Form Fields Best Practices: A Complete Guide to Every Field Type
The definitive guide to using form fields correctly. When to use dropdowns vs radio buttons, how to handle phone numbers in India, and more.
Table of Contents
Form field choice is one of the most consequential design decisions you make. The wrong field type creates friction; the right one feels invisible. This guide covers every major form field type and when to use each one.
Text Fields: When to Use Them and When to Replace Them
Text fields are the most flexible but the most error-prone field type. For structured data (phone, pincode, dates), always replace text fields with specialized inputs. For truly open-ended responses, text fields (or textarea for longer answers) are the right choice.
- Use for: Name, company name, address, open-ended answers
- Replace with dropdown for: State, country, known options with 5+ choices
- Replace with tel type for: Phone numbers
- Replace with email type for: Email addresses
- Replace with date picker for: Dates
Phone Number Fields: The India-Specific Guide
Phone numbers in India have unique characteristics. Mobile numbers are 10 digits. Some users prefix with +91 or 0. Business landlines have 2-4 digit STD codes. Here is how to handle all scenarios gracefully.
- Use type="tel" for proper mobile keyboard
- Add a +91 prefix selector or default placeholder "+91"
- Validate: Indian mobile numbers start with 6, 7, 8, or 9
- Accept both formats: 9876543210 and +919876543210
- Optionally add OTP verification for high-value form submissions
Checkboxes vs Multi-Select: Choosing the Right Multiple-Choice Field
When users can select multiple options, you have two main choices: checkboxes (for 2-8 options) and multi-select dropdowns (for 8+ options). Checkboxes are almost always better on mobile — multi-select dropdowns are notoriously difficult to use on touchscreens.
- Use checkboxes for: Up to 8 options on mobile
- Use multi-select dropdown for: 10+ options on desktop
- Use tag input for: Truly open-ended multi-select (interests, skills, etc.)
- Consider image checkboxes for: Visual choices (form templates, product variants)
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Get Started FreeFrequently Asked Questions
Should form fields be left-aligned or centered?
Left-aligned labels and fields are easier to read and fill because they follow natural reading direction. Centered forms look elegant in design mockups but perform worse in usability studies. Use full-width fields in a single column on mobile, and single-column layout even on desktop for most forms.
How should I handle Indian names in form fields?
Use a single "Full Name" field rather than separate First Name and Last Name fields for Indian audiences. Indian naming conventions are highly diverse — many south Indian names don't follow a first/last structure. A single name field respects this diversity and reduces friction. Avoid limiting characters (some names are long).