Testing Short Helper Text Under Each Form Field

Validation error rate

Define the same eligible input attempts in both arms and compare validation errors.

• Form completion rateMake sure completion does not fall.
• Field-level abandonmentCheck whether visitors are less likely to leave the field with added guidance.
• Average completion timeTrack material increases in completion time and review reading burden separately.
• Support contactsCheck whether questions about the same field decrease.

• Helper textAdd one predefined, always-visible short explanation below the selected field.
• Keep constantKeep field design, label, validation and error messages unchanged.
• ScopeChoose a field based on observed errors instead of adding copy to every field.
• AudienceReview new and returning users separately.
• Separate testsTest examples, on-focus help or additional fields separately.

1. 1Do not add help to every field and make it impossible to identify what worked.
2. 2Do not use helper text as a replacement for an error message.
3. 3Do not hide the explanation behind a click if the test is meant to add visible guidance.
4. 4Keep the helper text readable; do not use low-contrast gray.
5. 5Do not use explanatory copy to patch a field design that needs a more direct fix.