diff --git a/docs/config.md b/docs/config.md
index 5bcbba5..10e3492 100644
--- a/docs/config.md
+++ b/docs/config.md
@@ -46,8 +46,8 @@ Database Playground 使用 PostgreSQL 作為資料庫。
 
 - `GAUTH_CLIENT_ID`：Google OAuth 的 Client ID
 - `GAUTH_CLIENT_SECRET`：Google OAuth 的 Client Secret
-- `GAUTH_REDIRECT_URI`：在完成 Google OAuth 流程後，要重新導向到的 URL，通常是指向前端。
-  - 舉例：你的前端會在進入起始連結前，記錄目前頁面的位址，然後在 `/auth/completed` endpoint 重新導向回使用者上次瀏覽的連結。這時，你可以將重新導向連結寫為 `https://app.yourdomain.tld/auth/completed`。如果你沒有這樣的 endpoint，寫上前端的首頁也是可以的。注意在起始連結帶入的 `state` 會被帶入這個 URI 中。
+- `GAUTH_REDIRECT_URIS`：在完成 Google OAuth 流程後，允許重新導向到的 URIs。
+  - 舉例：`https://admin.dbplay.app`
 
 Google OAuth 的登入起始連結為 `https://backend.yourdomain.tld/api/auth/google/login`，可選擇性帶入 `state` 參數。
 Google OAuth 的回呼連結為 `https://backend.yourdomain.tld/api/auth/google/callback`。
diff --git a/httpapi/auth/README.md b/httpapi/auth/README.md
index e6b82ab..91157ab 100644
--- a/httpapi/auth/README.md
+++ b/httpapi/auth/README.md
@@ -27,6 +27,6 @@ Auth 端點提供適合供網頁應用程式使用的認證 API。
 
 ## Google 登入
 
-如果您要觸發 Google 登入的流程，請前往 `GET /api/auth/google/login`。
+如果您要觸發 Google 登入的流程，請前往 `GET /api/auth/google/login`。可以帶入 `redirect_uri` 參數來在登入完成後轉導到指定畫面。
 
 這個頁面會重新導向到 Google 的登入頁面，登入後會回到 `POST /api/auth/google/callback` 並進行帳號登入和註冊手續。
diff --git a/httpapi/auth/gauth.go b/httpapi/auth/gauth.go
index 5e3579d..88c7317 100644
--- a/httpapi/auth/gauth.go
+++ b/httpapi/auth/gauth.go
@@ -1,6 +1,8 @@
 package authservice
 
 import (
+	"errors"
+	"fmt"
 	"net/http"
 	"net/url"
 
@@ -16,7 +18,10 @@ import (
 	"google.golang.org/api/option"
 )
 
-const verifierCookieName = "Gauth-Verifier"
+const (
+	verifierCookieName = "Gauth-Verifier"
+	redirectCookieName = "Gauth-Redirect"
+)
 
 // BuildOAuthConfig builds an oauth2.Config from a gauthConfig.
 func BuildOAuthConfig(gauthConfig config.GAuthConfig) *oauth2.Config {
@@ -32,13 +37,13 @@ func BuildOAuthConfig(gauthConfig config.GAuthConfig) *oauth2.Config {
 }
 
 type GauthHandler struct {
-	oauthConfig *oauth2.Config
-	useraccount *useraccount.Context
-	redirectURL string
+	oauthConfig  *oauth2.Config
+	useraccount  *useraccount.Context
+	redirectURIs []string
 }
 
-func NewGauthHandler(oauthConfig *oauth2.Config, useraccount *useraccount.Context, redirectURL string) *GauthHandler {
-	return &GauthHandler{oauthConfig: oauthConfig, useraccount: useraccount, redirectURL: redirectURL}
+func NewGauthHandler(oauthConfig *oauth2.Config, useraccount *useraccount.Context, redirectURIs []string) *GauthHandler {
+	return &GauthHandler{oauthConfig: oauthConfig, useraccount: useraccount, redirectURIs: redirectURIs}
 }
 
 func (h *GauthHandler) Login(c *gin.Context) {
@@ -55,6 +60,11 @@ func (h *GauthHandler) Login(c *gin.Context) {
 		return
 	}
 
+	redirectURI := c.Query("redirect_uri")
+	if redirectURI == "" {
+		redirectURI = h.oauthConfig.RedirectURL
+	}
+
 	callbackURL, err := url.Parse(h.oauthConfig.RedirectURL)
 	if err != nil {
 		c.JSON(http.StatusInternalServerError, gin.H{
@@ -74,6 +84,16 @@ func (h *GauthHandler) Login(c *gin.Context) {
 		/* httpOnly */ true,
 	)
 
