Bulk Barcode Generator
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About This Tool
This tool generates barcodes in bulk following international standards defined by GS1 and ISO. It supports over 25 barcode symbologies across five categories: retail product codes (EAN-13, UPC-A per ISO/IEC 15420), industrial codes (Code 128 per ISO/IEC 15417, Code 39 per ISO/IEC 16388), 2D matrix codes (QR Code per ISO/IEC 18004, Data Matrix per ISO/IEC 16022, PDF417 per ISO/IEC 15438), GS1 supply chain codes, and postal barcodes. Three input methods make it easy to generate any quantity: type values manually (one per line), upload a CSV or TXT file with column selection, or use the built-in sequence generator with customizable prefix, suffix, and zero-padding. All processing runs entirely in your browser. Your product codes, SKU numbers, and business data are never transmitted to any server.
Sources:
GS1 Barcode Standards ·
ISO/IEC 15417 (Code 128)
How to Use
- Select a barcode format from the dropdown menu (Code 128 is selected by default).
- Enter barcode values using Manual entry, CSV upload, or the Sequence generator.
- Optionally customize appearance (scale, colors, text visibility, rotation).
- Click Generate and export as PNG, SVG, ZIP, PDF, or print directly.
How to Use
- Select a barcode format from the dropdown menu (Code 128 is selected by default).
- Enter barcode values using Manual entry, CSV upload, or the Sequence generator.
- Optionally customize appearance (scale, colors, text visibility, rotation).
Methodology
Barcodes are generated using the bwip-js library, which implements the Barcode Writer in Pure PostScript (BWIPP) engine. Each barcode symbology follows its respective ISO or GS1 standard for encoding, check digit calculation, and quiet zone requirements. For retail barcodes (EAN/UPC), the check digit is calculated using the GS1 standard algorithm: alternating weights of 1 and 3 applied to digit positions, with the check digit being the value needed to make the weighted sum a multiple of 10. The tool validates input data against each format's requirements before rendering, including character set restrictions, length constraints, and check digit verification.
Understanding Your Results
After generating barcodes, each one appears in the results grid with its encoded value shown below. You can hover over any barcode to reveal individual PNG and SVG download buttons. The validation indicator above the generate button shows how many values are valid for the selected format and how many have errors (wrong length, invalid characters, or incorrect check digits). Only valid values are included in the generated output. When exporting to PDF, the label layout settings determine how barcodes are arranged on each page. The grid shows columns × rows, and the tool automatically handles pagination when there are more barcodes than fit on one page.
Practical Examples
Example 1: Inventory Labels Select Code 128, switch to Sequence tab. Set Start: 1, End: 500, Step: 1, Prefix: "INV-", Pad: 5. Click Generate — this creates 500 barcodes from INV-00001 to INV-00500. Export as PDF with 3 columns × 8 rows to create print-ready label sheets. Example 2: Retail Product Codes Select EAN-13, enter product codes one per line in the Manual tab: 5901234123457, 4006381333931, 8710398527844. Click Generate, then download as ZIP (SVG) for high-quality graphics suitable for packaging design.
Tips for Best Results
• Use the sequence generator for numbered inventory labels — set a prefix like "SKU-" and zero-pad to 4+ digits for consistent scanning. • For retail products, always verify that your EAN-13 or UPC-A codes have valid check digits. The tool validates these automatically. • Export as SVG for print design workflows — SVG barcodes scale to any size without losing quality, unlike PNG which may pixelate when enlarged. • When printing labels, use the PDF export with grid layout. Set margins to match your label sheet and test with a single page before printing large batches. • Keep the scale at 3 or higher for reliable scanning. Lower scales may produce bars too thin for some scanners to read.
Sources
All calculations are performed locally in your browser. No data is sent to any server.
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Frequently Asked Questions
What barcode formats are supported?
Over 25 formats in five categories: retail (EAN-13, EAN-8, UPC-A, UPC-E, ISBN, ISSN), industrial (Code 128, Code 39, Code 93, Interleaved 2 of 5, ITF-14, Codabar, MSI, Pharmacode), 2D matrix (QR Code, Data Matrix, PDF417, Aztec Code, Micro QR), GS1 (GS1-128, GS1 Data Matrix, DataBar), and postal (POSTNET, USPS Intelligent Mail, Royal Mail, Japan Post).
How many barcodes can I generate at once?
There is no hard limit. The sequence generator supports up to 10,000 barcodes per batch, and manual entry or CSV upload can handle thousands of values. Generation is processed in chunks to keep your browser responsive.
What export formats are available?
Four export options: individual PNG or SVG downloads for each barcode, ZIP archives containing all barcodes as PNG or SVG files, multi-page PDF with configurable label grid layout (choose page size, orientation, rows, columns, and margins), and direct browser printing.
Is my data sent to a server?
No. All barcode generation and export happens entirely in your browser. Your product codes, SKU numbers, and CSV data never leave your device. The barcode rendering library is loaded once from a CDN and then runs locally.
Which barcode format should I use?
For general-purpose use, Code 128 is the most versatile — it supports all ASCII characters with high density. For retail products, use EAN-13 (international) or UPC-A (North America). For shipping cartons, ITF-14 is the standard. For small items needing compact codes, use QR Code or Data Matrix. For pharmaceutical packaging, use Pharmacode. When in doubt, Code 128 is a safe default.
How does the sequence generator work?
Enter a start number, end number, and step size to generate a numeric sequence. Optionally add a prefix (e.g., "SKU-"), suffix (e.g., "-A"), and zero-padding length. For example, start 1, end 100, step 1, prefix "SKU-", pad 4 generates SKU-0001 through SKU-0100.
What is a check digit and do I need to include it?
A check digit is the last digit in barcodes like EAN-13, UPC-A, and ITF-14, calculated from the other digits to detect scanning errors. You can enter values with or without the check digit — the tool validates it if present and the barcode library calculates it automatically if omitted.
Can I customize barcode colors and size?
Yes. Open the Appearance panel to adjust scale (1-10x), bar height, bar color, background color, text visibility, text alignment, and rotation (0°, 90°, 180°, 270°). Changes are reflected in the live preview immediately.