Messages that explain what went wrong and how the user can resolve it.
Field required
Tell the user a mandatory field is empty. Show as inline text under the input.
Example scenario
Appears below a form input when the user submits without filling a required field such as name, email, or password.
Invalid email address
Indicate that the entered email address isn’t valid. Show as inline text under the field.
Example scenario
Appears when the user types an incomplete or incorrectly formatted email address on sign-up, login, or contact forms.
Invalid phone number
Tell the user that the entered number isn’t formatted correctly. Show as inline text under the phone input.
Example scenario
Appears when the user omits the country code or enters symbols that are not allowed in the phone number format.
Invalid date format
Notify the user that the entered date doesn’t match the required format. Show as inline text under the date input.
Example scenario
Appears when the user enters an invalid date or uses the wrong separator characters.
Invalid number or value
Inform the user that a numeric input contains invalid characters or is outside the allowed range. Show as inline text under the field.
Example scenario
Appears when the user enters letters instead of numbers, or exceeds the permitted range.
Weak password
Inform the user that the password doesn’t meet security requirements. Show as inline text under the password field.
Example scenario
Appears when the password entered doesn’t meet strength requirements during account creation or reset.
Password mismatch
Notify the user that the confirmation password doesn’t match the first one. Show as inline text below the confirmation field.
Example scenario
Appears when the user types different values in the “Password” and “Confirm password” fields during sign-up or password reset.
File too large
Warn the user that an uploaded file exceeds size limits. Show as inline text under the upload area, or alert for multiple files.
Example scenario
Appears when a user tries to upload media or documents exceeding the allowed file size.
Unsupported file type
Notify the user that the uploaded file format isn’t supported. Show as inline text under the upload area, or dialog if multiple uploads fail.
Example scenario
Appears when the selected file type doesn’t match accepted formats.