Barcode Generator
Generate CODE128, EAN-13, UPC, and other barcodes online.
Linear barcodes still power checkout counters, warehouse scanners, and shipping labels worldwide. Utilitoo's Barcode Generator turns your product numbers, SKUs, and carton codes into printable bar images without desktop label software or cloud uploads.
E-commerce sellers create EAN-13 or UPC-A codes for packaging mockups before formal registration. Warehouse teams print CODE128 labels for internal bins and pick lists. Makers and craft sellers sticker inventory with scannable IDs tied to spreadsheet SKUs. Event staff generate ITF-14 carton codes for bulk shipment tests.
Select a format, enter the value, adjust bar width and height for your label printer, toggle human-readable text beneath the bars, and download a PNG. CODE128 accepts general alphanumeric strings - ideal for internal references. EAN-13 and UPC-A expect digit lengths used in retail; the library calculates check digits when you provide the correct number of digits.
All rendering happens locally in your browser on Utilitoo. Your product codes and inventory data are not sent to our servers. For best scan results, print at 100% scale on white stock with adequate quiet zone margins around the bars.
Use QR Code Generator when you need a square code for URLs or WiFi instead of a linear retail symbology. Pair with Slug Generator or UUID Generator when designing human-readable identifiers before encoding. Free, fast, and privacy-first for small businesses, developers, and logistics teams who need barcodes on demand.
Barcode Generator complements QR Code Generator on Utilitoo: linear barcodes suit retail POS and handheld laser scanners, while QR codes suit phone cameras and rich payloads like URLs. This tool helps you visualize and print symbols from numbers you already own or from internal test values.
Common use cases
- Creating CODE128 labels for warehouse bins, pick lists, and internal SKU tracking.
- Rendering EAN-13 or UPC-A symbols on product mockups before final packaging design.
- Generating test barcodes for scanner app development and QA checklists.
- Printing ITF-14 carton codes for shipping workflow trials.
- Producing inventory stickers for craft fairs, pop-up shops, and small retail tables.
Tips & common mistakes
Match the format to your scanner and use case: retail checkout expects EAN-13 or UPC-A with valid GTINs you registered; internal logistics often uses CODE128. Print at 100% scale with quiet margins on white stock. If scans fail, verify digit count, increase bar height, and avoid bar width below 1.5 on inkjet prints. Utilitoo renders barcodes in your browser - product numbers are not uploaded.
Common errors
- Invalid digit length for EAN-13 or UPC - retail formats require specific counts; check your source GTIN.
- Scanner misreads bars - low DPI print, colored backgrounds, or truncated quiet zones cause failures.
- CODE39 rejected - only uppercase letters and limited symbols are valid in CODE39 payloads.
General-purpose alphanumeric codes for logistics and internal SKUs.
How to use
- Select a barcode format (CODE128, EAN-13, UPC, etc.).
- Enter the value to encode.
- Adjust bar width, height, and colors.
- Download the barcode as a PNG image.
Frequently Asked Questions
What is the difference between CODE128 and EAN-13?▼
CODE128 encodes general alphanumeric text for internal logistics. EAN-13 is the 13-digit standard used on retail products worldwide.
How do I create a UPC barcode?▼
Select UPC-A, enter 11 or 12 digits, and download the PNG. Utilitoo renders a scannable UPC symbol for labels and mockups.
Are my product codes uploaded?▼
No. Barcode generation runs locally in your browser on Utilitoo. Your SKUs and GTINs stay on your device.
Why will my barcode not scan?▼
Check digit count for your format, print size, contrast, and quiet margins. Low resolution or extreme bar width settings cause scan failures.
Can I use generated barcodes on products I sell?▼
Retail EAN/UPC numbers must come from your GS1 registration. Utilitoo helps you render barcodes from numbers you already own or for internal testing.
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