Using the wrong printer DPI
The same dot coordinates produce a different physical size at 203, 300 or 600 DPI.
Design a label using safe elements and let BatchLabel translate the supported subset into predictable ZPL. Values are escaped rather than treated as commands, and the result is available for inspection before you send it through your own printer workflow.
^XA
^FX BatchLabel project v1; test this output on the target printer before a full run.^FS
^CI28
^PW400
^LL240
^LH0,0
^FO24,112^BY2^BCN,132,Y,N,N^FDDEMO-SKU-0042^FS
^XZA practical workflow
Match the printer configuration so millimetres convert to the intended dot coordinates.
Place text and barcodes in the visual editor; spreadsheet values remain data, never raw ZPL.
Download the generated commands and test one label through the printer's approved connection method.
Avoid rework
The same dot coordinates produce a different physical size at 203, 300 or 600 DPI.
Caret or tilde characters can change printer instructions when concatenated without escaping.
Output is compatible with supported ZPL workflows but is not an endorsement or certification by a printer manufacturer.
Fonts, firmware and installed printer resources can change the physical result; test the target device.
Questions, answered
No. The browser downloads ZPL. How it reaches the printer depends on your trusted local print setup and is outside the local web application's scope.
No. The generator intentionally emits a documented subset for the elements it can validate. It does not execute or preserve arbitrary commands from imported data.