diff --git a/config/config.go b/config/config.go
index 5f568c9..15982e4 100644
--- a/config/config.go
+++ b/config/config.go
@@ -21,7 +21,6 @@ type Config struct {
 	SslKey      string
 	SslCacert   string // mTLS for device
 	Token       string
-	FontSize    int
 	WhiteList   map[string]bool
 	DB          string
 }
@@ -77,7 +76,6 @@ func Parse(c *cli.Context) *Config {
 		getConfigOpt(yamlCfg, "ssl-cacert", &cfg.SslCacert)
 		getConfigOpt(yamlCfg, "token", &cfg.Token)
 		getConfigOpt(yamlCfg, "db", &cfg.DB)
-		getConfigOpt(yamlCfg, "font-size", &cfg.FontSize)
 
 		val, err := yamlCfg.Get("white-list")
 		if err == nil {
@@ -91,14 +89,6 @@ func Parse(c *cli.Context) *Config {
 		}
 	}
 
-	if cfg.FontSize == 0 {
-		cfg.FontSize = 16
-	}
-
-	if cfg.FontSize < 12 {
-		cfg.FontSize = 12
-	}
-
 	if cfg.SslCert != "" && cfg.SslKey != "" {
 		_, err := os.Lstat(cfg.SslCert)
 		if err != nil {
diff --git a/http.go b/http.go
index 65a385f..716ee47 100644
--- a/http.go
+++ b/http.go
@@ -3,9 +3,11 @@ package main
 import (
 	"database/sql"
 	"embed"
+	"fmt"
 	"net"
 	"net/http"
 	"path"
+	"strconv"
 	"strings"
 	"time"
 
@@ -81,22 +83,9 @@ func httpAuth(c *gin.Context) bool {
 	return true
 }
 
-func initDb(cfg *config.Config) {
-	db, err := sql.Open("sqlite3", cfg.DB)
-	if err != nil {
-		log.Error().Msg(err.Error())
-		return
-	}
-	defer db.Close()
-
-	db.Exec("CREATE TABLE IF NOT EXISTS account(username TEXT PRIMARY KEY NOT NULL, password TEXT NOT NULL)")
-}
-
 func httpStart(br *broker) {
 	cfg := br.cfg
 
-	initDb(cfg)
-
 	httpSessions = cache.New(30*time.Minute, 5*time.Second)
 
 	gin.SetMode(gin.ReleaseMode)
@@ -115,22 +104,54 @@ func httpStart(br *broker) {
 	})
 
 	authorized.GET("/fontsize", func(c *gin.Context) {
-		c.JSON(http.StatusOK, gin.H{"size": cfg.FontSize})
+		db, err := sql.Open("sqlite3", cfg.DB)
+		if err != nil {
+			log.Error().Msg(err.Error())
+			c.Status(http.StatusInternalServerError)
+			return
+		}
+		defer db.Close()
+
+		value := "16"
+
+		db.QueryRow("SELECT value FROM config WHERE name = 'FontSize'").Scan(&value)
+
+		FontSize, _ := strconv.Atoi(value)
+
+		c.JSON(http.StatusOK, gin.H{"size": FontSize})
 	})
 
 	authorized.POST("/fontsize", func(c *gin.Context) {
-		type Resp struct {
-			Size int `json:"size"`
-		}
-		var r Resp
-		err := c.BindJSON(&r)
+		data := make(map[string]int)
+
+		err := c.BindJSON(&data)
 		if err != nil {
 			c.Status(http.StatusBadRequest)
 			return
 		}
 
-		cfg.FontSize = r.Size
-		c.String(http.StatusOK, "OK")
+		size, ok := data["size"]
+		if !ok {
+			c.Status(http.StatusBadRequest)
+			return
+		}
+
+		db, err := sql.Open("sqlite3", cfg.DB)
+		if err != nil {
+			log.Error().Msg(err.Error())
+			c.Status(http.StatusInternalServerError)
+			return
+		}
+		defer db.Close()
+
+		if size < 12 {
+			size = 12
+		}
+
+		db.Exec("DELETE FROM config WHERE name = 'FontSize'")
+		db.Exec("INSERT INTO config values('FontSize',?)", fmt.Sprintf("%d", size))
+
+		c.Status(http.StatusOK)
 	})
 
 	authorized.GET("/connect/:devid", func(c *gin.Context) {
diff --git a/main.go b/main.go
index 9c9b006..17b5d12 100644
--- a/main.go
+++ b/main.go
@@ -1,6 +1,7 @@
 package main
 
 import (
+	"database/sql"
 	"fmt"
 	"os"
 	"runtime"
@@ -13,6 +14,19 @@ import (
 	"github.com/zhaojh329/rttys/version"
 )
 
+func initDb(cfg *config.Config) {
+	db, err := sql.Open("sqlite3", cfg.DB)
+	if err != nil {
+		log.Error().Msg(err.Error())
+		return
+	}
+	defer db.Close()
+
+	db.Exec("CREATE TABLE IF NOT EXISTS config(name TEXT PRIMARY KEY NOT NULL, value TEXT NOT NULL)")
+
+	db.Exec("CREATE TABLE IF NOT EXISTS account(username TEXT PRIMARY KEY NOT NULL, password TEXT NOT NULL)")
+}
+
 func runRttys(c *cli.Context) {
 	rlog.SetPath(c.String("log"))
 
@@ -34,6 +48,8 @@ func runRttys(c *cli.Context) {
 		log.Info().Msg("Build Time: " + version.BuildTime())
 	}
 
+	initDb(cfg)
+
 	br := newBroker(cfg)
 	go br.run()
 
diff --git a/rttys.conf b/rttys.conf
index 3ffbeec..2aa5206 100644
--- a/rttys.conf
+++ b/rttys.conf
@@ -8,8 +8,6 @@
 
 #token: a1d4cdb1a3cd6a0e94aa3599afcddcf5
 
-# font-size: 16
-
 # No login required to connect device.
 # Values can be device IDs separated by spaces,
 # or a "*" indicates that all devices do not require login