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Barcode Generator

Make UPC, EAN, Code 128, Code 39 and 5 other barcode formats — runs in your browser.

General-purpose; any printable ASCII

Display options

Everything runs in your browser. Nothing is uploaded.

What is barcode generator?

A barcode generator turns a string of text or digits into the black-and-white striped pattern that retail scanners, shipping conveyors, and inventory systems read optically. This tool covers the 8 most-used 1D (linear) barcode formats: UPC-A (North American retail), EAN-13 and EAN-8 (international retail), ITF-14 (shipping cartons), Code 128 and Code 39 (general-purpose), Codabar (libraries and medical), and MSI Plessey (warehouse).

Pick a format from the dropdown and the input updates with a sample value for that format. Type your own data and the live preview redraws as you type. The check-digit formats (UPC, EAN, ITF-14) automatically compute the trailing check digit if you only enter the data digits — or validate it and offer to correct it if you enter a full code with a wrong digit.

Everything runs in your browser — what you type never leaves your device. Downloads are PNG (for screenshots, listings, emails) and SVG (for design tools and lossless scaling).

For UPC-A specifically, the dedicated UPC generator offers a richer mismatch experience and product-code guidance focused on retail use. The page you’re on is the right starting point for everything else.

When to use a barcode generator

  • Inventory and warehouse labels — Print Code 128 or Code 39 barcodes from your in-house SKU numbers for picking workflows, asset tagging, and stock counts. No GS1 registration needed for internal use.
  • Event badges and tickets — Generate Code 128 barcodes from attendee IDs or ticket codes for conference check-in, museum admission, or class attendance scanners. Each badge gets a unique scannable code.
  • Product prototyping and packaging mockups — Drop a real-looking UPC, EAN-13, or ITF-14 barcode onto comp art before manufacturing. Use the SVG download to scale to any print size without quality loss.

How to use the Barcode Generator

  1. Pick the format — Choose from UPC-A, EAN-13, EAN-8, ITF-14, Code 128, Code 39, Codabar, or MSI Plessey. The hint below the dropdown explains what each format expects.
  2. Type or paste your data — The input updates the live preview as you type. Check-digit formats (UPC, EAN, ITF-14) accept either the raw data or the full code with check digit; we'll compute or validate it for you.
  3. Download as PNG or SVG — PNG for screenshots and listing photos (1×, 2×, or 4× size). SVG for design tools that scale without quality loss. Copy the encoded data to clipboard with the Copy button.

Worked examples

Code 128 — any text

Input:  HELLO-2026
Output: Standard Code 128 barcode encoding the literal string

EAN-13 — auto check digit

Input:  590123412345
Output: Full 13-digit EAN-13 barcode: 5901234123457 (check digit 7 added)

Code 39 — uppercase only

Input:  PART-12345
Output: Code 39 barcode wrapped with implicit start/stop characters

Frequently asked questions

Which barcode format should I use?
Code 128 for general-purpose alphanumeric data — the most flexible and densest 1D format. Code 39 for uppercase-only inventory tags (older but widely supported). UPC-A or EAN-13 for retail products (requires a GS1-issued prefix to sell on Amazon/Walmart). ITF-14 for shipping cartons. Codabar for libraries and medical labs. MSI Plessey for warehouse shelf labels. If you're unsure, Code 128 is the right default for non-retail use.
Why won't my Code 39 input accept lowercase letters?
Code 39 only encodes uppercase letters A–Z, digits 0–9, and the symbols - . space $ / + %. That's the complete character set defined by the standard. Lowercase letters don't exist in Code 39's encoding tables. If you need lowercase or extended ASCII, use Code 128 instead.
What is a check digit?
A single digit appended to the end of UPC, EAN, and ITF-14 barcodes that lets a scanner detect read errors. It's computed from the other digits via a Modulo-10 weighted sum: from the right, alternate weights of 3 and 1, sum the products, and the check digit is whatever makes the total a multiple of 10. If you enter the data without the check digit, this tool computes it for you. If you enter the full code with a wrong check digit, it offers to either fix it or render exactly what you typed.
Can I use a generated UPC to sell products on Amazon or Walmart?
Only if you already own the GS1 prefix the number is built on. Amazon and Walmart both require GS1-issued UPCs and check them against the GS1 GEPIR registry. Renderings from this tool are valid barcodes — they will scan correctly — but they don't grant rights to a UPC you haven't been assigned. If you specifically want UPC-A with check-digit autocorrect, use the dedicated UPC generator. To register a real prefix, contact GS1.
What about QR codes or 2D barcodes?
This tool generates 1D linear barcodes — the kind you see on retail products and shipping labels. QR codes, Data Matrix, PDF417, and Aztec are 2D codes with a very different UX (size, error-correction levels, content type: URL/text/wifi/contact). They warrant a dedicated tool, which we'll build separately. For now, this page covers the 8 most common 1D formats.
Which format is the highest density?
Code 128, by a comfortable margin. It uses 11-module-wide patterns to encode each character (vs Code 39's 13), and supports a numeric-only Mode C that packs two digits per character — so a 12-digit numeric string encodes in roughly half the width of a Code 39 equivalent. For mixed alphanumeric data, Code 128 is also the most compact choice.
PNG or SVG — which should I download?
PNG for anywhere you'd send a screenshot — Slack messages, listing photos, email attachments. The 4× option produces a high-resolution bitmap that prints crisply. SVG for design tools (Figma, Illustrator, Inkscape) and any case where the barcode might be resized — vector format scales to any size without quality loss.
What size should I print a barcode at?
Depends on the format. UPC-A's GS1 nominal size is 1.469″ × 1.020″; print no smaller than 80% of that. EAN-13's nominal is 1.469″ × 1.014″ at the same 80–200% scaling rule. ITF-14 shipping codes are 1.5″ × 0.5″ minimum, much larger when on cartons. Code 128 and Code 39 have no fixed size, but the bar height should be at least 15% of the barcode's width (or 0.25″, whichever is greater) for reliable scanning.

UPC Generator

Generate a UPC-A barcode from any 11 or 12 digit number — runs in your browser.