Free Shopify Tool

Shopify Checkout Extensibility Migration Checker

Find the legacy checkout customizations that broke at Shopify's 2026 extensibility deadlines, and what to rebuild.

This tool is pre-admin triage, not an authoritative audit. It scans the public storefront HTML in 30 seconds from outside your admin. The authoritative source is Shopify’s own Customizations Report at Settings, Checkout, Customizations Report once you log in.

The checkout deadlines have passed. Shopify Scripts, the legacy Ruby Script Editor on Plus, stopped running on June 30, 2026. August 26, 2026 was the deadline for non-Plus stores to upgrade their Thank you and Order status pages (Plus passed on August 28, 2025). Anything left in Additional Scripts, the Thank You page script box, or Order Status page scripts stopped firing, and stores that had not upgraded were upgraded automatically. Use this tool as a recovery check: find what broke or was auto-upgraded, then rebuild it. The next date is March 1, 2027, when Shopify stops injecting app script tags into storefronts.

This tool runs two layers of audit. The first scans your live storefront HTML for what actually renders to the page: apps still loaded through script tags, likely legacy customer accounts, and tracking tags in the theme (inline gtag and fbq, raw GTM containers, TikTok ttq, Pinterest pintrk, Klaviyo onsite, Postscript SDK, Attentive, Triple Whale, Bing UET, Recharge widgets). Theme tags were not affected by the checkout deadlines, so they show as tracking to move to Web Pixels / Customer Events, not as damage. The second layer is an Admin Verification checklist for everything the public HTML cannot reveal: Additional Scripts contents, Order Status scripts, Shopify Scripts entries, checkout.liquid edits. That is where the deadline damage lives. The tool cannot read your plan, so it assumes Basic, Grow or Advanced until you pick one.

Run the URL scan on your homepage, your highest-traffic PDP, and the cart page (the Full scan toggle does this for you in one pass). Each surface usually reveals different storefront patterns. Then walk the admin checklist for the rest. The full rebuild plan for non-Plus stores is in the non-Plus checkout extensibility playbook; for Plus, the Plus checkout optimization guide, the checkout optimization guide, and Scripts migration examples cover the rebuild patterns.

The authoritative source for legacy customizations on your specific store is Shopify admin: Settings, Checkout, Customizations Report. The help.shopify.com upgrade guide walks through running it. Primary sources for the migration paths: shopify.dev Web Pixels API and shopify.dev Functions API. Read those before you start the rebuild; the public-HTML scanner here is a triage screen, not a substitute for the merchant admin walk-through.

