmd/sing-box/cmd_format.go b/cmd/sing-box/cmd_format.go
index 01ab1381..6b5640f3 100644
--- a/cmd/sing-box/cmd_format.go
+++ b/cmd/sing-box/cmd_format.go
@@ -6,7 +6,6 @@ import (
 	"path/filepath"
 	"strings"
 
-	"github.com/sagernet/sing-box/common/conf/mergers"
 	"github.com/sagernet/sing-box/common/json"
 	"github.com/sagernet/sing-box/log"
 	"github.com/sagernet/sing-box/option"
@@ -19,7 +18,7 @@ var commandFormatFlagWrite bool
 
 var commandFormat = &cobra.Command{
 	Use:   "format",
-	Short: "Format configuration (json only)",
+	Short: "Format configuration",
 	Run: func(cmd *cobra.Command, args []string) {
 		err := format()
 		if err != nil {
@@ -39,16 +38,9 @@ func format() error {
 		return E.New("only one file can be formatted at a time")
 	}
 	configPath := configPaths[0]
-	format := mergers.ParseFormat(configFormat)
-	isJSON := strings.EqualFold(filepath.Ext(configPath), ".json")
-	// only json is supported, since:
-	// 1. all other foramts will lost comments after formatting
-	// 2. fields order is shuffled for yaml and toml, because of the nature of the go map
-	if format != mergers.FormatJSON &&
-		(format == mergers.FormatAuto && !isJSON) {
+	if strings.EqualFold(filepath.Ext(configPath), ".json") {
 		return E.New("only json format is supported")
 	}
-
 	configContent, err := os.ReadFile(configPath)
 	if err != nil {
 		return E.Cause(err, "read config")
diff --git a/cmd/sing-box/cmd_run.go b/cmd/sing-box/cmd_run.go
index 7415acd4..90f36cf0 100644
--- a/cmd/sing-box/cmd_run.go
+++ b/cmd/sing-box/cmd_run.go
@@ -37,7 +37,7 @@ func readConfig() (option.Options, error) {
 		configContent []byte
 		err           error
 	)
-	format := mergers.ParseFormat(configFormat)
+	format := mergers.FormatAuto
 	if len(configPaths) == 1 && configPaths[0] == "stdin" {
 		configContent, err = conf.ReaderToJSON(os.Stdin, format)
 	} else {
diff --git a/cmd/sing-box/main.go b/cmd/sing-box/main.go
index e2a19276..f4b4eef3 100644
--- a/cmd/sing-box/main.go
+++ b/cmd/sing-box/main.go
@@ -3,7 +3,6 @@ package main
 import (
 	"os"
 
-	"github.com/sagernet/sing-box/common/conf/mergers"
 	_ "github.com/sagernet/sing-box/include"
 	"github.com/sagernet/sing-box/log"
 
@@ -12,7 +11,6 @@ import (
 
 var (
 	configPaths     []string
-	configFormat    string
 	configRecursive bool
 	workingDir      string
 	disableColor    bool
@@ -25,7 +23,6 @@ var mainCommand = &cobra.Command{
 
 func init() {
 	mainCommand.PersistentFlags().StringArrayVarP(&configPaths, "config", "c", []string{"config.json"}, "set configuration files / directories")
-	mainCommand.PersistentFlags().StringVarP(&configFormat, "config-format", "", string(mergers.FormatAuto), "configuration files format: auto, json, jsonc, yaml, toml")
 	mainCommand.PersistentFlags().BoolVarP(&configRecursive, "config-recursive", "r", false, "load configuration directories recursively")
 	mainCommand.PersistentFlags().StringVarP(&workingDir, "directory", "D", "", "set working directory")
 	mainCommand.PersistentFlags().BoolVarP(&disableColor, "disable-color", "", false, "disable color output")
diff --git a/common/conf/mergers/mergers.go b/common/conf/mergers/mergers.go
index a795270f..b389ba68 100644
--- a/common/conf/mergers/mergers.go
+++ b/common/conf/mergers/mergers.go
@@ -6,11 +6,8 @@ import (
 	"fmt"
 	"strings"
 
-	"github.com/pelletier/go-toml"
 	"github.com/sagernet/sing-box/common/conf/jsonc"
-	"github.com/sagernet/sing-box/common/conf/merge"
 	"github.com/sagernet/sing/common"
-	"gopkg.in/yaml.v2"
 )
 