+	c.SetCookie(
+		/* name */ redirectCookieName,
+		/* value */ redirectURI,
+		/* maxAge */ 5*60, // 5 min
+		/* path */ "/",
+		/* domain */ "",
+		/* secure */ true,
+		/* httpOnly */ true,
+	)
+
 	redirectURL := h.oauthConfig.AuthCodeURL(
 		"",
 		oauth2.AccessTypeOnline,
@@ -160,5 +180,55 @@ func (h *GauthHandler) Callback(c *gin.Context) {
 		/* httpOnly */ true,
 	)
 
-	c.Redirect(http.StatusTemporaryRedirect, h.redirectURL)
+	// redirect to the original redirect URL
+	redirectURL, err := c.Cookie(redirectCookieName)
+	if err != nil {
+		if errors.Is(err, http.ErrNoCookie) {
+			c.JSON(http.StatusOK, gin.H{
+				"success": true,
+			})
+			return
+		}
+
+		c.JSON(http.StatusInternalServerError, gin.H{
+			"error":  "failed to get redirect URL",
+			"detail": err.Error(),
+		})
+		return
+	}
+
+	// check if the redirect URL is in the allowed redirect URIs
+	userRedirectURL, err := url.Parse(redirectURL)
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{
+			"error":  "failed to parse redirect URL",
+			"detail": err.Error(),
+		})
+		return
+	}
+
+	for _, allowedRedirectURI := range h.redirectURIs {
+		parsedAllowedRedirectURI, err := url.Parse(allowedRedirectURI)
+		if err != nil {
+			c.JSON(http.StatusInternalServerError, gin.H{
+				"error":  "failed to parse allowed redirect URI",
+				"detail": err.Error(),
+			})
+			return
+		}
+
+		matched := userRedirectURL.Scheme == parsedAllowedRedirectURI.Scheme &&
+			userRedirectURL.Host == parsedAllowedRedirectURI.Host &&
+			userRedirectURL.Path == parsedAllowedRedirectURI.Path
+
+		if matched {
+			c.Redirect(http.StatusTemporaryRedirect, parsedAllowedRedirectURI.String())
+			return
+		}
+	}
+
+	c.JSON(http.StatusBadRequest, gin.H{
+		"error":  "redirect URL is not allowed",
+		"detail": fmt.Sprintf("redirect URL is not allowed: %s", redirectURL),
+	})
 }
diff --git a/httpapi/auth/root.go b/httpapi/auth/root.go
index 7aabf10..0b4a6e0 100644
--- a/httpapi/auth/root.go
+++ b/httpapi/auth/root.go
@@ -34,7 +34,7 @@ func (s *AuthService) Register(router gin.IRouter) {
 
 		useraccount := useraccount.NewContext(s.entClient, s.storage)
 
-		gauthHandler := NewGauthHandler(oauthConfig, useraccount, s.config.GAuth.RedirectURL)
+		gauthHandler := NewGauthHandler(oauthConfig, useraccount, s.config.GAuth.RedirectURIs)
 
 		gauth.GET("/login", gauthHandler.Login)
 		gauth.GET("/callback", gauthHandler.Callback)
diff --git a/internal/config/models.go b/internal/config/models.go
index f69c9c5..2c36602 100644
--- a/internal/config/models.go
+++ b/internal/config/models.go
@@ -71,9 +71,9 @@ func (c RedisConfig) Validate() error {
 }
 
 type GAuthConfig struct {
-	ClientID     string `env:"CLIENT_ID"`
-	ClientSecret string `env:"CLIENT_SECRET"`
-	RedirectURL  string `env:"REDIRECT_URL"`
+	ClientID     string   `env:"CLIENT_ID"`
+	ClientSecret string   `env:"CLIENT_SECRET"`
+	RedirectURIs []string `env:"REDIRECT_URIS"`
 }
 
 func (c GAuthConfig) Validate() error {
@@ -83,8 +83,8 @@ func (c GAuthConfig) Validate() error {
 	if c.ClientSecret == "" {
 		return errors.New("GAUTH_CLIENT_SECRET is required")
 	}
-	if c.RedirectURL == "" {
-		return errors.New("GAUTH_REDIRECT_URL is required")
+	if len(c.RedirectURIs) == 0 {
+		return errors.New("GAUTH_REDIRECT_URIS is required")
 	}
 
 	return nil