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FAQ

Frequently Asked Questions

What does this tool actually detect?
It scans the public HTML of any Shopify storefront URL for the migration signals that actually render to the page: inline gtag, raw fbq() outside the noscript fallback, GTM containers, TikTok ttq, Pinterest pintrk, Snapchat snaptr, Impact affiliate pixels, Hotjar and Clarity inline init, Klaviyo onsite, Postscript SDK, Attentive, Triple Whale, Bing UET, Recharge widget. Those theme tags were not touched by the checkout deadlines, so they show as informational items to move to Web Pixels / Customer Events, with no deadline and no hours. It also lists apps still loaded through script tags (Shopify stops injecting them on March 1, 2027), likely legacy customer accounts, and the single reliable green flag: Shopify Web Pixels Manager active (which means Customer Events is running and any installed channel app like Google, Meta, TikTok, Pinterest, Snapchat is migration-safe). Verify the specific channel apps in admin at Settings, Customer Events. Anything that lives only in admin (Additional Scripts, Order Status scripts, Shopify Scripts, checkout.liquid) cannot be detected from the outside; the tool surfaces those in a separate Admin Verification panel as a checklist with manual verification steps.
What changed on August 26, 2026 for non-Plus stores?
August 26, 2026 was the deadline for Basic, Grow, and Advanced stores to upgrade their Thank you and Order status pages. Script tags on those pages were sunset that day, so anything in Additional Scripts, the Thank You page script box, or Order Status page scripts stopped firing. Stores that had not upgraded were upgraded automatically, so those scripts are gone, not paused. The Additional Scripts box has been view-only since August 28, 2025, so it cannot be edited back. Plus stores hit their version of this deadline on August 28, 2025. If your GA4 tag, Meta pixel, or COD validator lived in a legacy script field, it is not running now. The rebuild plan is in my non-Plus checkout extensibility post.
How is this different from migrating Shopify Plus to Checkout Extensibility?
Plus migration was about checkout.liquid replacement and custom UI extensions. Non-Plus migration is mostly about tracking and validation. Most Basic/Shopify/Advanced merchants never touched checkout.liquid (it required Plus). What they did do is paste tracking scripts into Additional Scripts, build COD validators in JavaScript, and rely on Order Status page scripts for affiliate conversions. That is what stopped working on August 26, 2026. The replacement APIs are the same (Customer Events, Web Pixels, Shopify Functions, Customer Account UI Extensions), but the migration scope is different. This tool ranks findings against the non-Plus playbook.
What breaks if the legacy scripts were never rebuilt?
Tracking goes silent. Conversion data stops flowing into GA4, Meta Ads Manager, TikTok, and any platform whose pixel was pasted as raw code. Validators stop running, so a Cash on Delivery rule that previously blocked $500+ orders will accept them. Affiliate scripts on the Order Status page stop attributing. The store keeps selling because checkout itself does not break. But the analytics and CRO tooling that founders depend on for paid marketing decisions, attribution, and basic accounting goes dark with no rollback. The usual first sign is GA4 conversions dropping to zero from August 26, 2026. Run the scan and the admin checklist to see what needs a rebuild.
What does this tool NOT detect from public HTML?
Anything behind admin-only surfaces. Additional Scripts content, Thank You page scripts, Order Status page scripts, Shopify Scripts (Ruby Script Editor, Plus only), checkout.liquid customizations, Customer Account UI Extensions, Checkout UI Extensions, Shopify Functions, Post-Purchase extensions. None of these render on the public homepage; the storefront-facing scanner has no way to see them. The tool flags those items as a manual checklist in the Admin Verification panel with the exact admin path to open. Treat the public-HTML scan as a triage screen and the admin checklist as the authoritative audit. The Shopify checkout optimization guide covers the deeper migration playbook. If you have admin access, run the official Customizations Report at Settings, Checkout. This tool is the screen for everyone else: agencies, partners, and devs evaluating prospect stores.
Is there still a deadline coming?
The checkout deadlines have passed. Shopify Scripts stopped running on June 30, 2026, and August 26, 2026 was the non-Plus deadline for the Thank you and Order status pages. The one date still ahead is March 1, 2027, when Shopify stops injecting app script tags into storefronts; the tool counts down to it and lists any app still using them. Everything checkout-side is now a recovery item. For most non-Plus merchants, rebuilding a DOM-dependent script (custom GA4 events, COD validators, affiliate scripts) takes two to five weeks of developer time, so start with whatever feeds your paid marketing decisions.
What about Shopify Scripts (Ruby Script Editor) on Plus stores?
Editing and publishing Scripts stopped on April 15, 2026, and every Script stopped running on June 30, 2026. Shopify’s Scripts customizations report in admin shows what each one did. The tool surfaces this as a manual admin verification item: the actual Script Editor entries (cart.scripts, line_item.script_discount, shipping_rate.script_discount, payment_gateway.script) live behind the admin and never render in storefront HTML. Open Apps > Script Editor in your Plus admin to see which rules were live. Most Plus stores had at least one Script (BOGO, line item discount, shipping rule) that quietly stopped working on June 30 if it was not rebuilt as a Shopify Function. The Shopify Scripts deprecation guide and real examples post walk through the conversion patterns.

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