Where to edit it in Shopify
Open the product, collection, page or blog post in Shopify admin and scroll to Search engine listing. Click Edit to change the page title, meta description and URL handle. For the homepage, go to Online Store, then Preferences.
Length
- About 160 characters is Shopify's recommendation.
- 320 characters is the most the field accepts.
- About 120 characters is a safe target for the key message on mobile.
Google does not use a fixed character limit. It cuts snippets by pixel width and sometimes writes its own from your page text when it thinks that matches the search better.
What makes a good meta description
- Say what the product is, using the main keyword once.
- Give the key benefit or differentiator.
- Add a reason to click: shipping, returns or bundle info, if it is true.
- Write a unique description for each page. Duplicates make Google more likely to ignore them.
Example (138 characters): Keep drinks cold for 24 hours with the Acme 32 oz insulated bottle. Leak proof lid, fits cup holders, free returns within 30 days.
Check the title too with the Shopify SEO title checker.