- Requires a paid subscription, not a one-off purchase
- Depends on Squarespace's form lightbox markup, so future changes may need an updated snippet
- Code injection needs a Business or Core plan or higher
- Not a form builder: the form is still Squarespace's own Form Block
Overview
What Form Lightbox Trigger (Will's Toolkit) is
This is a code snippet from Will Myers' Code Catalog inside Will's Toolkit, not a standalone plugin. The vendor describes it in one line: create a different trigger to open a form lightbox. It is available only to paid Toolkit members, tagged under Form Block, last updated 30 April 2025. The old listing here said it integrates forms into media galleries; it does not.
What it does
Squarespace's own Form Block can display as a lightbox, hidden behind one plain default button. With the snippet in place any element can open that same lightbox: a button block styled to match the page, a link inside a paragraph, an image or a header call to action. The form stays a native Squarespace form, so submissions, storage, notifications and Email Campaigns connections work as before, and nothing loads from a third party server.
Who it suits
Existing Toolkit members who want a "Get a quote" link in several places without repeating the form, and designers already using the Toolkit extension on client sites. A subscription for this one snippet is hard to justify on its own.
One honest caveat
You are paying for a subscription, not a plugin. Code stays if you cancel, but updates, the catalog and support stop. It also hooks into Squarespace's lightbox markup, so a future Squarespace change could need an updated snippet.
Setup
Sign in, open the snippet in the Code Catalog, add it through the Toolkit extension or code injection, then give your trigger the class or ID the snippet looks for. Code injection needs a Business (now Core) plan or higher; the snippet is written for Squarespace 7.1.
Related guide
Read my roundup of the best Squarespace plugins in 2026 or browse the plugins collection.
- Lets any button, link or image open a Squarespace Form Block lightbox
- Replaces the single default lightbox button with a trigger of your choice
- Keeps the form itself as a native Squarespace Form Block
- Included with a paid Will's Toolkit membership rather than sold separately
Full specifications
Specifications
Replaces the single default lightbox button with a trigger of your choice
Keeps the form itself as a native squarespace form block
Included with a paid will's toolkit membership rather than sold separately
Written for squarespace 7.1 and tagged under form block
No third party script; javascript on your own site
Installs through the toolkit extension or code injection
Last updated april 2025 according to the vendor page
Designers who already use the toolkit extension on client sites
Squarespace 7.1 sites that want one enquiry form opened from several places
Depends on squarespace's form lightbox markup, so future changes may need an updated snippet
Code injection needs a business or core plan or higher
Not a form builder: the form is still squarespace's own form block
Guides that go with Form Lightbox Trigger
Every template has limits. These are the guides we'd reach for next.
GuidesCan You Use Squarespace for Free? What the Free Trial Actually Gets You (2026)
Squarespace has no free plan, but its 14-day trial lets you build a whole site. Here is what the trial includes, what it locks, and what a site rea...Read more
DealsSquarespace Promo Codes, Discounts and Black Friday Deals (2026 Guide)
The genuine ways to pay less for Squarespace in 2026, checked against Squarespace's own pages: the official GIMME10 promo code, the 50% student dis...Read more
Guides