Free tools and straight answers for Shopify chores
Check barcodes, find duplicate SKUs, catch products that have no weight, and fix the store problems that turn up as feed errors, wrong shipping rates and messy inventory. The tools run in your browser. The guides use Shopify's own documentation, and the fixes in them work without installing anything.
Free tools
- Free Shopify store catalog auditEnter a store address and see shippable variants with no weight, duplicate SKUs and products without images, from the public product feed.
- Shopify product export checkerCheck a Shopify product export for missing weights, barcodes, SKUs, images, alt text and categories, bad GTINs and duplicates.
- GTIN, UPC, EAN and ISBN check digit validatorPaste up to 20,000 barcodes and see which fail the check digit, which lost a leading zero, and which Google will reject.
- Duplicate SKU and barcode finderDrop in a Shopify product export (or any list) and see every SKU and barcode used by more than one variant.
- Shipping weight helperConvert g, kg, oz and lb (with the grams value Shopify's CSV wants), add packaging, and work out dimensional weight.
Guides
- Google Merchant Center says my Shopify product has an invalid GTIN. How do I fix it?What each GTIN error in Merchant Center means, where Shopify sends the GTIN from, and how to correct it.
- How do I find duplicate SKUs and barcodes in Shopify?Shopify lets two variants share a SKU or barcode. How to list every duplicate from an export and fix them.
- My products don't have a GTIN or barcode. What should I do on Shopify?Handmade, custom or own-brand products without a GTIN: when to tell Google there is none, and when to get one from GS1.
- Excel removed the leading zero from my barcodes in a Shopify CSV. How do I fix it?Why spreadsheets break UPCs (11 digits, 3.6E+11) and how to open, repair and re-import a Shopify CSV safely.
- Why are my Shopify shipping rates wrong? (Products missing weight)A product with no weight counts as weightless, so carts land in lower rate tiers. How to find and fix missing weights.
- How do I bulk edit product weights in Shopify?Set weights for hundreds of variants with a product CSV (always in grams), plus the bulk editor option and how to verify.
- How do Shopify packed dimensions and automatic box selection work?Shopify can pick the smallest saved box that fits a multi-item order, but only when products have packed dimensions.
- Stocky is shut down: how do I print barcode labels from Shopify purchase orders?Stocky stopped working on August 31, 2026. Here are the ways to label incoming stock now that purchase orders live in the Shopify admin.
- How do I print Shopify barcode labels on Avery 5160 or 5167 sheets?Sheet labels on an ordinary printer: which layouts work, which barcode type to use, and how to keep them aligned.
- How do I see inventory adjustment history in Shopify?Where Shopify shows each stock change, what the columns mean, the 180-day limit, and the report for longer ranges.
- Why did my Shopify inventory change when nobody touched it?A step-by-step way to trace an unexpected stock change to the order, app, import or person that caused it.
- How do I email a weekly orders CSV from Shopify automatically?What Shopify can do on its own (manual export, Flow emails) and what it can't (a scheduled file attachment).
- Can Shopify Flow email a CSV file attachment?Flow's email action has no attachment field. Here's how to put CSV-style rows in the email body, and where that runs out.
- How do I export Shopify orders for a date range?The exact export steps, why the file arrives by email, and how to open it in Excel without mangling numbers.
Who makes this
We're a small team building focused Shopify apps: Catalog QA, Packfill, Stocklog, Ordermail and Polabel. Each guide closes with the app that handles that chore, if there is one, and spells out what the app doesn't do.