免费的在线工具箱

Enter Barcode Content

Barcode Format

Bar Color

Height (80px)

Live PreviewCODE128

About the Barcode Generator

What is a Barcode Generator?

A barcode generator is an online tool that converts numbers, letters, and other information into black-and-white stripe patterns that can be read by scanning devices. This free barcode generator supports 14 international standard barcode formats, with all generation processes completed locally in your browser, ensuring that data is never uploaded to any server and maintaining complete information security. Whether you need barcodes for retail products, logistics and warehousing, library management, or pharmaceutical applications, you can find the right barcode format here. The tool eliminates the need for expensive software or registration, providing a fast and reliable way to create professional barcodes for both personal and commercial use.

Understanding how barcodes work is essential to using them effectively. At its core, a barcode encodes data using a pattern of parallel lines with varying widths and spacings, which represent characters according to specific encoding rules known as symbologies. Each barcode format, or symbology, follows a unique set of standards that define how characters are represented, what character sets are supported, and how check digits are calculated to ensure accuracy. When a barcode is scanned, a laser or camera-based scanner reads the light reflected from the bars and spaces, decodes the pattern, and translates it back into the original data. This technology has become the backbone of modern inventory management, retail point-of-sale systems, and supply chain logistics worldwide.

Supported Barcode Formats Explained

CODE128 Currently Selected

Features: Supports all ASCII characters, high density, variable length, and is the most widely used barcode format.

Use Cases: Logistics tracking, inventory management, asset labeling, and electronic product tags.

Input Requirements: Supports all ASCII characters (numbers, letters, symbols), with no length limit.

CODE39

Features: Supports uppercase letters, numbers, and some symbols (- . $ / + % space), with variable length.

Use Cases: Industrial manufacturing, automotive industry, military identification, and government document tracking.

Input Requirements: Only uppercase letters, numbers, and the symbols - . $ / + % and space are allowed.

EAN-13

Features: 13-digit international product barcode, with the last digit being an automatically calculated check digit.

Use Cases: Retail products, supermarket items, books and periodicals, and import/export trade.

Input Requirements: Must be 12 or 13 digits, containing only numbers.

UPC

Features: 12-digit barcode standard for North American products, compatible with EAN-13.

Use Cases: Retail product identification in the US and Canada, and cross-border e-commerce products.

Input Requirements: Must be 11 or 12 digits, containing only numbers.

EAN-8

Features: 8-digit compressed version of EAN-13, suitable for small products.

Use Cases: Small cosmetics, stationery, cigarettes, chewing gum, and other items with limited packaging space.

Input Requirements: Must be 7 or 8 digits, containing only numbers.

ITF-14

Features: 14-digit barcode for logistics packaging, supporting longer scanning distances.

Use Cases: Outer carton packaging, logistics transportation, warehouse management, and wholesale trade.

Input Requirements: Must be 13 or 14 digits, containing only numbers.

Pharmacode

Features: Encodes numbers from 3 to 131070, a specialized security barcode for the pharmaceutical industry.

Use Cases: Pharmaceutical packaging, medical product traceability, and pharmaceutical production lines.

Input Requirements: Must be an integer between 3 and 131070, containing only numbers.

MSI

Features: Numeric-only barcode that supports multiple check digit algorithms.

Use Cases: Inventory counting, library management, warehouse shelf labeling, and retail stockrooms.

Input Requirements: Only digits are allowed, with no length limit.

How to Use the Barcode Generator

Creating professional barcodes with our free online barcode maker is a straightforward process that requires no technical expertise. Follow these simple steps to generate your barcode instantly. Start by selecting the appropriate barcode format for your specific use case from the dropdown menu, as each format serves different industries and purposes. The format panel will highlight your current selection and display detailed information about requirements and applications. Next, enter your desired content into the input field, following the format-specific validation rules that ensure your barcode will scan correctly on any standard barcode scanner. The tool validates your input in real time, preventing errors before generation. You will see a live preview of your barcode update instantly as you type, allowing you to verify the visual appearance. Finally, customize the bar color and height to meet your design preferences, and click the download button to save your barcode as a high-resolution PNG image suitable for printing on labels, product packaging, or embedding into documents and spreadsheets.

Select the Format: Choose the barcode symbology that matches your industry requirements from the dropdown list.
Enter Content: Type the data you wish to encode, adhering to the format-specific rules displayed below the input field.
Live Preview: See your barcode update in real time, with clear error messages if the input does not meet the format requirements.
Download Image: Save your barcode as a high-quality PNG file for use in printing, graphic design, or digital documents.

Frequently Asked Questions

Is this barcode generator really free to use?

Yes, this barcode generator is completely free with no registration required. You can generate unlimited barcodes in all supported formats without any cost. The tool runs entirely in your browser, so your data remains private and is never uploaded to external servers.

Which barcode format should I choose for retail products?

For retail products sold internationally, EAN-13 is the standard choice and is used on most consumer goods worldwide. For products sold primarily in North America, UPC barcodes are the retail standard. Both formats are widely recognized by point-of-sale systems and barcode scanners, ensuring smooth checkout experiences.

How do I create a barcode for my small business inventory?

To create a barcode for inventory management, first select a format suitable for internal use, such as CODE128 or CODE39. CODE128 is often recommended for its high data density and support for alphanumeric characters, making it ideal for encoding product SKUs and batch numbers. Simply enter your inventory codes and download the resulting barcode image for printing on labels.

What is the difference between CODE128 and CODE39 barcodes?

CODE128 supports all 128 ASCII characters and produces denser, more compact barcodes than CODE39. CODE39, by contrast, is limited to uppercase letters, numbers, and a few symbols, but it remains popular in industrial and government applications due to its simplicity and reliability. For most general purposes, CODE128 is the better choice because it encodes more data in less space.

Can I use these barcodes for commercial products?

Absolutely. The barcodes generated by this tool adhere to international standards for each symbology. However, for retail products requiring unique GTINs or UPC codes, you must obtain official numbers from GS1 or the appropriate registration authority. The tool faithfully generates the correct barcode image for any valid number you provide.

Does the tool support generating barcodes in bulk?

This online tool generates one barcode at a time, which is ideal for small to medium barcode creation tasks. If you need to generate barcodes in bulk for larger inventory or product line projects, you may want to explore dedicated barcode software or spreadsheet-based solutions that can process multiple entries simultaneously.

What resolution will my downloaded barcode image be?

The tool renders barcodes as vector SVG graphics in the browser and converts them to PNG upon download at the display resolution. The resulting image is clear and suitable for most digital and print applications. For the highest quality printing, we recommend using the largest preview size before downloading.

Are there any limitations on barcode length or content?

Each barcode format has its own rules regarding content and length. CODE128 is very flexible and supports full ASCII, while numeric formats like EAN-13 and UPC have strict digit counts. The tool provides real-time validation and helpful error messages so you always know if your input meets the requirements for the selected format.

About the Barcode Generator

What is a Barcode Generator?

Supported Barcode Formats Explained

CODE128 Currently Selected

CODE39

EAN-13

UPC

EAN-8

ITF-14

Pharmacode

MSI

How to Use the Barcode Generator

Frequently Asked Questions

Is this barcode generator really free to use?

Which barcode format should I choose for retail products?

How do I create a barcode for my small business inventory?

What is the difference between CODE128 and CODE39 barcodes?

Can I use these barcodes for commercial products?

Does the tool support generating barcodes in bulk?

What resolution will my downloaded barcode image be?

Are there any limitations on barcode length or content?

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