ZPL3001 — Parameter is not a number

A numeric parameter holds text that cannot be read as a number. The renderer ignores the value and falls back to the default, silently changing the size or position.

Label that triggers it

^XA^FO50,50^A0N,abc^FDHELLO^FS^XZ

Finding: ZPL3001 · line 1:12 — ^A0 parameter 'h' expects a number; 'abc' will be ignored and the default used

Open the broken label in the editor →

How to fix it

Replace the value with a number. Decimal and exponent forms are accepted because the engine reads them; letters are not.

Corrected label

^XA^FO50,50^A0N,40^FDHELLO^FS^XZ

Open the corrected label in the editor

Commands involved

^A

Related rules

ZPL3002 Parameter out of range

In CI

npx labelixa validate "labels/**/*.zpl" lints your files and prints this page's address next to each finding. /docs/cli

Lint your ZPL now