diff --git a/cmd/um/main.go b/cmd/um/main.go
new file mode 100644
index 0000000..ff0ebff
--- /dev/null
+++ b/cmd/um/main.go
@@ -0,0 +1,134 @@
+package main
+
+import (
+	"errors"
+	"github.com/umlock-music/cli/algo/common"
+	_ "github.com/umlock-music/cli/algo/kgm"
+	_ "github.com/umlock-music/cli/algo/kwm"
+	_ "github.com/umlock-music/cli/algo/ncm"
+	_ "github.com/umlock-music/cli/algo/qmc"
+	_ "github.com/umlock-music/cli/algo/tm"
+	_ "github.com/umlock-music/cli/algo/xm"
+	"github.com/umlock-music/cli/internal/logging"
+	"github.com/urfave/cli/v2"
+	"go.uber.org/zap"
+	"log"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+func main() {
+	app := cli.App{
+		Name:     "Unlock Music CLI",
+		HelpName: "um",
+		Usage:    "Unlock your encrypted music file https://github.com/unlock-music/cli",
+		Version:  "v0.0.1",
+		Flags: []cli.Flag{
+			&cli.StringFlag{Name: "input", Aliases: []string{"i"}, Usage: "path to input file or dir", Required: true},
+			&cli.StringFlag{Name: "output", Aliases: []string{"o"}, Usage: "path to output dir", Required: true},
+		},
+		Action:          appMain,
+		Copyright:       "Copyright (c) 2020 Unlock Music https://github.com/unlock-music/cli/blob/master/LICENSE",
+		HideHelpCommand: true,
+		UsageText:       "um -i /path/to/input -o /path/to/output/dir",
+	}
+	err := app.Run(os.Args)
+	if err != nil {
+		log.Fatal(err)
+	}
+}
+
+func appMain(c *cli.Context) error {
+	input := c.String("input")
+	output := c.String("output")
+	inputStat, err := os.Stat(input)
+	if err != nil {
+		return err
+	}
+
+	outputStat, err := os.Stat(output)
+	if err != nil {
+		if errors.Is(err, os.ErrNotExist) {
+			err = os.MkdirAll(output, 0755)
+		}
+		if err != nil {
+			return err
+		}
+	} else if !outputStat.IsDir() {
+		return errors.New("output should be a writable directory")
+	}
+
+	if inputStat.IsDir() {
+		return dealDirectory(input, output)
+	} else {
+		ext := strings.TrimLeft(filepath.Ext(inputStat.Name()), ".")
+		allDec := common.GetDecoder(ext)
+		if len(allDec) == 0 {
+			logging.Log().Fatal("skipping while no suitable decoder")
+		}
+		return tryDecFile(input, output, allDec)
+	}
+
+}
+func dealDirectory(inputDir string, outputDir string) error {
+	items, err := os.ReadDir(inputDir)
+	if err != nil {
+		return err
+	}
+	for _, item := range items {
+		if item.IsDir() {
+			continue
+		}
+		ext := strings.TrimLeft(filepath.Ext(item.Name()), ".")
