What exactly is a SKU and how is it different from a barcode?

A SKU (stock-keeping unit) is YOUR internal code for a sellable variant, you design its format. A barcode (UPC/EAN) is a globally registered number printed for scanners. A blue medium t-shirt might carry the SKU TS-BLU-M and the barcode 0123456789012. The SKU is human-readable so a picker can read TS-BLU-M off a pick list; the barcode is machine-readable for the till. You generally need both: the SKU to organize, the barcode to scan.

How should I design a SKU structure?

Order segments from broad to specific so codes sort sensibly: category, then brand, then color, then size, then a sequence. Keep each segment a fixed short length so columns line up, for example 2-3 letters per attribute. TS-BLK-M-001 reads as t-shirt, black, medium, unit 001. Avoid encoding price or supplier into the SKU, those change; encode only attributes that are intrinsic to the variant and stable over its life.

How do I batch a color and size grid?

Switch to batch mode, set a fixed prefix (say TS for t-shirt), then list colors like Black, White, Red and sizes like S, M, L, XL. The tool builds the cartesian product, 3 colors x 4 sizes = 12 SKUs, and appends an incrementing number. You get TS-BLK-S-001 through TS-RED-XL-012 in one pass, then copy them as a list or CSV straight into your inventory sheet.

Why pad the sequence number with zeros (001 not 1)?

Zero-padding keeps SKUs the same width and sorts them correctly. Without padding, a plain text sort orders 1, 10, 11, 2, 3 because it compares character by character. With 001, 002, ... 010, 011 the codes sort in true numeric order in any spreadsheet or label printer. Pick a width that covers your largest expected count: 3 digits handles up to 999 variants, 4 digits up to 9999.

What makes a good SKU?

Short, unique and readable. Short so it fits on a label and a pick list; unique so two variants never collide (the auto sequence guarantees this); readable so a human can decode TS-BLK-M at a glance without a lookup. Use only letters, digits and one separator. A SKU you can read aloud over the phone to a warehouse without spelling out symbols is doing its job.

Why must I avoid spaces and special characters in a SKU?

Spaces, slashes, hashes and quotes break the systems a SKU flows through. A space splits the code in a CSV import; a slash confuses a URL or file path; a # truncates a link. Stick to A-Z, 0-9 and a single dash or no separator. This tool strips anything else automatically, so typing Size/XL still yields a clean SIZEXL token rather than a code your point-of-sale silently mangles.

Launch a new apparel line with consistent variant codes

You are putting 8 colors and 6 sizes of one t-shirt onto Shopify. Typing 48 SKUs by hand invites typos and collisions. Set the prefix to TS, list the colors and sizes, and the tool emits all 48 codes from TS-BLK-XS-001 to TS-WHT-XXL-048 with the sequence already padded. Paste the CSV into your product import and every variant has a unique, sortable, human-readable code from day one.

Standardize SKUs across a messy legacy catalog

Inherited a spreadsheet where SKUs are half free-text, half blank. Decide a structure once, category then color then size then number, and regenerate each product family through the tool. Because the format is now deterministic, two people entering the same variant land on the same SKU, and your stock counts stop splitting across near-duplicate codes.

Print barcode labels that map to readable SKUs

Your label printer needs a SKU per row to encode under each barcode. Generate the batch here, copy as CSV, and feed it into the label template. The picker reads TS-BLK-M off the shelf label while the scanner reads the barcode above it, the two stay in lockstep because both came from the same generated list.

Hand a manufacturer a clean variant matrix

A factory is producing 4 finishes x 5 dimensions of a shelf bracket and wants a code per combination on the packing list. Build the prefix from the product family, list finishes and dimensions, and send them the 20-row CSV. Every carton gets a SKU that your receiving team can scan back against the purchase order without re-keying.

SKU Code Generator, Structured Product and Inventory SKUs

Build structured SKU codes from attribute segments, then batch the whole color x size grid with auto-numbering, browser-only

Runs locally
Category Generator
Best for Starting from a blank page without committing to the first result.

Separator

Attribute segments

Value

Chars

Value

Chars

Value

Chars

Value

Chars

SKU

TS-BLA-M-1

A good SKU is short, unique and human-readable. Keep it to letters, digits and one separator; never embed spaces, slashes or special characters that break spreadsheets and URLs.

What this tool does

Free SKU code generator for ecommerce and inventory. A SKU (stock-keeping unit) is the internal code you assign to each sellable variant so your warehouse, your spreadsheet and your storefront all point at the same shelf. This tool builds the code the structured way: define a few attribute segments (category, brand, color, size, a running number), decide how many characters to keep from each and whether to uppercase, pick a separator, and it assembles a clean code like TS-BLK-M-001. Switch to batch mode to generate the entire catalog at once: list your colors and sizes, the tool walks every color x size combination, appends a zero-padded sequence, and hands you one SKU per variant. Copy the result as a newline list or as CSV ready to paste into Shopify, a barcode label run or your stock sheet. Everything runs in your browser; nothing about your product line is uploaded. 100% client-side, with a shareable URL that reproduces your exact SKU scheme.

