What a Smart Object mockup is, and how to check yours has one
Every batch mockup tool depends on the same thing: a layer in the PSD whose contents can be swapped without touching anything else in the file.
Last checked against the platform's own documentation on 22 September 2026.
- What it is
- A layer that holds another document inside it
- Why mockups use it
- The scene's lighting and perspective survive the swap
- How to spot one
- A small page icon in the corner of the layer thumbnail
- Photoshop menu
- Layer › Smart Objects › Replace Contents
- File types inside
- Another PSD, a JPEG, a PNG, or vector art
The idea
A Smart Object is a layer that contains a separate document. When you open it, Photoshop opens that inner document in its own tab. Save it, and the outer file updates to match — keeping every transform, mask, shadow and blend mode that was applied to the layer.
That last part is what makes mockups work. The person who built the template placed a rectangle where the artwork goes, skewed it to match the wall's perspective, then layered glass reflections and an inner shadow on top. All of that is attached to the layer, not to the picture inside it. Swap the contents and your artwork inherits the whole arrangement.
How to tell whether your PSD has one
Open the file and look at the Layers panel. A Smart Object layer has a small
page-corner badge on its thumbnail that ordinary layers do not have. Names vary
by seller — YOUR DESIGN HERE, Place your art,
Artwork, Smart Object — so go by the badge, not the
name.
Two quicker checks:
- Double-click the layer thumbnail. If a new tab opens with a separate document, it is a Smart Object.
- Right-click the layer. If the menu includes Replace Contents, it is a Smart Object. If it does not, it is not.
What good mockup templates have in common
- One obvious placeholder. Some templates contain several Smart Objects — a frame, a wall texture, a lamp — and only one of them is for your artwork. Templates that name theirs clearly are easier to automate.
- The placeholder is the right shape. A portrait placeholder will letterbox a landscape photograph. Match the orientation of the template to the orientation of the work.
- Effects live outside the Smart Object. Shadows and reflections applied to the layer survive a swap. Effects baked into the pixels inside it will be replaced along with everything else.
When there is no Smart Object
Occasionally a template is a flattened image with the artwork already burned in. There is no placeholder and nothing to swap. You can build one: select the area where the artwork sits, create a new layer, convert it to a Smart Object, and transform it to match the perspective. It takes a few minutes per template, once — after that it behaves like any other mockup.
Replacing contents by hand
- Select the Smart Object layer in the Layers panel.
- Layer › Smart Objects › Replace Contents, and choose your artwork.
- Photoshop drops the new file in at the same transform. If the aspect ratio differs, it will sit inside the placeholder rather than filling it.
- File › Export › Export As, and save as JPEG or PNG.
Repeat for every artwork, in every template. Ten designs across twenty templates is two hundred repetitions of those four steps, which is the point at which most people go looking for a way to automate it.
Doing this across a whole catalogue
Auto Mockup Studio does those four steps for you, across every combination of artwork and template, in your own copy of Photoshop. It finds the Smart Object on its own, or you can name the layer if a template has several. Your PSDs are opened read-only and never saved over.
See how it works