Work offline
Extract the ZIP and open its HTML file in a modern browser. No store permissions or hosted account needed for checking.
A SMALLER, SAFER STEP BEFORE IMPORT
Catch obvious CSV problems before they reach your store.
A focused Shopify product CSV preflight for merchants handling bulk edits. Try a limited checker here without uploading a file; get the offline download for selected deeper checks and exportable findings.
No store login · CSV stays in this browser · Aggregate Cloudflare page analytics · Not affiliated with Shopify
01 / SPOT STRUCTURE RISKS02 / REVIEW LINE-NUMBERED FINDINGS03 / BACK UP & TEST IMPORT
FREE BROWSER DEMO
Try it on a product CSV
Paste a small product CSV, or load the fictional example. The checker runs in your browser and does not send the CSV to our server. For sensitive data, use the offline paid download instead. This demo checks a deliberately limited subset.
Maximum 100 KB / 500 data rows. Paste product data only, never customer or order exports.
Load the example or paste CSV to see findings.
Free: headers, required columns for chosen intent, row width, basic option dependencies. Paid: additional selected checks for values, URLs, repeated SKUs and spreadsheet risks, plus CSV/JSON findings exports and an EN/FI interface. Neither checks every Shopify rule.
THE DOWNLOAD
When you need a report you can keep.
Review selected risks
Malformed quotes and row widths, missing headers, selected price/status values, image URL shape, repeated SKUs and formula-like cells.
Export your findings
Get line-numbered findings as JSON or CSV. Interface controls are in English and Finnish; rule explanations remain in English.
Catalog Preflight v0.1.1
One-time €5.90 digital download through Gumroad. No subscription.
PRACTICAL CSV GUIDE
Before a Shopify product CSV import
Shopify’s product CSV documentation is the format authority. Its current guidance says CSV columns are comma-separated and the first row carries the column headers. For a new product, Title is required; when adding variants, URL handle is also required. Updating products requires both URL handle and Title.
Variant columns need context
When updating variant-related fields such as SKU or weight, Shopify says to include Option1 name and Option1 value. Omitting option data can create a default variant and delete existing variants. Review these dependencies against your actual import; a preflight warning cannot predict every importer outcome.
Use a backup and a small import
Export a backup before bulk edits. Test a small representative import and inspect products and variants afterward. For stores with multiple locations, Shopify points to its separate inventory CSV workflow rather than relying on the sample product CSV’s inventory quantity column. This tool neither edits your CSV nor performs an import.
Need a concrete checklist before changing SKUs? Read the variant-update safety worksheet with a fictional side-by-side example and a small-import procedure.
Source: Shopify Help Center, Using CSV files to import and export products.
COMMON QUESTIONS
What this does—and doesn’t
Does this guarantee Shopify will accept my import?
No. Both versions perform selected preflight checks, not exhaustive validation or an import guarantee. Back up and test a small import.
Does the free demo upload my CSV?
No. Its checking code runs in your browser; this page has no CSV upload endpoint. Avoid pasting sensitive information into any web page. The paid ZIP can run offline after extraction.
What is different in the paid download?
It adds selected value, URL, duplicate-SKU and spreadsheet-safety checks; line-numbered CSV/JSON exports; an English/Finnish interface; and offline use. Rule explanations are English. It does not repair files automatically.
Will this edit my store or CSV?
No. Neither version imports to Shopify or changes your source file. No Shopify credentials are needed.
What CSV format should I use?
Use a UTF-8 comma-separated product CSV based on Shopify’s latest documentation. The checker recognizes selected current and older field names; it does not support every Shopify column or format.