Free Online Code 39 Barcode Image Generator

Generating & Printing Code 39 Barcode Images Online Free

Online Code 39 Generator is developed based on OnBarcode Barcode for .NET.


We are providing free online streaming barcode generation service. Now you can generate barcode image through the following url:

To get this free online service, please contact us

Watch a quick video tutorial and get started


The barcode generator is locked, and you cannot change barcode settings. To unlock it, please go to our YouTube online barcode generator video description section to get the free keycode.

Free barcode generator online video tutorial:

Code 39 Barcode Settings
Barcode Encoding Data
Add check sum digit:
(Wide/narrow ratio. Valid value range from 2.0 to 3.0 inclusive)
Show start stop char (*) in text
Process Tilde

Code 39 Barcode Text Style
Show Text
Text margin  
Text Font Name
Text Font Size
Text Font Style
Text Color  

Barcode Colors
Back Color  
Fore Color  

Unlock Keycode
Code 39 Barcode Image Size Settings
Enable Auto Resize
Bar Alignment
Unit of Measure
X (bar module width)  
Y (bar module height)  
Left Margin  
Right Margin  
Top Margin  
Bottom Margin  
Resolution (in dots per inch)
Barcode Image Width

(if image width is smaller than the barcode minimum width, the setting will be ignored)
Barcode Image Height

(if image height is smaller than the barcode minimum height, the setting will be ignored)
Image Format

Online Barcode Generator Supporting Bar Code Types

OnBarcode barcode products

OnBarcode also provides the following libraries and components for generating, printing, scanning, and reading Code 39 barcodes.

Barcode Software & Libraries

OnBarcode provides professional barcode software and libraries for you.

QR Code Software & DLLs

OnBarcode provides reliable & mature QR Code software and dlls for you.

Code 39 Software & Components

OnBarcode provides other Code 39 barcode generator library, component and SDK for you.

  • Code 39 in .NET - how to create 3 of 9 barcode in C#, VB.NET projects with sample codes.
  • Code 39 in Java - how to generate best Barcode 3 of 9 1D barcode images in Java projects with examples.
  • Code 39 in C# - how to print Code 39 barcodes in C# ASP.NET, C# Excel & word using C# sample codings.
  • Code 39 in VB.NET - how to generate Code 39 barcodes in Visual Basic .NET applications with VB.NET samples.

OnBarcode is a market-leading provider of barcode imaging generator, reader controls and components for ASP.NET, Windows Forms, WPF, as well Java, Android, iOS (iPhone, iPad) across all major enterprise development platforms. OnBarcode barcode products are supported by RasterEdge high quality .NET Imaging SDK, Java Imaging Library, and their easy and simple documents, like imaging in C#, imaging in VB.NET.
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