How to Trim Custom Printed Wallpaper

So, you’ve received your beautiful Mereton custom printed wallpaper — and you’ve noticed it has a white edge running along each side. Don’t worry, that’s completely normal (and intentional).

This white edge is part of the printing process and ensures your design is produced at the highest quality right to the very edge. Before you hang your wallpaper, it just needs a quick trim so that when the panels are applied, the design lines up seamlessly.

Here’s how to do it:

1. Lay it out flat – Place each panel on a clean, flat surface with plenty of space to work.
2. Use a sharp blade – A fresh craft knife or wallpaper trimming knife will give you the cleanest cut.
3. Use a long ruler – Invest in a 1m long ruler from Bunnings to help keep your knife moving in a straight line along the edge.
4. Trim both sides now… or just one – If you’re trimming all panels before installation, cut both white edges off each piece. But if you’re trimming while the paper is overlapped on the wall (as per our Installation Guide), you only need to trim one side laid out flat beforehand.
5. Take your time – Slow and steady is better than rushing. Clean edges mean clean joins on your wall.

Why trimming matters

Leaving the white edge on will cause visible lines in the finished wall, breaking up the seamless look of your mural or pattern. Trimming ensures every panel joins perfectly, so the final result looks polished and professional.

At Mereton, we want your wallpaper to be as easy to install as it is to love. With a little bit of prep, you’ll have a flawless, custom-printed wall that’s uniquely yours.