Key takeaways
- There are three ways to edit a Shopify theme: the built-in Theme Editor, the code editor, and an AI tool like Fudge.
- The Shopify Theme Editor handles most visual changes - colors, fonts, sections - without writing a single line of code.
- Editing theme code directly gives you full control, but requires Liquid and CSS knowledge and carries real risk of breaking things.
- Fudge lets you describe what you want in plain English and generates the code for you - nothing goes live until you approve it.
- Most everyday store changes don’t need a developer.
To edit a Shopify theme, go to Online Store → Themes and click Customize for the visual theme editor, or click the three-dot menu (…) next to your theme, then Edit code for the files. A third option is an AI editor like Fudge, which writes the code change as a draft.
This guide walks through all three: what each one does, when to use it, and how to do each.
Why you can trust us
Jacques has over 15 years of software development experience and has worked with many Shopify brands on their storefronts. We’ve been in the Shopify ecosystem for four years, working directly with hundreds of merchants. We also build Fudge, the AI operator for Shopify stores, with a 4.9 rating on the Shopify App Store.
The 3 ways to edit a Shopify theme
Not all theme edits are equal. The method you use should match what you’re trying to change.
1. The Shopify Theme Editor (no code)
This is Shopify’s built-in visual editor. It covers most day-to-day changes - colors, fonts, section order, images, layout toggles - with a live preview as you make them.
No code required. Anyone on your team can use it.
2. The Shopify code editor (for developers)
Shopify also gives you direct access to your theme’s Liquid, HTML, CSS, and JavaScript files. This unlocks anything - but it requires technical knowledge, and one mistake can break your storefront.
Most merchants don’t need to go here.
3. An AI store editor like Fudge (no code, more control)
Fudge sits between the two. You describe what you want in plain language, and Fudge generates the code changes directly in your theme. Drafts are created first - nothing goes live until you’ve reviewed and approved it.
For smaller edits, see how to edit text on any page in Shopify and how to update colors and fonts in Shopify.
How to use the Shopify Theme Editor
Where to find it: Shopify Admin → Online Store → Themes → click “Customize” on your active theme.
You’ll see a live preview of your store on the right, and a sidebar on the left listing your sections and settings.
What you can change
- Colors and fonts - global color schemes and typography that apply across your whole store
- Sections - add, remove, reorder, or hide sections on any page
- Blocks - edit individual elements inside sections: text, images, buttons, headings
- Theme settings - logos, favicons, social links
- App embeds - connect compatible apps (reviews, chat, badges) without touching code
- Device preview - check how everything looks on mobile and tablet before publishing
What you can’t change
The Theme Editor is limited to what your theme developer has chosen to expose.
If the option isn’t in the editor, it’s not available through it. Custom layouts, new section types, and anything involving JavaScript all fall outside its scope.
For those changes, you need the code editor - or Fudge.
How to edit your Shopify theme code directly
Where to find it: Shopify Admin → Online Store → Themes, click the three-dot menu (…) next to your theme, then Edit code.
This opens a file browser of your entire theme. Here’s what the main folders contain:
| Folder | What it does |
|---|---|
assets/ | CSS stylesheets, JavaScript files, fonts |
sections/ | The modular blocks you see in the Theme Editor |
templates/ | Page templates - product, collection, blog, and others |
layout/theme.liquid | The global wrapper around every page |
snippets/ | Reusable Liquid/HTML chunks used across the theme |
config/ | Theme settings schema and saved values |
Shopify’s code editor has built-in Theme Check - a linter that flags errors in real time with red underlines. It won’t catch everything, but it catches a lot.
Before you edit any code
Always duplicate your theme first. Go back to the Themes page, click the three-dot menu (…) next to your theme, then Duplicate. This gives you a backup you can restore instantly if something goes wrong.
When code editing makes sense
Code editing is worth doing if you have Liquid or CSS knowledge and you’re making a targeted, well-understood change - like adjusting a CSS value or adding a small snippet.
For anything more complex - new sections, new layouts, custom components - the risk of breaking things rises fast.
