✨ Features
Prefilled Fields
Automatically populate form fields with data you already know — an email address passed from your app, a plan name, a referral code — so respondents don't have to type it themselves.
Key capabilities
- Choose which fields can be pre-filled from the Share tab of your form settings
- Values are passed as parameters on the embed code CustomGForm generates for you
- Works with both the Embed to the web page and Share the link options
- When using Share the link, prefill values are appended as URL query parameters (
?prefill=...)
Prefilled values are set per link/embed, not stored on the form — the same form can be embedded multiple times with different prefilled values.
Learn more
Dark Theme Support for Google Forms
Add a responsive dark mode palette, automatic system dark mode detection, and an optional theme toggle to any Google Form with CustomGForm.
Hidden Fields for Google Forms
Pass tracking IDs, UTM parameters, and metadata silently into your Google Form submissions with CustomGForm hidden fields.