Tool details

Input: Files + Text + Numbers; The page exposes text boxes, numeric controls, file pickers, or structured inputs depending on the tool.
Output: Live result + Copy; The result area focuses on usable output, with copy, download, or preview actions when supported.
Privacy: Browser-side processing; The main tool logic does not call an external API, so inputs normally stay in the current tab.
Save / share: Shareable URL state; Key settings are encoded in the URL so another person can reopen the same setup.
Performance budget: Initial JS <= 9 KB; No WASM budget is declared, keeping the tool quick to open on mobile.
Best fit: Generator · Operations; Category and role tags drive related tools, internal links, and quick fit checks.

How to use

1. Input

Paste or drop your content into the tool panel.
2. Process

Click the button. All processing is local in your browser.
3. Copy / Download

Copy the result or download to disk in one click.

How SKU Code Generator fits into your work

Use it to get a strong first draft, starter asset, or structured output that you can edit before publishing.

Generation jobs

Starting from a blank page without committing to the first result.
Creating repeatable drafts, names, templates, or placeholder assets.
Exploring options before choosing the one that fits the job.

Generation checks

Review generated output before it reaches a customer, page, or document.
Change defaults when you need a specific brand voice, format, or audience.
Keep only the parts that match the real task.

Good next steps

These links move the current task into a more complete workflow.

Real-world use cases

Launch a new apparel line with consistent variant codes
You are putting 8 colors and 6 sizes of one t-shirt onto Shopify. Typing 48 SKUs by hand invites typos and collisions. Set the prefix to TS, list the colors and sizes, and the tool emits all 48 codes from TS-BLK-XS-001 to TS-WHT-XXL-048 with the sequence already padded. Paste the CSV into your product import and every variant has a unique, sortable, human-readable code from day one.
Standardize SKUs across a messy legacy catalog
Inherited a spreadsheet where SKUs are half free-text, half blank. Decide a structure once, category then color then size then number, and regenerate each product family through the tool. Because the format is now deterministic, two people entering the same variant land on the same SKU, and your stock counts stop splitting across near-duplicate codes.
Print barcode labels that map to readable SKUs
Your label printer needs a SKU per row to encode under each barcode. Generate the batch here, copy as CSV, and feed it into the label template. The picker reads TS-BLK-M off the shelf label while the scanner reads the barcode above it, the two stay in lockstep because both came from the same generated list.
Hand a manufacturer a clean variant matrix
A factory is producing 4 finishes x 5 dimensions of a shelf bracket and wants a code per combination on the packing list. Build the prefix from the product family, list finishes and dimensions, and send them the 20-row CSV. Every carton gets a SKU that your receiving team can scan back against the purchase order without re-keying.

Common pitfalls

Encoding volatile data like price or supplier into the SKU. Those change, and when they do you either keep a now-wrong code or reprint every label. Encode only intrinsic, stable attributes (color, size, model), nothing that can be repriced or resourced next quarter.
Skipping zero-padding on the sequence. SKUs like ITEM-1 and ITEM-10 sort as 1, 10, 2 in a plain spreadsheet sort, scrambling your list. Pad to a fixed width (001, 002) so codes stay equal length and sort in true numeric order.
Letting spaces or slashes into the code. A space breaks a CSV import into two columns; a slash corrupts a URL or file path. Keep SKUs to letters, digits and one separator, this tool strips the rest, but a code pasted from elsewhere can still smuggle in a stray character.

Privacy

Every step runs as plain JavaScript in your browser tab: the segment abbreviation, the cartesian expansion, the sequence padding and the copy. No product names, color list or generated SKU is ever sent to a server, and nothing about your catalog is logged. The one caveat: the shareable URL encodes your single-mode segment scheme in the query string, so a share link pasted into chat records that scheme in the recipient server access log. Batch value lists are deliberately kept out of the URL. For a confidential product matrix, use the copy button and paste the text rather than sharing the link.

FAQ

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SKU Code Generator, Structured Product and Inventory SKUs

What this tool does

Tool details

How to use

1. Input

2. Process

3. Copy / Download

How SKU Code Generator fits into your work

Generation jobs

Generation checks

Good next steps

Real-world use cases

Launch a new apparel line with consistent variant codes

Standardize SKUs across a messy legacy catalog

Print barcode labels that map to readable SKUs

Hand a manufacturer a clean variant matrix

Common pitfalls

Privacy

FAQ

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