Inline validation

Inline validation checks each field as the user moves through the form, instead of waiting until they hit submit. The moment they leave a field, the form tells them whether the value worked.

Catching errors early saves the user from filling the rest of the form only to be told their email was wrong from the start. Less frustration, fewer abandoned forms, faster completion.

Be careful when to show the error. While the user is still typing, stay quiet — mid-typing errors feel like nagging. Wait for them to leave the field, then point out the problem with a short, helpful message.