Why did my Shopify conversion rate suddenly drop?

Are your sales actually down?

Start there, because conversion rate isn’t your north star. Sales are. I’ve had founders come to me worried about a big conversion rate drop when their revenue was fine.

Revenue is basically sessions times conversion rate times average order value. Break it into those three parts and compare each one against the same weekday a week earlier. A scary revenue number is usually a few smaller drops stacking on top of each other, and each one points somewhere different:

Traffic down points to your ads or your tracking.
Conversion rate down points to the site or the checkout.
AOV down points to your offers or your product mix.

I also watch returning customer rate and the share of revenue coming from email. Together they tell you whether the business is healthy underneath the paid traffic.

Did your traffic go up?

If it did, a lower conversion rate is normal. Conversion rate will always go down when traffic goes up, until it stabilises. New audiences browse before they buy.

My rule of thumb is simple. If traffic’s up by roughly the same percentage that conversion rate is down, there’s nothing to worry about. You’re reaching more people and nothing is broken.

You only go hunting when the conversion drop outpaces the traffic increase. Before you do, clean the number up. Look at conversion rate for real human visitors in your main country, because bot traffic and overseas visitors can drag the headline figure down on their own.

I went through exactly this live with a founder who was worried after a change to their product pages. Sales first, then returning customer rate, then traffic, then human-only conversion in their home market. Nothing was drastically broken.

What did you change recently?

Look there next. A new app, a theme edit, a change to how your images or product videos load. Anything that went live around the time of the drop is a suspect, so list every change from the last few weeks and check each one.

How do you find the part of your traffic that broke?

If you haven’t changed anything and your ad metrics look stable, open the conversion report in Shopify analytics. Whenever there’s a big fluctuation, this is what I do:

Set the date range to the day or week of the drop and compare it with the period before.
Remove all the dimensions from the report.
Add session device type back in and compare.
Swap to browser and compare again.
Then do the same with operating system.

You’re looking for a large chunk of traffic that has dropped dramatically, something like an 80% fall in one segment while everything else holds steady.

When we did this for a store whose conversion rate and sales had roughly halved over a few days, with no theme changes, the drops were sitting in the Facebook in-app browser and on Android. The usual causes are a buggy operating system update, the in-app browser misbehaving, or Meta’s algorithm scaling your ads into a poor-quality segment. Once you know which segment fell over, you know which of those to chase.

What if traffic is up and sales are still falling?

Then assume something on the website is broken, and go and find it. Don’t blame the market first. If you sell subscriptions and those are holding steady while one-off online store sales drop, that’s a strong sign the problem is in the store.

Test the buying journey yourself, from add to cart through to checkout, and time it. On one store we looked at, it was taking eight seconds to get from the cart to the checkout.

Export your order history and have an AI tool analyse it by customer cohort. You’re looking for shifts in how often people order and how quickly they spend. If one group’s spend velocity has dropped, that tells you where to dig.

Then ask your customers. Send a plain-text email from a real person in the business, with a subject line like “Issues?”, saying you’ve been working on the site, found a few problems and want to know if they’ve run into any. Plain text from a named founder gets replies. Designed newsletters don’t. You’ll hear about the browser, device and checkout bugs you can’t reproduce yourself, which is exactly what you need when sales drop and you can’t see why.

Nathan Frater

Managing director of Backbone, an e-commerce marketing agency in Auckland. Most weeks I'm on calls with Shopify brands working out what to fix next, and I write up the patterns here.