 func init() {
@@ -36,30 +33,6 @@ func init() {
 			return m, nil
 		},
 	)))
-	common.Must(registerMerger(makeMerger(
-		FormatTOML,
-		[]string{".toml"},
-		func(v []byte) (map[string]interface{}, error) {
-			m := make(map[string]interface{})
-			if err := toml.Unmarshal(v, &m); err != nil {
-				return nil, err
-			}
-			return m, nil
-		},
-	)))
-	common.Must(registerMerger(makeMerger(
-		FormatYAML,
-		[]string{".yml", ".yaml"},
-		func(v []byte) (map[string]interface{}, error) {
-			m1 := make(map[interface{}]interface{})
-			err := yaml.Unmarshal(v, &m1)
-			if err != nil {
-				return nil, err
-			}
-			m2 := merge.Convert(m1)
-			return m2, nil
-		},
-	)))
 	common.Must(registerMerger(
 		&Merger{
 			Name:       FormatAuto,
diff --git a/common/conf/output.go b/common/conf/output.go
deleted file mode 100644
index a93c513b..00000000
--- a/common/conf/output.go
+++ /dev/null
@@ -1,50 +0,0 @@
-package conf
-
-import (
-	"bytes"
-	"encoding/json"
-	"fmt"
-
-	"github.com/pelletier/go-toml"
-	"github.com/sagernet/sing-box/common/conf/mergers"
-	"gopkg.in/yaml.v2"
-)
-
-// Sprint returns the text of give format for v
-func Sprint(v interface{}, format mergers.Format) (string, error) {
-	var (
-		out []byte
-		err error
-	)
-	buffer := new(bytes.Buffer)
-	encoder := json.NewEncoder(buffer)
-	encoder.SetIndent("", "  ")
-	err = encoder.Encode(v)
-	if err != nil {
-		return "", fmt.Errorf("failed to convert to json: %s", err)
-	}
-	if format == mergers.FormatJSON || format == mergers.FormatJSONC {
-		return string(buffer.Bytes()), nil
-	}
-
-	m := make(map[string]interface{})
-	err = json.Unmarshal(buffer.Bytes(), &m)
-	if err != nil {
-		return "", err
-	}
-	switch format {
-	case mergers.FormatTOML:
-		out, err = toml.Marshal(m)
-		if err != nil {
-			return "", fmt.Errorf("failed to convert to toml: %s", err)
-		}
-	case mergers.FormatYAML:
-		out, err = yaml.Marshal(m)
-		if err != nil {
-			return "", fmt.Errorf("failed to convert to yaml: %s", err)
-		}
-	default:
-		return "", fmt.Errorf("invalid output format: %s", format)
-	}
-	return string(out), nil
-}
diff --git a/go.mod b/go.mod
index 8c641a38..bb30bf31 100644
--- a/go.mod
+++ b/go.mod
@@ -20,7 +20,6 @@ require (
 	github.com/mholt/acmez v1.0.4
 	github.com/miekg/dns v1.1.50
 	github.com/oschwald/maxminddb-golang v1.10.0
-	github.com/pelletier/go-toml v1.9.5
 	github.com/pires/go-proxyproto v0.6.2
 	github.com/refraction-networking/utls v1.1.2
 	github.com/sagernet/quic-go v0.0.0-20220818150011-de611ab3e2bb
@@ -42,7 +41,6 @@ require (
 	golang.zx2c4.com/wireguard v0.0.0-20220829161405-d1d08426b27b
 	google.golang.org/grpc v1.49.0
 	google.golang.org/protobuf v1.28.1
-	gopkg.in/yaml.v2 v2.4.0
 	gvisor.dev/gvisor v0.0.0-20220901235040-6ca97ef2ce1c
 )
 
diff --git a/go.sum b/go.sum
index b269d984..82e173b9 100644
--- a/go.sum
+++ b/go.sum
@@ -128,8 +128,6 @@ github.com/onsi/gomega v1.10.1/go.mod h1:iN09h71vgCQne3DLsj+A5owkum+a2tYe+TOCB1y
 github.com/onsi/gomega v1.13.0 h1:7lLHu94wT9Ij0o6EWWclhu0aOh32VxhkwEJvzuWPeak=
 github.com/oschwald/maxminddb-golang v1.10.0 h1:Xp1u0ZhqkSuopaKmk1WwHtjF0H9Hd9181uj2MQ5Vndg=
 github.com/oschwald/maxminddb-golang v1.10.0/go.mod h1:Y2ELenReaLAZ0b400URyGwvYxHV1dLIxBuyOsyYjHK0=
-github.com/pelletier/go-toml v1.9.5 h1:4yBQzkHv+7BHq2PQUZF3Mx0IYxG7LsP222s7Agd3ve8=
-github.com/pelletier/go-toml v1.9.5/go.mod h1:u1nR/EPcESfeI/szUZKdtJ0xRNbUoANCkoOuaOx1Y+c=
 github.com/pires/go-proxyproto v0.6.2 h1:KAZ7UteSOt6urjme6ZldyFm4wDe/z0ZUP0Yv0Dos0d8=
 github.com/pires/go-proxyproto v0.6.2/go.mod h1:Odh9VFOZJCf9G8cLW5o435Xf1J95Jw9Gw5rnCjcwzAY=
 github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=