Built around the print file you already approved.

The wedge

Print shops, corporate marketing teams, and the agencies that serve them sit on finished press-ready PDFs — business cards, letterheads, badges, postcards, sell sheets — and constantly need versions of them. One per employee, one per office, one per rep, one per event.

Today that versioning is done by hand. The only tools that automate it are web-to-print platforms that demand the shop recreate every design inside the platform first. That recreation tax is so painful it kills adoption — most shops keep editing files by hand.

StackFill removes the recreation step. The shop uploads the PDF it already has. In a few clicks it marks which elements are editable and locks the rest. It gets a hosted link — later, an embed on its own site — where a customer fills in the editable fields, optionally pays, and downloads a print-grade CMYK PDF that matches the original exactly.

How we think about the problem

• The preview the customer approves and the file the press runs must be the same thing. No "we'll render the final after checkout" surprise.
• CMYK, trim, and bleed are first-class. Color drift between screen mockup and finished card is a bug, not a feature.
• The shop's existing artwork is the source of truth. We don't ask anyone to rebuild a letterhead in a new design tool.
• Hosted links and white-label embeds are the same primitive — the customer experience is the customer experience, regardless of where the link lives.

What we're not

• Not a design tool. You don't start from a blank canvas in StackFill.
• Not an e-sign or generic PDF form. We produce print-grade CMYK output for offset, digital, and large-format presses.
• Not a storefront or print MIS. We drop into the one you already have.
• Not a template marketplace. Your file is the template.

Who's building it

StackFill is a product from Parameter LLC — the same team behind PreArrive and Letterhead Lab. Built for the print trade by people who've watched too many shops eat the cost of variant-by-variant editing.

We're a small team. Roadmap input from print shops, marketing leads, and agencies is welcome — drop us a line.