Technical Specifications
- Input Formats
- Pasted single column, CSV (IETF RFC 4180), Excel TSV, or auto-incrementing sequential series
- Batch Capacity
- Up to 200 barcodes per batch (pre-validation alerts if line count exceeds 200)
- Supported Symbologies
- All 10 formats: Code 128, UPC-A, EAN-13, Code 39, ITF-14, QR Code, Data Matrix, Aztec, PDF417
- Export Packaging
- Consolidated ZIP of individual SVGs/PNGs (001_SKU.svg) or 30-up Avery PDF sheets (5160, 5163, L7160)
- Error Handling
- Pre-render syntax & check digit validation highlighting exact row numbers before generation
- Data Privacy
- 100% in-browser WebAssembly/JS execution; proprietary SKU lists and serial numbers are never uploaded
Standard Industry Use Cases
- Warehouse cycle counting and annual physical inventory audit asset labeling
- Batch SKU barcode generation from Shopify, WooCommerce, or Amazon Seller inventory CSV exports
- Sequential asset tagging and hardware serial numbering (e.g. SN-0001 to SN-0100) on Avery label sheets
- Trade show attendee credential badges and event ticketing QR code batch runs
- Manufacturing work-in-progress traveler routing tags and laboratory specimen tube labeling
Key Benefits of Bulk Excel / CSV
Checked Before Anything Is Made
Every value is checked first (format and check digit). If any line is wrong, you see its line number and nothing is made until it is fixed.
Single-Click Consolidated ZIP Export
Downloads every code as a PNG or SVG in one ZIP, each file numbered and named after its value (e.g. 001_SN-0001.png), or as an Avery PDF with one code per label.
Your Data Stays in Your Browser
Your confidential inventory SKUs, customer lists, and pricing spreadsheets never leave your device.
What Code Do I Need for My Product? (Customer Decision Guide)
Choosing the right barcode format depends on where your product is sold, the packaging substrate, and scanner infrastructure:
How do I format my spreadsheet before pasting?
Put one value per row in a single column, with no formulas in the cells. Blank lines are skipped. If you paste CSV text, only the first column is used.
Can I batch generate sequential numbers without an Excel file?
Yes. Use the Sequenced Numbers tab: set a prefix (e.g. SKU-), a start number (e.g. 1001), how many (up to 100) and the number of digits, and the tool makes the sequence.
Batch Inventory Compliance & Data Protection
- UniversalCodeMaker does not store, log, or cache batch data on any server. Be sure to download your generated ZIP file or PDF before closing the browser window.
- When generating retail EAN-13 or UPC-A batches, ensure all numbers correspond to legitimate GS1 Company Prefixes registered to your organization.
- Always perform a sample test scan of at least 3 random barcodes from your batch before committing to large print runs.
Frequently Asked Questions
How do I generate barcodes from an Excel or Google Sheets spreadsheet column?
Prepare your spreadsheet with one barcode payload or SKU per row in a single column without formulas or header text. Select and copy the column cells (Ctrl+C / Cmd+C). In UniversalCodeMaker, open Batch Mode, select the Paste List / CSV tab, and paste directly into the input area. The engine automatically trims whitespace and parses tab-separated values (taking column 1 if multiple columns are pasted), supporting up to 200 values per batch.
What happens if one barcode value in my 200-row batch contains a formatting error or invalid check digit?
UniversalCodeMaker executes pre-flight validation on every single row before rendering begins. If any item contains illegal characters (such as letters in a UPC-A/EAN-13 numeric string) or an incorrect check digit, generation pauses and displays the exact line number along with the specific error. Nothing is exported until the invalid entry is corrected, guaranteeing zero spoiled labels or wasted sheet paper.
Can I generate sequential serial numbers without uploading a spreadsheet file?
Yes. Under the Sequenced Numbers tab, you can configure an automated series without preparing an external file. Define an alphanumeric prefix (e.g., "SN-" or "LOT2026-"), set a starting integer (e.g., 1001), specify total count (up to 100 per sequence run), and set zero-padding digit width. The studio instantly populates the sequence and generates sequential barcodes in numerical order.
Can I print bulk barcodes directly onto Avery label sheets instead of downloading loose image files?
Yes. In Batch Mode, set Export Format to "Avery PDF Sheet" and select your sheet layout—such as Avery 5160 (30 labels per sheet, 1" × 2-5/8"), Avery 5163 (10 shipping labels per sheet, 2" × 4"), or Avery L7160 (A4 European standard). Each label prints a different code from your list in sequential order, with an optional toggle to include human-readable text beneath the bars.
How are individual barcode files named inside the downloaded ZIP archive?
When choosing ZIP export (vector SVG or high-resolution PNG), each file is systematically named using its zero-padded list index followed by the encoded value (e.g., 001_SKU-A101.svg, 002_SKU-A102.svg). This consistent naming convention preserves your original spreadsheet row sequence and makes importing into packaging layout software or asset databases effortless.
Is my proprietary inventory, supplier SKU, or pricing data stored on UniversalCodeMaker servers?
No. UniversalCodeMaker operates completely client-side inside your local web browser using WebAssembly and pure JavaScript. Your pasted product lists, confidential customer numbers, cost data, and internal serial sequences never traverse the internet and are never logged, cached, or stored on any server. You can even run the batch generator completely offline once loaded.