Effect snapshot
Intervention Enable browser autofill and autocomplete attributes on signup/checkout forms
Outcome Form completion rate
Effect 5–12 percent relative increase
Confidence ab_test
Context Mobile and desktop web forms, e-commerce and SaaS, 2023–2025

Sources

What changes

Proper autocomplete attributes are often associated with a 5–12% relative lift in form completion by reducing typing friction.

When this tends to work

  • Conditions similar to: Mobile and desktop web forms, e-commerce and SaaS, 2023–2025
  • You can measure Form completion rate reliably
  • The intervention is implemented consistently, not half-measured

When to be careful

  • Your audience or product differs materially from the cited context
  • Compliance costs or second-order effects outweigh the lift
  • Evidence label is ab_test—treat wide ranges as planning bands, not promises

Practical takeaway

Use the cited range for prioritization and test design. Verify against your own data before scaling.