Product EAN13 Generator for Odoo 18

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This module adds a button on the product form that generates a valid EAN-13 barcode for the product. If the product is configured as a weighing product (i.e. sold by weight), the module will generate a variable/weighted EAN13 that encodes weight information so it can be used with retail scales / POS systems.

Features

• One-click generation of a standard EAN-13 barcode for product.product / product.template.
• Support for weighted/variable EAN13 when the product flag (e.g. to_weight) is enabled.
• Automatic checksum calculation (EAN-13 mod 10 algorithm).
• Safe operation: does not overwrite an existing barcode unless explicit parameter force=True.
• Code examples for Python and XML to easily add a button in the product form.

Installation

1. Place the module folder in your addons path.
2. Update Apps list and install the module.
3. Open a product and click Generate EAN13.

Usage & Behaviour

On the product form a button named Generate EAN13 will call a server method that:

1. Checks if the product already has a barcode (unless force=True).
2. If product is to_weight (or another boolean custom field), it will create a template GTIN and mark it for variable weight usage; the generated barcode format will reserve digits for weight/price depending on your scale convention.
3. Compute the EAN-13 checksum and write the final 13-digit string to product.barcode.

Technical details

Models: Adds server method on product.template / product.product.

Weighted product handling