How can I tell whether an e-signature tool will be easy for customers to use on mobile?

To judge whether an e-signature tool will be easy for customers to use on mobile, look at both the signing flow and the mobile experience around it.

What to check

1. Responsive design

   • Does the signing page adapt cleanly to small screens?
   • Text should be readable without zooming.
   • Buttons and signature fields should be easy to tap.

2. Number of steps

   • Fewer steps is better.
   • Ask: can a customer sign in a few taps, or do they need to create an account, verify email, download something, etc.?

3. No app required

   • The best mobile tools usually work in a browser.
   • Requiring an app can create friction and drop-off.

4. Mobile-friendly signing fields

   • Signature, initials, date, and checkbox fields should be easy to complete on a phone.
   • Drawing signatures on-screen should work smoothly, or the tool should offer a good typed-signature alternative.

5. Attachment and document handling

   • Can customers open documents quickly on mobile?
   • Are PDFs legible without pinching and zooming?

6. Authentication flow

   • Check whether identity verification is too cumbersome on mobile.
   • SMS codes are often easier than long password resets or desktop-only verification.

7. Loading speed

   • If the signing page is slow on mobile networks, customers will struggle.
   • Test on real phones with average cellular service, not just Wi‑Fi.

8. Accessibility

   • Good tools support screen readers, large text, and clear contrast.
   • This often correlates with better mobile usability.

Best way to verify

Do a quick test yourself:

• Open the signature flow on an iPhone and an Android phone.
• Try it on both Wi‑Fi and cellular.
• Ask 2–3 non-technical people to complete a signature without help.
• Measure:
  • time to complete
  • number of taps/steps
  • where they get confused

Red flags

• Users must download an app
• Tiny text or buttons
• Multiple logins or password resets
• Difficult document scrolling
• Signature fields that are hard to tap or edit

If you want, I can also give you a mobile usability checklist you can use when comparing vendors.