Free Online Barcode Generator

Code 128 is the most versatile and supports full ASCII — use it for general purposes, shipping labels, and internal tracking. EAN-13 is the international retail standard (13 digits). UPC-A is used for US and Canadian retail products (12 digits). Code 39 is popular in non-retail industries like healthcare and defense. ITF (Interleaved 2 of 5) is common on shipping cartons. Codabar is used in libraries, blood banks, and FedEx airbills.

Select the EAN-13 format, then enter 12 or 13 digits. If you enter 12 digits, the check digit is calculated automatically. If you enter 13 digits, the tool validates that your check digit is correct. The barcode includes left guard, center guard, and right guard patterns as required by the standard.

Yes. Switch to Bulk Mode, enter one value per line in the text area, and click Generate All. Each barcode is rendered individually and can be downloaded separately or all at once as a ZIP file.

Code 128 encodes the full ASCII character set (128 characters) and produces compact barcodes. It uses a modulo-103 checksum. Code 39 only encodes uppercase letters, digits, and a few special characters (-, ., $, /, +, %, space). Code 39 barcodes are wider but do not require a checksum, making them simpler to implement.

Yes. All barcodes are generated following the exact encoding specifications for each format, including proper guard patterns, checksums, and quiet zones. They scan correctly with standard barcode readers. Make sure to maintain adequate contrast between foreground and background colors.

A check digit is an extra digit appended to a barcode value for error detection. For EAN-13 and UPC-A, it uses a weighted sum algorithm: odd-position digits are multiplied by 1 and even-position digits by 3, summed, and the check digit is (10 - sum mod 10) mod 10. This tool calculates it automatically.

Yes. You can adjust bar width (1-4 pixels), height (50-200 pixels), foreground and background colors, margin size, whether text appears below the barcode, and the font size of the text. All changes preview instantly.

Yes, completely free with no limits, no signup, and no watermarks. All barcode generation happens in your browser — your data never leaves your device. Generate as many barcodes as you need.