Barcode Generator
Turn a number into a scannable barcode — free, instant, multiple formats.
Turning a Number Into Something a Scanner Can Read
A product SKU, an internal inventory code, or a tracking number is only human-readable until it needs to be scanned quickly and repeatedly — that's exactly what a barcode is for. This tool converts any number or code into a scannable barcode image, generated entirely in your browser and ready to download as a PNG.
How Barcode Encoding Actually Works
A barcode represents data as a specific pattern of varying-width black bars and white spaces, following a defined encoding standard — CODE128, one of the most widely used and flexible formats, can encode letters, numbers, and many symbols, using a specific sequence of bar widths to represent each character according to the standard's published specification. This tool generates that bar pattern directly through client-side JavaScript, rendering it onto a canvas and exporting the result as a downloadable image, with no server-side barcode generation service involved.
A Worked Example
Entering an internal SKU like "SKU-4471-BLK" generates a CODE128 barcode that any standard barcode scanner (in a retail POS system, a warehouse inventory scanner, or even a basic smartphone barcode-reading app) can read back as that exact same string, useful for a small business assigning their own internal tracking codes to inventory without needing an officially registered UPC/EAN retail barcode, which requires purchasing from GS1 and is really meant for products sold through major retail channels.
Who Actually Needs This
Small business owners tracking internal inventory with their own numbering system, not requiring official retail barcodes. Someone organizing a personal collection or home inventory system who wants scannable labels for quick lookup. A small event organizer generating unique ticket or entry codes that can be scanned at check-in. A developer testing how their own barcode-scanning application handles different input formats before deploying it.
Internal Barcodes vs. Official Retail Barcodes
A barcode generated here works perfectly for internal tracking, inventory management, or any closed system where you control both the generation and the scanning — CODE128 patterns are read correctly by any standard scanner regardless of who generated them. What this tool doesn't provide is an officially registered UPC or EAN number recognized by retail point-of-sale systems and major marketplaces, which requires purchasing a registered number through GS1 specifically for products sold through those official retail channels.
Getting a Barcode That Scans Reliably
Print or display the generated barcode at a reasonable size — shrinking a barcode too small can cause the individual bars to blur together when printed, leading to scan failures, especially on lower-quality printers. Testing a printed barcode with an actual scanner or a smartphone scanning app before relying on a full batch of printed labels catches sizing or print-quality issues early, before they become a problem across dozens of labels.
Generated Entirely On Your Device
Barcode rendering runs with client-side JavaScript and canvas drawing — the code or number you're encoding, which may represent internal business data, is never transmitted to a server during generation.
A Second Example
A small library or home collection organizer assigns each book a unique internal code, generating a barcode sticker for each one, then uses a basic scanning app to quickly pull up an item's record by scanning rather than manually typing or searching for it in a spreadsheet — a practical use case that has nothing to do with official retail barcode registration.
Can I use a barcode from this tool to sell products on Amazon or in retail stores?
No — major retail channels generally require an officially registered UPC or EAN number purchased through GS1; this tool generates functional CODE128 barcodes suited for internal tracking, not registered retail product identifiers.
What characters can I encode in a CODE128 barcode?
CODE128 supports letters, numbers, and many common symbols, making it more flexible than number-only barcode formats for encoding alphanumeric internal codes.
Will any barcode scanner be able to read a barcode generated here?
Yes — any standard scanner that supports the CODE128 format will read the generated pattern correctly, regardless of what generated it, since it follows the published open standard.
How large should I print the barcode for reliable scanning?
Avoid shrinking it excessively — very small barcodes risk the individual bars blurring together during printing, which can cause scan failures; test a printed sample before producing a full batch of labels.
Is there a limit to how long a code I can encode?
Longer input strings produce a wider barcode image; there's no strict fixed limit, though very long codes result in a correspondingly wide image that may be less practical for small physical labels.