diff --git a/backend/controllers/students.go b/backend/controllers/students.go
index e2930050..467419b8 100644
--- a/backend/controllers/students.go
+++ b/backend/controllers/students.go
@@ -11,7 +11,7 @@ import (
 	"time"
 )
 
-// stores the input from frontend (Estudiante, JSON)
+// EstudianteInput stores the input from frontend (Estudiante, JSON)
 type EstudianteInput struct {
 	Dpi         string `json:"dpi"`
 	Nombre      string `json:"nombre"`
@@ -25,7 +25,7 @@ type EstudianteInput struct {
 	Universidad string `json:"universidad"`
 }
 
-// Creates a new user (type Estudiante).
+// NewStudent Creates a new user (type Estudiante).
 func NewStudent(c *gin.Context) {
 	var input EstudianteInput
 
@@ -41,6 +41,16 @@ func NewStudent(c *gin.Context) {
 	// parsing of the date (SQL format)
 	t, _ := time.Parse("2006-01-02", input.Nacimiento)
 
+	// revisar que el DPI tenga 13 caracteres
+	if len(input.Dpi) != 13 {
+		c.JSON(http.StatusBadRequest, responses.StandardResponse{
+			Status:  http.StatusBadRequest,
+			Message: "DPI must have 13 characters",
+			Data:    nil,
+		})
+		return
+	}
+
 	// Creates a new instance of Estudiante with the input data (local)
 	e := models.Estudiante{
 		IdEstudiante: input.Correo,
diff --git a/backend/tests/auth_student_test.go b/backend/tests/auth_student_test.go
index 70b0a534..b1675014 100644
--- a/backend/tests/auth_student_test.go
+++ b/backend/tests/auth_student_test.go
@@ -84,7 +84,7 @@ func TestNewStudent(t *testing.T) {
 
 	w := httptest.NewRecorder()
 
-	jsonData := `{"dpi": "101010101010", "nombre": "Estudiante", "apellido": "Prueba", "nacimiento": "01/01/2001", "correo": "estudiante@prueba.com", "telefono": "12345678", "carrera": 1, "semestre": 4, "contra": "estudianteprueba", "CV": "", "foto": "", "universidad": "Universidad del Valle de Guatemala"}`
+	jsonData := `{"dpi": "1010101010101", "nombre": "Estudiante", "apellido": "Prueba", "nacimiento": "01/01/2001", "correo": "estudiante@prueba.com", "telefono": "12345678", "carrera": 1, "semestre": 4, "contra": "estudianteprueba", "CV": "", "foto": "", "universidad": "Universidad del Valle de Guatemala"}`
 
 	body := bytes.NewBufferString(jsonData)