Diajzs Online Barcode & QR Code Generator
Create retail, logistics, and healthcare barcodes in seconds. Our generator supports popular 1D codes like CODE128, EAN‑13, UPC‑A, ITF‑14, and CODE39, plus 2D codes such as QR Code, Data Matrix, and PDF417. Download in PNG or SVG for labels, packaging, and documents.
When to use each code
- CODE128: High‑density general purpose; shipping labels and internal inventory.
- EAN‑13 / UPC‑A: Retail point‑of‑sale product identifiers.
- ITF‑14: Outer cartons and logistics cases.
- CODE39: Industrial and asset tags.
- QR Code: URLs, marketing, payments, and rich data on mobile.
- Data Matrix: Small components, electronics, and healthcare items.
- PDF417: ID cards, boarding passes, and transport documents.
- GS1 variants: Supply‑chain compliant encoding with Application Identifiers (AIs).
How to generate a valid barcode
- Select the Symbology that matches your use case (retail, logistics, ID, etc.).
- Enter the Barcode Data. For GS1, add the correct AI and value (e.g., (01)GTIN).
- Optionally set Display Text shown under the code.
- Click Generate Barcode, then download PNG or SVG.
Best‑practice tips
- Maintain quiet zones: keep clear margins around the code so scanners read reliably.
- Print contrast: dark bars on a light background work best.
- Choose the right size: avoid compressing barcodes on tiny labels; test with your scanners.
- Use GS1 formats when products move through retail or healthcare supply chains.