A laser calibration device comprising: a scanning surface for arranging thereon a calibration substrate an optical detector for scanning a calibration substrate arranged on the scanning surface, wherein the optical detector is movable with respect to the scanning surface with not more than two, preferably not more than one, degree of freedom, wherein the optical detector is movable with respect to the scanning surface in one scanning direction (y) at a separation distance from the scanning surface and/or from a calibration substrate arranged thereon, wherein the separation distance is constant in a direction perpendicular to the scanning surface, wherein the scanning direction (y) is parallel to the scanning surface; and a processing unit functionally connected to the optical detector, characterised in that the processing unit is configured for: - generating pattern generation executable instructions which, when executed by a control unit of one or more laser processing devices of a laser processing apparatus (102-1;...; 102-6), cause the one or more laser processing devices to generate a calibration pattern on a calibration substrate using one or more laser beams deflected by the one or more laser processing devices; - detecting a calibration pattern generated based on the pattern generation executable instructions generated by the processing unit, the calibration pattern being comprised in a calibration substrate scanned by the optical detector; and - based on the detected calibration pattern and on the corresponding pattern generation executable instructions, generating calibration executable instructions which, when executed by said control unit of the one or more laser processing devices of said laser processing apparatus (102-1;...; 102-6), calibrate the one or more laser processing devices of said laser processing apparatus (102-1;...; 102-6); and in that the laser calibration device is structurally independent from the laser processing apparatus (102-1;...; 102-6). a scanning surface for arranging thereon a calibration substrate an optical detector for scanning a calibration substrate arranged on the scanning surface, wherein the optical detector is movable with respect to the scanning surface with not more than two, preferably not more than one, degree of freedom, wherein the optical detector is movable with respect to the scanning surface in one scanning direction (y) at a separation distance from the scanning surface and/or from a calibration substrate arranged thereon, wherein the separation distance is constant in a direction perpendicular to the scanning surface, wherein the scanning direction (y) is parallel to the scanning surface; and a processing unit functionally connected to the optical detector, characterised in that the processing unit is configured for: - generating pattern generation executable instructions which, when executed by a control unit of one or more laser processing devices of a laser processing apparatus (102-1;...; 102-6), cause the one or more laser processing devices to generate a calibration pattern on a calibration substrate using one or more laser beams deflected by the one or more laser processing devices; - detecting a calibration pattern generated based on the pattern generation executable instructions generated by the processing unit, the calibration pattern being comprised in a calibration substrate scanned by the optical detector; and - based on the detected calibration pattern and on the corresponding pattern generation executable instructions, generating calibration executable instructions which, when executed by said control unit of the one or more laser processing devices of said laser processing apparatus (102-1;...; 102-6), calibrate the one or more laser processing devices of said laser processing apparatus (102-1;...; 102-6); and - generating pattern generation executable instructions which, when executed by a control unit of one or more laser processing devices of a laser processing apparatus (102-1;...; 102-6), cause the one or more laser processing devices to generate a calibration pattern on a calibration substrate using one or more laser beams deflected by the one or more laser processing devices; - detecting a calibration pattern generated based on the pattern generation executable instructions generated by the processing unit, the calibration pattern being comprised in a calibration substrate scanned by the optical detector; and - based on the detected calibration pattern and on the corresponding pattern generation executable instructions, generating calibration executable instructions which, when executed by said control unit of the one or more laser processing devices of said laser processing apparatus (102-1;...; 102-6), calibrate the one or more laser processing devices of said laser processing apparatus (102-1;...; 102-6); and in that the laser calibration device is structurally independent from the laser processing apparatus (102-1;...; 102-6).