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Shopify Inventory CSV Stock Update Builder

Merge supplier stock counts into a Shopify inventory CSV and download the update file plus exceptions.

Use this tool

Prepare the input and run the tool

Paste the Shopify inventory export and a supplier stock CSV with SKU and quantity columns. Result: Download the inventory update CSV and an exception CSV.

All tools

Paste a Shopify inventory export and a supplier stock CSV, choose the matching columns, then download the update CSV and exception report.

Recommended laneUp to 500MB combined inputs on modern desktop browsers
Local mergeNo upload; Shopify and supplier files stream in a worker
Large outputsReady CSV and exception report are split into downloadable parts

Best for Chrome or Edge on a desktop browser. Keep this tab open while the worker runs. If the combined files are above 500MB or the browser warns about memory, use Split CSV first and run matching parts.

Drop Shopify inventory CSV here

Use Shopify inventory exports with SKU and quantity columns.

Drop supplier stock CSV here

Use supplier, POS, WMS, or ERP stock files with SKU and quantity columns.

Ready.

Inventory update report

Generate the update CSV and review exceptions

Waiting for run
Rows checked--
Issues found--
Blockers--
Next actionMap columns
Run to generate summary and outputs.

No exceptions yet.

RowSeverityTypeSKUFieldValueReasonSuggested action
Data handling: Files and pasted data are processed in this browser session.

Readiness details

What to check before using the result

Sample input

Shopify inventory export plus a supplier stock CSV with SKU and quantity columns.

Output preview

Inventory update CSV rows plus an exception report for unmatched, duplicate, blank, or invalid SKU rows.

Expected checks

  • SKU match coverage
  • Duplicate or blank SKUs
  • Invalid quantity values
  • Rows excluded from the update file

Artifacts you can produce

  • Shopify inventory update CSV
  • Exception CSV for rows that need review

Limits to review

  • Does not connect to Shopify or submit inventory changes.
  • Column mapping still needs human review when supplier exports use unusual names.

Practical notes

  • Keep the original Shopify export unchanged.
  • Review the exception report before importing the generated update CSV.

References and workflow

Open related workflow

Tool guide

How to use Shopify Inventory CSV Stock Update Builder

Use this before updating Shopify inventory from a supplier or POS export. It creates the update file and a separate exception report for rows that need review.

What this tool does

Merge supplier stock counts into a Shopify inventory CSV and download the update file plus exceptions.

Input
Paste the Shopify inventory export and a supplier stock CSV with SKU and quantity columns
Output
Download the inventory update CSV and an exception CSV

Tool advantages

  • Runs in this page; the file or pasted data is not sent to a new app.
  • Keeps the preview, report, and download in the same screen.
  • Gives you a report you can use as a cleanup list.

Step-by-step usage guide

  1. 1Paste both CSV files.
  2. 2Confirm SKU and quantity columns.
  3. 3Download the update file and fix rows listed in the exception report.

Common errors and fixes

Supplier SKUs do not match Shopify SKUs

Supplier exports often use alternate casing, spaces, pack-size suffixes, or vendor SKU aliases.

Normalize SKU columns and add a mapping sheet before building the Shopify inventory update file.

Inventory quantities are rejected

Blank, negative, decimal, or text quantities can create unsafe stock updates.

Convert stock cells to plain whole numbers and put uncertain rows into the exception report instead of the upload file.

Duplicate SKU rows create conflicting updates

A SKU may appear once per warehouse, vendor, or size pack in the supplier file.

Aggregate or choose the correct stock source before downloading the final Shopify update CSV.

When to use Shopify Inventory CSV Stock Update Builder

  • You are checking files before an upload, import, share, or delivery.
  • You want to confirm the result before sending it to another system.
  • You need a copied result, downloaded file, or report that can be reviewed outside the page.

FAQ

What files do I need?

Paste your Shopify inventory export and your supplier/POS stock CSV (at least SKU + quantity).

What files can I download?

Download an updated inventory CSV and an exception report for rows that need cleanup.

What happens to unmatched SKUs?

Unmatched rows are listed in the exception report so they can be fixed before the next pass.