Variant Preflight — local CSV review

Partial checks, not import approval. This tool cannot inspect your store or guarantee an import is safe. Export a backup and test a small batch in Shopify before importing. Independent tool; no Shopify affiliation.

1. Choose a CSV

Open a UTF-8, comma-separated product CSV or paste it below. Maximum 5 MiB and 20,000 data records. Your original file stays unchanged.

Read a local file

Read on this device. No network requests, accounts, cookies or storage.

What will you use the CSV for? CSV contents

Choose a sample to see how the review works.

2. Review the findings

Errors need review; warnings need context. A report with no findings still has unchecked areas.

—Data records

—Errors

—Warnings

No review yet

Findings use the physical starting line of each CSV record, including quoted multiline fields.

Try the clean and problem samples. No store access is needed.

Reports can include product identifiers. Treat them as business data.

Know the scope

What this pilot checks

CSV quoting and row widths; supported current and legacy headers; selected missing-option risks; duplicate option combinations and SKU warnings; basic price and image URL syntax. Unknown columns are called out as unchecked.

What it cannot check

Existing store data, whether handles match the right product, live image availability, metafields, Markets, inventory locations, category rules, app dependencies and actual Shopify import behavior. It does not fix or upload CSV files. It is not a backup.

Data and compatibility

Everything runs inside this file in your browser. No analytics, remote fonts, API requests or persistent storage. Closing or reloading clears the working session. Exported reports remain wherever you save them. Use desktop Chrome. Edge, other browsers and mobile devices have not been verified for this pilot.