You just received 40 new SKUs in your warehouse or retail shop and need to label them today so your POS laser scanner can ring them up. Dedicated barcode software wants $180 for a desktop license or forces you to set up complex printer drivers on a single PC.
DataKorex Radical Transparency: At DataKorex, our software engineering team builds every utility with 100% client-side privacy. Generating exact industrial barcodes (CODE-128, EAN-13, UPC, and CODE-39) runs 100% inside your browser RAM for $0 USD, complete with direct US Letter PDF sheet layout for instant printing.
How to use Barcode Generator step by step
- 1. Select barcode format (Code-128, EAN-13, CODE39): Code-128 supports letters and numbers for SKUs; EAN-13 is the 12/13-digit retail standard.
- 2. Type your code or paste a batch list: Enter a single product code with an optional label/price, or paste multiple lines for batch creation.
- 3. Download PNG or Print A4 Label Sheet: Save high-contrast PNGs or print a complete sheet of scannable product labels.
The Step Count: Traditional Friction vs. KorexTools
Generating barcode labels one by one (6 slow steps)
- Type a single SKU into an old single-barcode webpage.
- Right-click and save the image manually.
- Repeat 40 times for every new item in your inventory.
- Open Word or Excel and spend 30 minutes aligning 40 images into columns for sticker paper.
With Free Barcode Generator Online on KorexTools (3 batch steps)
- Pick your symbology (e.g., CODE-128 for custom SKUs or EAN-13 for retail) and paste your list of codes (one per line).
- Preview all generated barcode labels live on screen.
- Click "Download Letter-Size PDF" to print the full sheet or grab the ZIP of individual PNGs.
Quick guide to choosing the right barcode format for your business
Whether you run a retail shop, warehouse, pharmacy, or e-commerce fulfillment center, labeling products for USB laser or camera scanners should not require expensive desktop software. Our generator renders precision barcode bars that every commercial scanner reads instantaneously.
We also include a built-in A4 printable label grid so you can print dozens of scannable stickers on any standard office printer.
Supported symbologies and when to use them
- CODE-128 (Best for SKUs & Inventory): supports both letters and numbers (e.g., SKU-1049-B) with high density.
- EAN-13: international retail point-of-sale standard (automatically calculates the 13th check digit from 12 digits).
- CODE-39: classic industrial symbology widely used in automotive and asset tracking.
The hidden variable almost nobody checks: The mandatory lateral Quiet Zone for laser scanners
A classic mistake when printing barcode labels is cropping right up against the first and last black bar. Handheld laser scanners and checkout beds require a blank white margin on both the left and right sides (called the Quiet Zone, at least 10x the width of the narrowest bar) to calibrate where the barcode begins and ends. KorexTools automatically builds the exact Quiet Zone margin into every label.
Barcode Symbology Comparison
| Symbology | Supported Characters | Primary Use Case |
|---|---|---|
| CODE-128 | Alphanumeric (Letters & Numbers) | Warehouse SKUs, shipping labels, internal inventory |
| EAN-13 | 12 or 13 Numeric Digits | Retail products and point-of-sale scanning |
| CODE-39 | Uppercase Letters & Numbers | Industrial asset tags and ID badges |
What Free Barcode Generator Online does NOT solve (Radical Honesty)
- It does not register official GTIN company prefixes with GS1: if you sell in major retail chains, obtain your official GS1 number list first, then paste those numbers here to generate the printable graphics.
- If you select strict EAN-13 mode and type letters (like `ITEM-01`), EAN-13 will reject it because the spec only allows 12 or 13 numeric digits (use CODE-128 for letters and numbers).
- It outputs standard Letter PDF sheets and PNGs rather than proprietary raw ZPL serial commands.
Privacy Risks & Common Expensive Mistakes to Avoid
For internal warehouse tracking, asset tags, repair shops, and local store POS systems, you can use CODE-128 with your own custom SKU strings (e.g., `SHIRT-BLUE-LG`) for $0 without paying external registration fees.
- Saving barcodes as low-quality JPEG files: JPEG compression creates blurry gray artifacts between black and white bars that cause laser scan failures; always use our crisp PDF or PNG output.
- Printing barcode sheets in "Toner Save / Draft Mode": faded gray bars reduce scanner read distance.
Frequently Asked Questions
Do barcodes created here work with standard USB laser barcode scanners?
Yes, every standard handheld USB or wireless laser/CCD scanner reads our Code-128, EAN-13, and Code-39 barcodes right off paper or screen.
Why does EAN-13 reject letters?
The international EAN-13 standard strictly requires 12 numeric digits (plus 1 check digit). If your code contains letters or dashes, select CODE-128.
What I would do if I were in your shoes
«If you are setting up internal inventory for your shop or warehouse, keep it simple: select CODE-128 (which accepts letters, hyphens, and numbers), paste your SKU column straight from Excel, and download the Letter-Size PDF ready for sticker paper.» — DataKorex Engineering Team.