Hi,

In Odoo Online version 18, you can't install custom barcode modules, so customization is limited. But you still have some options to print bigger barcode labels:

Ways to Customize Barcodes in Odoo Online:

    Use the "Barcode Labels" option

    Go to Inventory > Products, select products, then click Print > Barcode Labels. This prints small labels by default.

    Print on larger paper using PDF settings

    Download the barcode PDF and print it with a larger zoom or scale setting in your printer to make it bigger.

    Use Odoo Studio (if available)

    If you have Odoo Studio, you can make small changes to the label:

        Make the text or barcode bigger

        Change the layout

        But full design changes are not possible in Online.

    Use Excel or Word as a workaround

    Export product data (name + barcode) from Odoo and use Excel or Word label templates to print large barcodes using barcode fonts or images.

    Move to Odoo.sh for full control

    If you need full customization (like big labels, ZPL printer support, or multiple barcodes per page), Odoo.sh lets you install custom barcode templates.

Hope it helps.