+		allDec := common.GetDecoder(ext)
+		if len(allDec) == 0 {
+			logging.Log().Info("skipping while no suitable decoder", zap.String("file", item.Name()))
+			continue
+		}
+
+		err := tryDecFile(filepath.Join(inputDir, item.Name()), outputDir, allDec)
+		if err != nil {
+			logging.Log().Error("conversion failed", zap.String("source", item.Name()))
+		}
+	}
+	return nil
+}
+
+func tryDecFile(inputFile string, outputDir string, allDec []common.NewDecoderFunc) error {
+	file, err := os.ReadFile(inputFile)
+	if err != nil {
+		return err
+	}
+
+	var dec common.Decoder
+	for _, decFunc := range allDec {
+		dec = decFunc(file)
+		if err := dec.Validate(); err == nil {
+			break
+		}
+		logging.Log().Warn("try decode failed", zap.Error(err))
+		dec = nil
+	}
+	if dec == nil {
+		return errors.New("no any decoder can resolve the file")
+	}
+	if err := dec.Decode(); err != nil {
+		return errors.New("failed while decoding: " + err.Error())
+	}
+
+	outExt := dec.GetAudioExt()
+	if outExt == "" {
+		outExt = "mp3"
+	}
+	filenameOnly := strings.TrimSuffix(filepath.Base(inputFile), filepath.Ext(inputFile))
+
+	outPath := filepath.Join(outputDir, filenameOnly+"."+outExt)
+	err = os.WriteFile(outPath, dec.GetAudioData(), 0644)
+	if err != nil {
+		return err
+	}
+	logging.Log().Info("successfully converted",
+		zap.String("source", inputFile), zap.String("destination", outPath))
+	return nil
+}
diff --git a/go.mod b/go.mod
index 657ffd1..b3c1d3a 100644
--- a/go.mod
+++ b/go.mod
@@ -3,8 +3,11 @@ module github.com/umlock-music/cli
 go 1.16
 
 require (
+	github.com/cpuguy83/go-md2man/v2 v2.0.0 // indirect
 	github.com/davecgh/go-spew v1.1.1
+	github.com/russross/blackfriday/v2 v2.1.0 // indirect
 	github.com/ulikunitz/xz v0.5.9
+	github.com/urfave/cli/v2 v2.3.0
 	go.uber.org/multierr v1.6.0 // indirect
 	go.uber.org/zap v1.16.0
 )
diff --git a/go.sum b/go.sum
index c6b8cfa..3801a5f 100644
--- a/go.sum
+++ b/go.sum
@@ -1,5 +1,9 @@
 github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d h1:U+s90UTSYgptZMwQh2aRr3LuazLJIa+Pg3Kc1ylSYVY=
+github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
+github.com/cpuguy83/go-md2man/v2 v2.0.0 h1:EoUDS0afbrsXAZ9YQ9jdu/mZ2sXgT1/2yyNng4PGlyM=
+github.com/cpuguy83/go-md2man/v2 v2.0.0/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
@@ -13,12 +17,20 @@ github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINE
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/rogpeppe/go-internal v1.3.0/go.mod h1:M8bDsm7K2OlrFYOpmOWEs/qY81heoFRclV5y23lUDJ4=
+github.com/russross/blackfriday/v2 v2.0.1 h1:lPqVAte+HuHNfhJ/0LC98ESWRz8afy9tM/0RK8m9o+Q=
+github.com/russross/blackfriday/v2 v2.0.1/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
+github.com/russross/blackfriday/v2 v2.1.0 h1:JIOH55/0cWyOuilr9/qlrm0BSXldqnqwMsf35Ld67mk=
+github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
+github.com/shurcooL/sanitized_anchor_name v1.0.0 h1:PdmoCO6wvbs+7yrJyMORt4/BmY5IYyJwS/kOiWx8mHo=
+github.com/shurcooL/sanitized_anchor_name v1.0.0/go.mod h1:1NzhyTcUVG4SuEtjjoZeVRXNmyL/1OwPU0+IJeTBvfc=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
 github.com/stretchr/testify v1.4.0 h1:2E4SXV/wtOkTonXsotYi4li6zVWxYlZuYNCXe9XRJyk=
 github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
 github.com/ulikunitz/xz v0.5.9 h1:RsKRIA2MO8x56wkkcd3LbtcE/uMszhb6DpRf+3uwa3I=
 github.com/ulikunitz/xz v0.5.9/go.mod h1:nbz6k7qbPmH4IRqmfOplQw/tblSgqTqBwxkY0oWt/14=
+github.com/urfave/cli/v2 v2.3.0 h1:qph92Y649prgesehzOrQjdWyxFOp/QVM+6imKHad91M=
+github.com/urfave/cli/v2 v2.3.0/go.mod h1:LJmUH05zAU44vOAcrfzZQKsZbVcdbOG8rtL3/XcUArI=
 go.uber.org/atomic v1.6.0/go.mod h1:sABNBOSYdrvTF6hTgEIbc7YasKWGhgEQZyfxyTvoXHQ=
 go.uber.org/atomic v1.7.0 h1:ADUqmZGgLDDfbSL9ZmPxKTybcoEYHgpYfELNoN+7hsw=
 go.uber.org/atomic v1.7.0/go.mod h1:fEN4uk6kAWBTFdckzkM89CLk9XfWZrxpCo0nPH17wJc=
@@ -51,5 +63,6 @@ gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8
 gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
 gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.3/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 honnef.co/go/tools v0.0.1-2019.2.3 h1:3JgtbtFHMiCmsznwGVTUWbgGov+pVqnlf1dEJTNAXeM=
 honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=