Form Prefilling
2 min read
Definition
Form prefilling (also called autofill or pre-population) is the practice of automatically filling in form fields with known data before the user sees the form. This data can come from URL parameters, CRM records, cookies, browser autofill, or API calls.
How It Works
URL parameters
Append field values to the form link: ?name=John&[email protected]
CRM / database lookup
Query your CRM by email or user ID and populate matching fields.
Browser autofill
Leverage saved browser data for name, email, address, and payment info.
Hidden fields
Pass tracking data (UTM parameters, referrer) without user input.
Why It Matters for Forms and Surveys
- Reduces friction: fewer fields to fill out means higher completion rates.
- Improves data accuracy: pre-filled data from your database is more reliable than manual entry.
- Personalizes the experience: greeting users by name builds trust and engagement.
- Enables progressive profiling: only ask for new information each time a returning user visits.
Best Practices
- Let users edit prefilled values: never lock fields. Data can be outdated.
- Do not prefill sensitive fields: passwords, SSNs, and credit card numbers should always be entered fresh.
- Respect privacy laws: disclose how you obtained the data and comply with GDPR/CCPA.
- Test across devices: ensure prefill works on mobile browsers and in-app webviews.
Related Terms