For how this compares with the theme editor, see the Fudge store editor.
How to edit your Shopify theme with Fudge
Fudge is the AI operator for Shopify stores, and editing your theme is one of the things it does. Instead of editing files manually, you describe what you want.
“Add a before/after comparison section to my product page.”
“Create a landing page for our summer sale with a hero banner and three feature blocks.”
“Move the size guide above the add-to-cart button.”
Fudge generates the changes as a draft - native Shopify Liquid, HTML, and CSS that integrates directly with your theme. You review what’s been done. Nothing goes live until you approve it.
Each published change keeps the version it replaced, so you can roll it back, and Fudge shows the numbers on the pages it changed before and after the change went live.
What makes this different from a page builder
Most page builder apps create pages inside their own system, separate from your theme. This can slow your store down and creates a long-term dependency on the app.
Fudge writes directly into your Shopify theme. If you ever stop using Fudge, the code stays. Your store doesn’t break. And because the same tool also builds landing pages, quizzes, popups and bundles, it can replace several single-purpose apps, not just a page builder.
What Fudge is best used for
- Custom product page layouts
- Campaign landing pages
- Conversion elements - countdown timers, urgency banners, product comparisons
- Any change where the Theme Editor doesn’t have the option you need
- Working out what to change in the first place: give it a goal, like more conversions, and it finds and ranks the opportunities before building anything
Common edits - and the fastest way to do each
| What you want to change | Fastest method |
|---|---|
| Colors and fonts | Theme Editor |
| Add or reorder homepage sections | Theme Editor |
| Swap out images and logos | Theme Editor |
| Custom product page layout | Fudge |
| Build a campaign landing page | Fudge |
| Add a custom conversion element | Fudge |
| New section type from scratch | Fudge or developer |
| Custom checkout logic | Developer |
What can you edit without a developer in 2026?
The Theme Editor alone covers colors, fonts, section order, images, and most layout settings. For everyday visual changes, that’s enough.
With Fudge, that range expands significantly. Custom page layouts, new sections, conversion elements, landing pages - all without writing code or waiting on a developer.
The cases where you still genuinely need a developer are narrower than they used to be: complex third-party integrations, custom checkout functionality, and highly bespoke interactive features.
For everything else - the tools are there to do it yourself.
FAQ
Will Shopify theme updates overwrite my customizations?
It depends on what you edited. Theme settings, sections, and content saved via the Theme Editor are preserved across updates. Direct edits to theme files (assets/, sections/, templates/) are overwritten when you update the theme — Shopify treats updates as a fresh install. To preserve code edits, document them or use Shopify's GitHub integration for version control.
Should I edit the live theme directly or duplicate first?
Always duplicate first if making structural edits (code, section deletions, template changes). For Theme Editor changes you can preview without saving. Duplication takes 30 seconds and gives you a complete restore point. Once edits are tested, you can publish the modified theme as the new live theme.
What's the difference between the Theme Editor and the code editor?
Theme Editor is the visual customizer — drag-drop sections, colors, fonts, content. Code editor (Online Store → Themes → ... → Edit code) shows the underlying Liquid/HTML/CSS/JS files. Theme Editor changes are merchant-friendly and reversible; code editor changes can break the storefront if done wrong. Fudge sits between the two: describe the change in plain English and it generates the code (custom sections, conditional logic, custom layouts) as a draft you can preview and approve — the merchant-friendly path to changes the Theme Editor can't make.
Can I revert theme changes after saving?
The theme editor has no undo after you save, but the code editor keeps older versions of every file, including the template JSON that stores theme editor settings. Open the file in Edit code and choose Older versions to restore it. For a full history, connect the theme to GitHub.
Will editing my Shopify theme break my apps?
App embeds and most modern apps coexist cleanly with theme edits. Risk is highest when (1) you delete sections that an app injects content into, (2) you remove app code blocks during code edits, or (3) your theme update reverts app-injected snippets. After significant edits, test apps that touch the storefront (reviews, search, cart drawer).
