Tired of spending hours on theme customizations?
Edit Your BigCommerce Theme in Minutes, Not Hours
Just describe what you want changed in plain English. Our AI edits your Stencil theme files and shows you a live preview instantly.
"Change the header background to navy blue and make the logo 20% larger"
Done! I've updated templates/components/common/header.html and assets/scss/header.scss. Your preview is ready.
Sound Familiar?
Theme customization shouldn't be this painful.
"I spent 4 hours just changing colors"
Hunting through dozens of SCSS files to find the right variable is exhausting.
"Local Stencil setup took forever"
Installing Node, CLI tools, and fighting with dependencies just to preview a small change.
"Developer fees are killing me"
Paying $150/hour for simple tweaks adds up fast when you're a small store.
The Solution
AI That Understands Stencil Themes
ThemeClerk was built specifically for BigCommerce. It knows your theme structure inside and out.
Plain English Commands
No code required. Just describe what you want: "Add a sticky header" or "Make the product images larger on mobile."
Instant Live Preview
See your changes in seconds on a real preview URL. Share it with clients or your team before going live.
One-Click Deploy
Happy with the changes? Deploy directly to your BigCommerce store or download the modified theme ZIP.
Secure & Isolated
Your theme runs in an encrypted container. Files are automatically deleted after your session. Your code stays yours.
Dead Simple
3 Steps. 5 Minutes. Done.
Upload Your Theme
Drag and drop your theme ZIP file. We support all Stencil themes including Cornerstone.
Describe Your Changes
Type what you want in plain English. The AI handles the technical details.
Preview & Deploy
Review your live preview. Download or deploy to your store when ready.
Loved By Store Owners
What Our Users Say
"Saved me $2,000 in developer fees. I made all my Black Friday theme updates in one afternoon."
Marcus R.
Fashion Boutique Owner
"I'm not technical at all, but I customized my entire homepage in an hour. This is a game changer."
Sarah K.
Home Goods Store
"As a developer, I use this to prototype changes for clients. They love seeing live previews before approving work."
Simona S.
BigCommerce Developer
Common Questions
Is my theme code safe?
Yes. Your theme runs in an isolated, encrypted container. We don't store your code after your session ends, and all data is automatically deleted. Your credentials are encrypted with AES-256.
What themes are supported?
All BigCommerce Stencil themes are supported, including Cornerstone and any custom themes. Just upload the ZIP file exported from your BigCommerce store.
Do I need to know code?
Not at all! Just describe what you want in plain English. The AI understands Stencil theme structure and handles all the technical edits for you.
How much does it cost?
You can try ThemeClerk for free with your first preview. After that, we offer pay-as-you-go pricing based on AI usage. Most simple edits cost less than a cup of coffee.
Can I deploy changes directly to my store?
Yes! Connect your BigCommerce store via OAuth and deploy with one click. You can also download the modified theme ZIP to upload manually.
Stop Struggling With Theme Code
Join 300+ store owners who've already saved hundreds of hours on theme customization.
Start Your Free PreviewNo credit card required. Set up in 60 seconds.