diff --git a/main.go b/main.go
index 14922a6..15544c6 100644
--- a/main.go
+++ b/main.go
@@ -2,10 +2,15 @@ package main
 
 import (
 	"encoding/gob"
+	"errors"
 	"log"
+	"os"
+	"path"
 	"strconv"
 	"strings"
 
+	"git.trj.tw/golang/mtfosbot/module/utils"
+
 	"git.trj.tw/golang/mtfosbot/model"
 	"git.trj.tw/golang/mtfosbot/module/background"
 	"git.trj.tw/golang/mtfosbot/module/config"
@@ -38,6 +43,18 @@ func main() {
 
 	go twitchirc.InitIRC()
 
+	// create thumbnail directory
+	conf := config.GetConf()
+	if !utils.CheckExists(conf.ImageRoot, true) {
+		log.Fatal(errors.New("image root not exists"))
+	}
+	if !utils.CheckExists(path.Join(conf.ImageRoot, "thumbnail"), true) {
+		err = os.MkdirAll(path.Join(conf.ImageRoot, "thumbnail"), 0775)
+		if err != nil {
+			log.Fatal(err)
+		}
+	}
+
 	server.Run(strings.Join([]string{":", strconv.Itoa(config.GetConf().Port)}, ""))
 }
 
diff --git a/router/rimg/rimg.go b/router/rimg/rimg.go
index 61ae1d3..cf4437d 100644
--- a/router/rimg/rimg.go
+++ b/router/rimg/rimg.go
@@ -7,7 +7,7 @@ import (
 	"image/jpeg"
 	_ "image/jpeg"
 	_ "image/png"
-	"io/ioutil"
+	"io"
 	"os"
 	"path"
 	"strconv"
@@ -19,8 +19,23 @@ import (
 	"git.trj.tw/golang/mtfosbot/module/utils"
 )
 
+func resizeImage(fio io.Reader, size int, wgth bool) (img image.Image, err error) {
+	img, _, err = image.Decode(fio)
+	w := 0
+	h := 0
+	if wgth {
+		w = size
+	} else {
+		h = size
+	}
+
+	img = resize.Resize(uint(w), uint(h), img, resize.Lanczos3)
+	return
+}
+
 // GetOriginImage -
 func GetOriginImage(c *context.Context) {
+	// max 1024
 	fname := c.Param("imgname")
 	conf := config.GetConf()
 	imgP := utils.ParsePath(conf.ImageRoot)
@@ -44,28 +59,25 @@ func GetOriginImage(c *context.Context) {
 	}
 	defer fileBuf.Close()
 
-	imgf, _, err := image.DecodeConfig(fileBuf)
+	imgf, format, err := image.DecodeConfig(fileBuf)
+	if err != nil {
+		c.ServerError(nil)
+		return
+	}
+
+	// reset pointer to 0
+	_, err = fileBuf.Seek(0, 0)
 	if err != nil {
 		c.ServerError(nil)
 		return
 	}
 
 	if imgf.Height > 1024 || imgf.Width > 1024 {
-		img, _, err := image.Decode(fileBuf)
-		if err != nil {
-			c.ServerError(nil)
-			return
-		}
-		w := 0
-		h := 0
-		if imgf.Width > imgf.Height {
-			w = 1024
-		} else {
-			h = 1024
-		}
+		img, err := resizeImage(fileBuf, 1024, imgf.Width > imgf.Height)
+
 		buf := new(bytes.Buffer)
-		m := resize.Resize(uint(w), uint(h), img, resize.Bilinear)
-		err = jpeg.Encode(buf, m, nil)
+
+		err = jpeg.Encode(buf, img, nil)
 		if err != nil {
 			c.ServerError(nil)
 			return
@@ -79,12 +91,167 @@ func GetOriginImage(c *context.Context) {
 		return
 	}
 
