Generate CODE128, EAN-13, UPC and other standard barcodes as PNG.
Output settings
Free file tool
Free Barcode Generator online
Generate CODE128, EAN-13, UPC and other standard barcodes as PNG. Use the tool directly in your browser with no sign-up. It is designed for one source at a time so the workflow stays simple and easy to verify.
Free to use
No payment required for this tool.
One source at a time
Process and verify one source before the next.
Browser-based
The conversion workflow runs from the web page on your device.
No sign-up
Start the file workflow without creating an account.
What Barcode Generator is useful for
✓Creating scannable codes for print or screens
✓Encoding an exact URL or identifier
✓Generating a downloadable code image
Input and output checks
Accepted input: Text or settings entered on the page.
✓Open the downloaded output before deleting or replacing the source file.
✓Check the details that matter for your use: page count, dimensions, orientation, text, duration or metadata.
✓If quality or size matters, compare more than one settings combination before choosing the final copy.
How to use this calculator: Barcode Generator
1Enter your content in the output settings panel.
2Review the detected file information — size, type, resolution or page count.
3Tune the output settings to match what you need.
4Press Convert and watch the progress bar; processing happens locally in your browser.
5Download individual results, or use Download All to get a ZIP of everything.
Worked conversion example
Example: enter the exact URL or identifier, select output size, generate the code, and scan the download with a second device before printing or publishing.
Accepted input
Text or settings entered on the page
Batch behaviour
One source at a time
Output settings
Setting
Example/default
Effect
Value
UCP-123456
Changes how the output is encoded or arranged; preview the result before relying on it.
Symbology
CODE128
Changes how the output is encoded or arranged; preview the result before relying on it.
Bar height (px)
100
Changes how the output is encoded or arranged; preview the result before relying on it.
Show value text
true
Changes how the output is encoded or arranged; preview the result before relying on it.
How the browser process works
Generate CODE128, EAN-13, UPC and other standard barcodes as PNG. The page sends the selected file and settings to its barcode-generate browser engine, creates a new output and downloads it without overwriting the source.
Privacy, quality checks and limitations
Keep the original file until the downloaded output has been opened and checked.
Verify page count, orientation, dimensions, text legibility, audio/video duration and metadata relevant to your use.
Browser-local processing reduces routine upload exposure, but your device, browser extensions and download location still matter.
A converted preview is not proof of legal authenticity, archival compliance, accessibility or digital-signature validity.
Frequently asked questions
Is Barcode Generator free to use?
Yes. You can use Barcode Generator on OneCalcApp without paying or creating an account.
Can I process multiple files with Barcode Generator?
This tool is designed around one source at a time. Finish and download the current result before starting another source.
Do I need to sign in?
No. The conversion workflow can be used without signing in.
What should I check after conversion?
Open the downloaded output and compare the page count, dimensions, orientation, text readability, duration or other details that matter for your file type before replacing the original.
Does the tool overwrite my original file?
No. The tool creates a new output for download, so keep your original source until you have checked the converted result.
