Free SKU Generator

Generate SKU codes for your products in seconds — then see how else OmniOrders can help your brand operations.

No signup required. Generate up to 30 SKUs instantly.

How to use this tool
  1. Enter a Product Base — a short code for your product type (e.g., TSHIRT, MUG, HOODIE).
  2. Click Add Attribute to create a variant category (e.g., Color, Size, Material).
  3. Name your attribute, then type each value and press Enter to add it (e.g., BLU, RED, GRN).
  4. Repeat for each attribute. You can add up to 3 attributes.
  5. Click Generate SKUs — the tool builds every combination automatically.
  6. Use Copy All or Export CSV to grab your SKU list.
Uppercase, no spaces or special characters, max 12 characters

Need auto-generation across all your sales channels?

OmniOrders generates SKUs from unlimited attributes and syncs them in real-time across Shopify, Amazon, Walmart, and more.

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Frequently Asked Questions

What is a SKU?

A SKU (Stock Keeping Unit) is a unique alphanumeric code that a business assigns to each distinct product or variant in its inventory. SKUs are used to track stock levels, organize catalogs, and streamline order fulfillment across sales channels.

For example, a blue medium t-shirt might use the SKU TSHIRT-BLU-M, where TSHIRT identifies the product type, BLU the color, and M the size. This structure makes it easy to identify products at a glance and keeps your inventory organized as you scale.

How do you create effective SKUs?

An effective SKU starts with a product category prefix (e.g., TSHIRT), followed by attributes like color and size separated by dashes. Keep SKUs between 8 and 16 characters, use uppercase letters and numbers only, and avoid spaces or special characters.

A few best practices to follow:

  • Be consistent — use the same attribute order across all products (e.g., always Category-Color-Size)
  • Keep it readable — someone on your warehouse floor should be able to decode a SKU without a lookup table
  • Avoid ambiguity — don't use "0" and "O" or "1" and "l" in the same system
  • Plan for growth — leave room in your naming convention for new categories and attributes

Example: HOODIE-RED-XL tells you the product (hoodie), color (red), and size (XL) instantly.

What is the difference between SKU, UPC, and ASIN?

These three identifiers serve different purposes in e-commerce:

  • SKU — An internal code you create to track your own inventory. You define the format and structure. No two businesses use the same system.
  • UPC (Universal Product Code) — A 12-digit barcode issued by GS1 for retail scanning. UPCs are universal — the same barcode works at any retailer worldwide.
  • ASIN (Amazon Standard Identification Number) — A 10-character identifier assigned by Amazon to every product in their catalog. You don't control ASINs — Amazon assigns them.

You control your SKUs. UPCs and ASINs are assigned by external systems. Most e-commerce businesses need all three — SKUs for internal tracking, UPCs for retail, and ASINs for Amazon.

How many characters should a SKU be?

Most SKUs are between 8 and 16 characters long. Shorter SKUs are easier to scan and less prone to data-entry errors, while longer ones can encode more product detail.

Most e-commerce platforms support SKUs up to 40 characters, but keeping them concise is a widely recommended best practice. If your warehouse team hand-types SKUs during picking or receiving, every extra character increases the chance of mistakes.

Do SKUs need to be unique?

Yes, every SKU should be unique within your inventory. Duplicate SKUs cause stock-count errors, picking mistakes, and sync failures across sales channels.

Unlike UPCs, SKU formats are not standardized — each business defines its own system, so uniqueness is your responsibility to enforce. A common source of duplicates is when multiple team members create SKUs independently. Audit your SKU list quarterly to catch and resolve conflicts before they cause fulfillment issues.