How PrntFlow Works

1

Install & Authorize PrntFlow

Install PrntFlow (POD Mockup Uploader) from the Shopify App Store. During setup, the app will request access to:

Products & Variants – to read your t-shirt products and their color variants
Product Media – to upload and assign generated mockup images

We do not access orders, customers, or payment details. All billing is handled through Shopify's billing system.

No special setup is required. Install the app, approve permissions, and you're ready to create your first template in a few clicks.

One-click authorization via Shopify OAuth

Secure, scoped permissions (products and media only)

No separate login or credit card needed to start

2

Select a T-Shirt Product & Pull Its Colors

To create a template, start by choosing a t-shirt product in your Shopify store. This new template inherits the colors offered by this product.

From within the app, you can:

Search by product title – quickly find the tee you want to base your template on
See available colors – each color variant on the product becomes an available color in the template

PrntFlow works with:

T-shirt products created directly in Shopify, and
T-shirt products synced from POD platforms like Printify or Printful, as long as they appear as normal Shopify products with color variants.

Example Workflow:

→ Search for your best-selling t-shirt product

→ Select it to pull in its color variants (for example, black, white, red, yam)

→ Those colors become the variant colors for a reusable template you can apply to other designs

3

Upload Base Mockups & Set Light/Dark Groups

Once you've selected a t-shirt product and pulled in its colors, PrntFlow lets you upload a base mockup image for each color variant.

Drag and drop your t-shirt mockup PNG/JPG files into PrntFlow
Assign each base mockup to a specific color (for example, black, white, yam)
Optionally group colors into:
- ◦ Dark shirts – colors that work best with light graphics or text
- ◦ Light shirts – colors that work best with dark graphics or text

This lets you:

Reuse one proven mockup style across many colors
Prepare the template so you can later use one design for all colors, or separate designs for light and dark shirts.

Upload Progress:

Base mockups uploaded

Colors mapped (black → black mockup, yam → yam mockup, etc.)

Optional light/dark groups configured

Template ready for placement and placeholder setup

4

Place a Placeholder Image & Save the Template

With your base mockups and colors set, the next step is to define how your design should appear on the shirt. You do this once per mockup style by using a placeholder image.

In PrntFlow, you can:

Upload a placeholder image
For example, a sample t-shirt design or brand logo
Use the in-app visual editor to:
- ◦ Drag and position the graphic on the base mockup
- ◦ Adjust scale so the design sits correctly on the chest area
- ◦ Choose between flat placement or a look that follows shirt folds for more realistic printed on fabric results
Optionally apply visual enhancements (such as displacement and related effects) so the final mockups match your brand style

Once you're happy with placement and look, save the template.

This template captures:

Which colors are available
Which base mockup belongs to each color
How your design should be placed and rendered on the shirt

You can reuse this template with any new design graphic, across many t-shirt products and color variants.

Template Snapshot:

Placeholder image placed and scaled

Placement and look saved per template

Ready to apply to products with real designs

5

Apply the Template & Publish to Shopify

Once a template is saved, you can apply it to real products and designs in just a few clicks.

In PrntFlow, you:

Select a t-shirt product
- ◦ Search by product title inside the app
- ◦ Choose your product with multiple color variants (for example, black, white, red, yam)
Choose the template
- ◦ Select the template you created earlier
Upload the design graphic(s)
- ◦ Upload a single design graphic to use on all colors, or
- ◦ Upload one graphic for dark shirts and another for light shirts if you need different artwork for each group
Apply it
- ◦ Click to apply; PrntFlow then:
  - • Uses your placement, scale, and color mappings
  - • Generates new merged mockup images for each color
  - • Uploads those mockups to Shopify via the Product Media API
  - • Assigns the correct mockup to each color variant automatically

No manual product edits are needed. Your Shopify product now has variant-specific mockup images based on your tested mockup style.