-	buf, err := ioutil.ReadAll(fileBuf)
+	// check type
+	if format != "jpeg" {
+		img, _, err := image.Decode(fileBuf)
+		if err != nil {
+			c.ServerError(nil)
+			return
+		}
+		buf := new(bytes.Buffer)
+		err = jpeg.Encode(buf, img, nil)
+		if err != nil {
+			c.ServerError(nil)
+			return
+		}
+
+		c.Writer.Header().Set("Content-Type", "image/jpeg")
+		io.Copy(c.Writer, buf)
+		return
+	}
+
 	c.Writer.Header().Set("Content-Type", "image/jpeg")
-	c.Writer.Header().Set("Content-Length", strconv.Itoa(len(buf)))
-	_, err = c.Writer.Write(buf)
+	io.Copy(c.Writer, fileBuf)
+}
+
+// GetThumbnailImage -
+func GetThumbnailImage(c *context.Context) {
+	// max 240
+	fname := c.Param("imgname")
+	conf := config.GetConf()
+	imgP := utils.ParsePath(conf.ImageRoot)
+	exists := utils.CheckExists(imgP, true)
+	if !exists {
+		c.NotFound("image path not found")
+		return
+	}
+
+	thumbP := path.Join(imgP, "thumbnail", fname)
+	genNew := false
+	if !utils.CheckExists(thumbP, false) {
+		genNew = true
+		thumbP = path.Join(imgP, fname)
+		exists = utils.CheckExists(thumbP, false)
+		if !exists {
+			c.NotFound("image file not found")
+			return
+		}
+	}
+
+	filebuf, err := os.Open(thumbP)
 	if err != nil {
 		c.ServerError(nil)
 		return
 	}
+	defer filebuf.Close()
+
+	imgconf, format, err := image.DecodeConfig(filebuf)
+	if err != nil {
+		c.ServerError(nil)
+		return
+	}
+
+	// reset file reader ptr
+	_, err = filebuf.Seek(0, 0)
+	if err != nil {
+		c.ServerError(nil)
+		return
+	}
+
+	if imgconf.Height > 240 || imgconf.Width > 240 {
+		img, err := resizeImage(filebuf, 240, imgconf.Width > imgconf.Height)
+		if err != nil {
+			c.ServerError(nil)
+			return
+		}
+
+		buf := new(bytes.Buffer)
+		err = jpeg.Encode(buf, img, nil)
+		if err != nil {
+			c.ServerError(nil)
+			return
+		}
+		breader := bytes.NewReader(buf.Bytes())
+
+		if genNew {
+			savep := path.Join(conf.ImageRoot, "thumbnail", fname)
+			err := saveNewThumbnail(breader, savep)
+			if err != nil {
+				c.ServerError(nil)
+				return
+			}
+			_, err = breader.Seek(0, 0)
+			if err != nil {
+				c.ServerError(nil)
+				return
+			}
+		}
+
+		c.Writer.Header().Set("Content-Type", "image/jpeg")
+		io.Copy(c.Writer, breader)
+		return
+	}
+
+	if format != "jpeg" {
+		img, _, err := image.Decode(filebuf)
+		if err != nil {
+			c.ServerError(nil)
+			return
+		}
+		buf := new(bytes.Buffer)
+		err = jpeg.Encode(buf, img, nil)
+		if err != nil {
+			c.ServerError(nil)
+			return
+		}
+
+		breader := bytes.NewReader(buf.Bytes())
+
+		savep := path.Join(conf.ImageRoot, "thumbnail", fname)
+		err = saveNewThumbnail(breader, savep)
+		if err != nil {
+			c.ServerError(nil)
+			return
+		}
+
+		_, err = breader.Seek(0, 0)
+		if err != nil {
+			c.ServerError(nil)
+			return
+		}
+
+		c.Writer.Header().Set("Content-Type", "image/jpeg")
+		io.Copy(c.Writer, breader)
+		return
+	}
+
+	if genNew {
+		savep := path.Join(conf.ImageRoot, "thumbnail", fname)
+		err := saveNewThumbnail(filebuf, savep)
+		if err != nil {
+			c.ServerError(nil)
+			return
+		}
+		_, err = filebuf.Seek(0, 0)
+		if err != nil {
+			c.ServerError(nil)
+			return
+		}
+	}
+
+	c.Writer.Header().Set("Content-Type", "image/jpeg")
+	io.Copy(c.Writer, filebuf)
+}
+
+func saveNewThumbnail(fio io.Reader, newp string) (err error) {
+	out, err := os.Create(newp)
+	if err != nil {
+		return err
+	}
+	_, err = io.Copy(out, fio)
+	if err != nil {
+		return err
+	}
+
+	return
 }
diff --git a/router/routes/routes.go b/router/routes/routes.go
index 47fe886..d8b5058 100644
--- a/router/routes/routes.go
+++ b/router/routes/routes.go
@@ -51,10 +51,8 @@ func SetRoutes(r *gin.Engine) {
 
 	imageProcGroup := r.Group("/image")
 	{
-		imageProcGroup.GET("/origin", func(c *gin.Context) {
-			c.String(200, "test msg")
-		})
 		imageProcGroup.GET("/origin/:imgname", context.PatchCtx(rimg.GetOriginImage))
+		imageProcGroup.GET("/thumbnail/:imgname", context.PatchCtx(rimg.GetThumbnailImage))
 	}
 
 	apiGroup := r.Group("/api")