Question 1

Which barcode formats does this generator support?

Accepted Answer

Nine common symbologies: EAN-13 (global retail), UPC-A (North American retail), Code 128 (logistics and general-purpose), Code 39 (industrial), ITF and ITF-14 (shipping containers), MSI (warehouse inventory), Pharmacode (pharmaceutical), and Codabar (library and blood banks).

Question 2

Which barcode format should I use?

Accepted Answer

For retail products: EAN-13 outside North America, UPC-A inside. For logistics and shipping labels: Code 128. For internal inventory and asset tracking: Code 39 or Code 128. For pharmacy or specialized industries, pick the format your scanner expects — there's no one-size-fits-all.

Question 3

What input does each format accept?

Accepted Answer

EAN-13 needs 12 or 13 digits (the 13th is an auto-calculated check digit). UPC-A needs 11 or 12. Code 128 accepts any ASCII text up to 256 characters. Code 39 accepts uppercase A-Z, 0-9, and a few symbols (-.$/+%). ITF needs an even number of digits. The form validates input and explains what's wrong when invalid.

Question 4

What size and format does the download come in?

Accepted Answer

PNG (raster) or SVG (vector). Both encode the barcode at whatever bar width and height you choose in the design panel. SVG is recommended for print since it scales without quality loss.

Question 5

Are these barcodes scannable by real-world scanners?

Accepted Answer

Yes — JsBarcode generates spec-compliant barcodes that any standard scanner (handheld POS, smartphone barcode app, conveyor scanner) can read. For mission-critical use (POS, inventory), always test the printed barcode with your actual scanner before relying on it.

Question 6

Is my data sent anywhere?

Accepted Answer

No. Barcode generation runs entirely in your browser using JavaScript. The values you encode never leave your device.

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