Example Publishing Flow:

Product selected:

"Summit Club Tee" (Black, White, Forest Green)

Template assigned:

"Monster 1717"

Design uploaded:

peak-graphic.png (dark shirts) + peak-graphic-light.png (light shirts)

Result:

✓ Mockups generated for each color
✓ Images uploaded to product media
✓ Correct mockup assigned to each color variant

Real-time Publishing Progress:

Uploading to Shopify 4/6

Status: Uploading...

6

What's Next: From Single Products to Full Catalog Swap (Roadmap)

Right now, PrntFlow's core job is simple:
Turn your winning t-shirt mockup into a reusable template and automatically generate, upload, and assign mockups to every color variant - product by product.

As you use the app, each product that goes through PrntFlow has its design graphic(s) saved available for future use. That means the app knows which design belongs on which t-shirt, without you needing to re-upload those files for future updates.

We're building on that foundation to automate more of the "last mile" before a product goes live, including:

Bulk re-generation with new templates

Once products have been processed by PrntFlow and their design graphics are stored, you'll be able to choose a new template - a new winning mockup style - and reapply it across all those products (or a collection) in a single action, without re-uploading designs per product.

Alt text for all generated images

Automatically add meaningful, SEO-friendly alt text to all mockup images created by the app, so your catalog is more accessible and better structured for search.

AI-assisted product finishing

Before a product can go live, it needs more than a mockup. PrntFlow uses your design graphic, product title, and store niche with the power of AI to generate:

A unique Google product title
A unique Google product description
Google category metafields (fabric, neckline, age group, target gender, and more)

Everything you need to flip a product from draft to live, without writing a single line of copy.

Our goal is to evolve PrntFlow from "mockup automation for a single product" into a tool that can restyle entire t-shirt catalogs and handle most of the final finishing steps - mockups, alt text, and key product content - from one place.

(Roadmap items are in development and may change as we learn from real sellers.)

Common Questions

Does PrntFlow provide mockups, or do I bring my own?

PrntFlow works with your own mockup images. You bring the base t-shirt mockups you've already tested and proven - for example, in Meta ads - and PrntFlow handles applying that winning look across your products and color variants. We don't supply a stock mockup library.

How does PrntFlow change my images?

PrntFlow creates new merged mockup images by combining your base t-shirt mockup, your design graphic, and the placement and scale you defined in your template. Those merged images are uploaded to your Shopify product media and assigned to the correct color variants. Your original base mockups and design files are never modified.

What happens if I update a design or want a new mockup style?

You have two options:

New design, same mockup style:

Use your existing template, upload a new design graphic, and apply it to the product. PrntFlow generates, uploads, and assigns fresh mockups based on your saved template.

New mockup style:

Create a new template from a different winning mockup and apply it to your products using the same stored design graphics. As more products go through PrntFlow, bulk re-application across your catalog is coming - see Roadmap.

Does PrntFlow work with Printify or Printful products?

Yes. PrntFlow works with any Shopify t-shirt product that has color variants - whether created manually in Shopify or synced from a POD platform like Printify or Printful. As long as the product appears in Shopify with color variants (for example, Color: Black, White, Red, Yam), PrntFlow can use it.

Is PrntFlow only for t-shirts?

PrntFlow is designed and tested specifically for t-shirt products with color variants and chest-area graphics. Other apparel set up the same way in Shopify may also work, but the app is built and optimized around the t-shirt workflow.

What image formats can I use?

For base mockup images: PNG and JPG are both supported.

For design graphics: PNG is requires as it supports transparency and produces clean results.

Is there a limit on how many mockups I can generate?

No limits on the Launch plan. Generate mockups for as many products and color variants as you need. Higher tiers unlocking bulk operations across larger catalogs are coming soon.

What happens if I uninstall the app?

All mockup images generated by PrntFlow are uploaded directly into your Shopify product media and assigned to your variants. If you uninstall, those images and assignments stay in Shopify - nothing breaks and nothing disappears. You just won't be able to generate or update mockups through PrntFlow going forward.