How to fix a duplicate header in a Shopify CSV

Fix: Remove or rename the duplicate header only after deciding which column is authoritative. Duplicate names make field mapping ambiguous.

BLOCKEDunknown modeDUPLICATE_HEADER

Exact symptom

People may reach this page after seeing or searching for wording such as:

Shopify CSV duplicate header
Duplicate Shopify CSV column name
DUPLICATE_HEADER Shopify CSV

The wording above is a discovery aid. The actual Q-Surface result for the synthetic case is Duplicate header: Title.

Do this now

Identify every repeated header name.
Compare the values in the duplicate columns and decide which one should remain.
Remove or correctly rename the other column, then rerun the file.

Verify before import

Run the exact public synthetic case first, or check your own file locally in the browser. The synthetic result demonstrates only this case and is not a diagnosis of your CSV.

Run the exact synthetic case Check my own CSV

What the deterministic case shows

Verdict: BLOCKED. Primary issue: DUPLICATE_HEADER.

URL handle,Title,Title,Price
dupe,Product,Product 2,10.00

Inspect the evidence receipt · Open the full evidence case

Boundary

Your CSV is processed in your browser. No Shopify login. No store connection. No CSV storage.

Q-Surface cannot decide which duplicate column the author intended to keep.
Q-Surface does not guarantee Shopify import success and is not affiliated with Shopify.