Updated September 2026
Starting an online store is exciting and a little overwhelming. Shopify's step-by-step guide to starting an online store is a good place to begin: it covers creating your store, adding products and choosing a theme. But once the basics are done, most store owners hit the same question: how do I make this store look and work like mine?
That's customization. It's what turns a working store into one that fits your brand and your customers. This guide explains the three layers of customization on Shopify, what you can do yourself at each one, and when it's time to bring in help.
Why customization matters
Your store's design and features should reflect your brand. A store that's easy to navigate, highlights your best products and removes friction at checkout makes buying easier, and that's what customization is for. It isn't about adding as much as possible. Every section, app and script should earn its place, because each one also adds weight to your pages.
The three layers of customization
1. The theme editor: no code
Shopify's theme editor handles far more than colors and fonts. You can add, remove and reorder sections, create templates for different kinds of products or pages, and edit menus. In Shopify's Horizon themes, theme blocks can be placed in any section and nested inside each other, so you can build layouts that used to need a developer. The editor can even generate a custom block from a description.
Things worth doing here before anything else:
- Set your brand colors and fonts once, in theme settings, rather than section by section.
- Plan your navigation around how customers shop, not how your warehouse is organized.
- Make a separate product template for products that need extra information, such as size guides or care instructions.
- Check every page on your phone. Most of your shoppers will see it there first.
2. Apps: features without code
When you need a feature your theme doesn't have (reviews, wishlists, product bundles, a store locator, extra product options), an app is usually the answer. Modern apps plug into your theme as app blocks you place in the theme editor, or as app embeds you switch on, so they don't need theme code edits and are removed cleanly if you uninstall.
A few rules we follow:
- Check whether Shopify already does it. Built-in features improve every year, and some once-essential apps are now redundant.
- Prefer apps that use app blocks and embeds over ones that ask you to paste code into your theme.
- Add apps one at a time and check your store's speed after each one. Our post on why apps can slow down your store explains how.
We build Shopify apps ourselves, including Wishlists, Store Locator and Product Options, so we're biased, but the same rules apply to ours.
3. Custom code and custom apps
Some things only custom work can do: a layout your theme can't produce, an integration with your warehouse or ERP, a rule that's unique to how your business runs. That's where a developer edits your theme code or builds a custom app just for your store. Our guide to apps, custom code or something in between helps you decide which you need.
Customizing your checkout
Checkout is the one place where Shopify limits what you can change, for security and speed. On every plan you can brand your checkout (logo, colors, fonts) in the checkout and accounts editor and choose which payment methods and delivery options to offer. Adding your own content or app features inside the information, shipping and payment steps requires Shopify Plus. On other plans, checkout apps can add content to the Thank you and Order status pages. Our guide to customizing the checkout page goes into detail.
SEO and performance
Customization and speed are linked. Every image, section, app and script adds to your page weight. Use properly sized images, keep sections to what each page needs, and remove apps you no longer use (including any leftover code they left in your theme). For search, give each product and collection a clear title and meta description. Our beginner's guide to SEO for Shopify stores covers the essentials.
When to bring in help
You'll know it's time when you keep bumping into what your theme can't do, when an app conflict breaks something and you can't tell why, or when you're spending more time fixing the store than running the business. That's the work we do at Pasilobus: theme customization, app setup and integrations, performance work and custom apps, plus monthly store care for merchants who want someone keeping an eye on things. If you've finished the basics and want to take your store further, talk to us.