Product identification + inventory planning

Product codes and inventory made easier.

Create and validate barcodes, work with GTIN and GS1 data, make product labels and calculate what to reorder—without turning a simple task into enterprise software.

Free toolsNo accountBrowser-first bulk toolsSource-backed guidance

Find the right tool

Search by task, identifier or calculation. Product data entered in core browser tools is not sent to a QiiChain account because no account is required.

Start with the job

What do you need to do?

QiiChain is organized around the product and inventory workflow, not around a wall of unrelated calculators.

01Create a barcodeGenerate UPC, EAN, Code 128, ITF-14 and 2D symbols.02Check a product codeValidate GTIN, UPC or EAN and identify check-digit errors.03Work with GS1 & 2DBuild Digital Link URIs, parse AIs and prepare richer product data.04Plan inventoryCalculate reorder points, safety stock, stock cover and EOQ.

GS1 + 2D transition

Prepare product data for richer 2D barcodes.

GS1’s industry goal is widespread retail adoption of QR Codes powered by GS1 and other next-generation 2D barcodes by the end of 2027. QiiChain focuses on the underlying work that makes that transition useful: clean GTINs, Application Identifiers, Digital Link syntax, lots, dates, serials and scanner-ready data.

Understand the 2027 goal Build a Digital Link

Current referenceGS1 Digital Link URI syntax 1.6.0GS1 lists version 1.6.0 as the current URI syntax release (April 2025). QiiChain pages show their review date and link to the source used.

Popular utilities

Useful before you need a full system.

GTIN ValidatorValidate GTIN-8, GTIN-12, GTIN-13 or GTIN-14 using the standard modulo-10 check digit and report the normalized GTIN length.GTIN Check DigitCalculate the final check digit for a GTIN key using the GS1 modulo-10 weighting method.GS1 Digital Link BuilderBuild a GS1 Digital Link URI from a GTIN plus optional lot, serial or expiration qualifiers, with validation before output.GS1 AI ParserParse parenthesized GS1 AI data such as (01), (17), (10) and (21) into readable field names, values and validation notes.Reorder Point CalculatorCalculate the inventory level that should trigger replenishment using average daily demand, lead time and safety stock.Safety Stock CalculatorEstimate a practical safety-stock buffer from maximum and average daily demand and supplier lead times.EOQ CalculatorEstimate the economic order quantity that balances ordering cost and annual inventory holding cost under the classic EOQ assumptions.Bulk Inventory PlannerPaste or upload SKU inventory data and calculate stock cover, lead-time demand, reorder point and urgency for many items locally in the browser.

Inventory planning

Use formulas as decisions, not decoration.

Every inventory calculator shows its formula, assumptions and the next question to ask. Reorder point, safety stock and EOQ can be useful, but they cannot make volatile demand, supplier delays or minimum order quantities disappear.

Demand→Lead time→Safety stock→Reorder point→Review

How QiiChain is built

Fast answer first. Standards and assumptions underneath.

1. Do the task

The working tool appears before long supporting content.

2. Explain the result

Results are written in plain language with formulas or validation evidence.

3. Show the limit

A valid barcode number is not the same as retailer acceptance, and a stock formula is not a forecast.

4. Link the source

GS1 rules and important inventory formulas are tied to the documentation used to explain them.