Shopify Amazon integration that keeps one stock count
Shopify connects to Amazon through an app: Shopify’s free Marketplace Connect when Shopify is your only hub, a sync app when other shops hold the same stock. For Shopify sellers who also sell on Amazon. Amazon truncates a SKU at 20 characters, the tightest limit of the eleven channels we connect, and it keeps its own count for anything held in FBA: we always send your stock, and take changes back only for the items you ship yourself. Both sides tell us the moment something sells, so the other is corrected in a second or two.
From $19 a month for two shops · no credit card · connected in about ten minutes · nothing changes until you say so · Updated 22 August 2026
Shopify
AmazonHow to connect Shopify and Amazon
Four steps and about ten minutes. The two connections are a login each; most of the time is us matching your catalogues, and nothing changes until you switch it on.
Connect Shopify
You approve QuickSync from the Shopify app store. Shopify asks which permissions to grant and you can withdraw them from the Shopify side at any time.
Connect Amazon
You authorise QuickSync in Seller Central for the marketplaces you sell in.
Let it match your products
We line the two catalogues up by SKU, then by title, and hand you a short list of anything we could not match. You decide what happens to those.
Watch, then switch it on
Leave it watching for a few days and check the numbers agree. When you are happy, let it start making changes, one shop at a time.
Ways to connect Shopify and Amazon
The ways to put one number behind both shops, and what each one gives up.
| Route | What moves | What it costs | Where it stops |
|---|---|---|---|
| Shopify Marketplace Connect | Listings, stock and orders between Shopify and Amazon, with Amazon hanging off the Shopify admin | Free to install. The first 50 marketplace orders a month cost nothing, then 1% of each synced order, capped at $99 a month | The day something that isn’t Shopify also holds stock: a till, an Etsy shop, a QuickBooks count |
| By hand | Whatever you retype, as often as you retype it | Your time, every morning, in both dashboards | The Saturday the last one sells on Shopify and Amazon in the same hour |
| QuickSync | Stock in both directions in a second or two, prices with your rule applied, and every order from both shops | $19 a month for two shops on Lite, after a 14-day trial with no card | Stock Amazon ships itself (FBA) keeps its own count |
What a Shopify Amazon integration actually moves
One row per job, based on how QuickSync connects to Shopify and Amazon today. Where a side does not allow something, the cell says so.
| What | Shopify | Amazon |
|---|---|---|
| Stock count | Both ways | We always send, and hear back for items you ship |
| New listings | We can create and update | We can create and update |
| Prices | Sent, with your rule applied | Sent, with your rule applied |
| Orders in | Into QuickSync | Into QuickSync |
| Tracking back | Sent to the order | Amazon does not accept one from us |
| Photos and options | Photos, sizes and colours | Photos, sizes and colours |
| How fast we update it | Under a second | A second or two |
| How fast it tells us | The moment it happens | The moment it happens |
Running Shopify and Amazon by hand
Nearly every problem selling on both Shopify and Amazon comes from each side keeping its own count. Sell the last one twice and you oversell somebody.
| Two shops, run by hand | Two shops, connected |
|---|---|
| The last one sells in both shops within the same hour | Whichever shop sells it, the other one drops to match |
| Typing the same stock numbers into Shopify and Amazon each morning | One count, sent to both, without anyone opening a spreadsheet |
| Changing a price means editing the same product twice | Change it once and each shop gets the price you set for it |
| Orders in two dashboards, matched up by hand at the end of the week | Every order already matched to the right product |
| A refund leaves your numbers wrong until someone notices | A refund puts the stock back and tells both shops |
| Guessing how stale each shop’s number is | A sale on either shop reaches the other in a second or two |
One Amazon order, start to finish
Real timings, second by second.
Amazon · order #447114:02:11Amazon41sourceShopify41+0.3sCorrecting Shopify takes under a second once we have the sale. The order is in your packing list with the Amazon order number on it.
The other direction is the same: a sale on Shopify reaches Amazon just as quickly, because Shopify pushes it to us the moment it happens too.
The limits: know them before you connect
Every Shopify Amazon integration has constraints. These are the ones that apply here.
Quick between Shopify and Amazon
Both Shopify and Amazon tell us the moment something sells, so a sale in one is reflected in the other in a second or two. There is no polling gap on this pair.
Stock Amazon holds is left alone
We always send your count to Amazon, but we only take changes back for items you ship yourself. Anything Amazon stores and ships keeps its own count, which is Amazon’s to own.
Nothing publishes itself to Shopify or Amazon
Copying a listing from Shopify to Amazon (or the other way) always waits for you to look at it. Stock is the only thing that moves on its own, and only once you have turned it on.
Shopify already gives you a free Amazon app
Start there. This is the point where a separate tool starts to earn its keep.
Shopify Marketplace Connect, which used to be called Codisto, is free, built by Shopify, and links your catalogue to Amazon from inside the Shopify admin. If Amazon is the only other place you sell, it is the obvious thing to try first, and we would rather you tried it than paid us to find out the same thing.
What it is built around is Shopify. Your listings, your stock and your orders live in the Shopify admin, and Amazon hangs off that as a channel. This works well while Shopify is the centre of the business. It stops working the day something that is not Shopify also holds stock: a Square or Clover till at a market stall, an Etsy shop, a count someone keeps in QuickBooks. Two channel apps both plugged into Shopify have no way to tell each other anything.
That is the split worth settling before you pick either. One shop with one marketplace attached is a job for the free app. Several places that each sell the same physical item need one count held somewhere in the middle that belongs to none of them. QuickSync is the second shape, which is also why we are not trying to be a cheaper Marketplace Connect.
