How to Prefill a Signup Form With User Information - SMASHSEND

Availability: field prefilling is rolling out. The URL format below is the one it will use, so links you build now keep working once it is live. If you already know who someone is, you should not make them type it again.

Add a query parameter for each field you want to fill. The parameter name is the field key, which you can find next to each field in the form builder. Anything you do not pass is simply left blank. The person can still e

Query strings cannot contain raw spaces, ampersands or plus signs, so URL-encode every value you interpolate. In JavaScript:

Inside a SmashSend email you can build the link with contact properties, so each recipient gets their own prefilled form:

Two parameter names are reserved and are not treated as fields: - tracks who referred this signup. It is set automatically on the share links your referrers get, so do not overwrite it. - unlocks a password-protected for

Anything in a URL can be edited by the person opening it, so treat prefilled values as a convenience rather than as verified data. If you need to be certain who submitted a form, confirm it on your side, or turn on doubl

If you get stuck, email support@smashsend.com or contact us.