Amazon cuts a SKU off at twenty characters
The tightest limit of any channel we support, and the one that quietly breaks matching.
Shopify will hold a SKU up to 255 characters long. Amazon takes 20. That gap is the most common reason a Shopify and Amazon sync looks connected and still moves the wrong numbers, because the SKU is what identifies the item on both sides and a truncated one stops matching the thing it came from.
Twenty characters goes fast if you build SKUs out of words. WINTER-JACKET-NAVY-XL is 21 and already over the line. We truncate at the channel’s limit on the way out rather than refusing to send, so nothing errors and nothing turns red: the item simply stops pairing up with itself, and you find out when a count drifts.
So check your longest SKUs before you connect rather than after. If they are built from a pattern, shortening the pattern once at the start costs a great deal less than reconciling two counts later. This is worth doing whichever tool you end up using, because the 20-character limit is Amazon’s rather than ours.
Which way stock moves depends on who ships it
We always send your count to Amazon. What we take back is the part that differs.
We send your stock figure to Amazon whatever the fulfilment method, so a sale on Shopify lowers what Amazon shows either way. The direction that changes is the one coming back. For items you pick and post yourself, we hear about Amazon-side changes and pass them on to Shopify. For anything Amazon holds and ships, we leave the count alone on purpose.
That is deliberate rather than unfinished. Amazon owns the stock sitting in its own warehouses, and it knows what is on those shelves better than we do. Writing our number over theirs would mean guessing at receipts, damages and returns that never pass through us, so the honest thing is to let Amazon keep that figure and not pretend otherwise.
One more limit to plan around: Amazon has no way for us to send a tracking number back. If you ship an Amazon order from stock you also sell elsewhere, the tracking stays in QuickSync and in whichever shop the order came from.
Two shops fits the smallest plan
Your catalogue size picks the plan, and your plan price covers two connected shops with every shop after that adding it again. Three shops on Lite is $38 a month.
Lite
$19/mo for two shops1,000 items and up to eight connected integrations, with stock matched on both sides automatically. Enough for Shopify and Amazon on their own, at $19 a month for the two.
Pro
$29/mo for two shops2,500 items and up to eight connected integrations. Listings and orders sync here as well as stock. Most sellers running two shops properly end up here.
Ultra at $69 and Ultra+ at $99 add larger catalogues, price rules and setup help. Every plan starts with a 14-day free trial and no card.
Questions people ask about this pair
How quickly does Amazon update after something sells on Shopify?
A second or two in normal conditions. Shopify tells us the moment the sale happens and we write the new count to Amazon straight away. The reverse is the same when Amazon sells. If either side is briefly unreachable we hold the update and keep trying rather than dropping it.
Can I integrate Shopify with Amazon?
Yes, and there is more than one way. Shopify’s own Marketplace Connect app is free and links the two directly, which is the right answer if Amazon is the only other place you sell. QuickSync is for the case where a third or fourth place also holds the same stock, because then the count needs to live somewhere that belongs to none of them.
Can Amazon fulfill my Shopify orders?
Yes, through Amazon’s Multi-Channel Fulfillment, but that is Amazon’s service rather than ours. QuickSync does not pick, pack or ship anything. We keep the stock figure straight across your shops and pass orders into QuickSync; who puts the parcel together is a separate decision.
Why is my Shopify and Amazon inventory still not matching?
The usual cause is the SKU. Amazon truncates anything over 20 characters, so a longer Shopify SKU arrives shortened and no longer matches the item it came from. The second cause is fulfilment: stock that Amazon holds and ships keeps its own count, so those items are not meant to follow your Shopify figure.
Do I have to re-list my Shopify products on Amazon?
No. We match your existing Shopify and Amazon listings by SKU first, then by title, and hand you a short list of whatever we could not match. You can also copy a listing from one side to the other if you want it in both places; that step always waits for you.
Can I charge a different price on Amazon?
Yes. Set a rule once for Amazon: a percentage, a fixed uplift, or a price you type yourself. We apply it whenever the price changes, and nothing forces Shopify and Amazon to the same number.
Does the tracking number go back to both shops?
Not to Amazon. Amazon has no way for us to send a tracking number back.
Does an Amazon order get recreated on Shopify?
No. The order stays on Amazon. We pull it into your one QuickSync list next to your Shopify orders so you pack from one place, without creating a duplicate Shopify order for it.
What happens if a buyer cancels or I refund them on Shopify or Amazon?
The stock goes back. A cancellation or a refund puts the item back into your count and we send the corrected number to both Shopify and Amazon.
Which plan do I need for Shopify and Amazon?
Lite covers Shopify and Amazon. Lite is $19 a month for two shops and holds 1,000 items, with up to eight connected integrations. You would move up a plan for catalogue size, and your bill goes up by another $19 if you connect a third shop.
Guides for running Shopify and Amazon together
Setup walkthroughs, edge cases and comparisons that go deeper than this page — each one is a sub-question, not another page chasing the same head term.
Selling somewhere else as well?
Each combination has its own page, including the limits that apply to that pair, not a generic Shopify write-up with the logo swapped.
Or read about one shop on its own
Every channel has a page covering exactly what syncs, what does not, and how fast.
Connect Shopify and Amazon and watch one correct the other
Make one test sale and watch the other shop’s count drop. If it doesn’t work the way this page describes, you’ve spent ten minutes and no money.
No credit card required
Setup guides for this pair
Connect each shop with its own walkthrough, then come back to this page for how Shopify and Amazon stay in step.