HQDFM

HQDFM is a web-based Gerber viewer that utilizes NextPCB's DFM analysis algorithms. It supports Gerber formats (RS-274X, X2), Excellon drill files, and ODB++. It runs on major browsers - Chrome, Safari, Edge, Firefox, Opera - without requiring installation or registration. It performs more than 20 DFM checks to identify manufacturability issues before ordering. It allows you to navigate individual PCB layers and download detailed DFM reports.

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• Multi-layer visualization. Individual navigation through each layer of the PCB with transparency and overlay control. Separate visualization of copper layers, solder mask, silkscreen, and holes.
• Automatic data alignment. Intelligent recognition of Gerber and Excellon files with precise alignment between layers. Automatic identification of layer type and correspondence with drill data.
• Comprehensive DFM analysis. Verification of more than 20 manufacturability parameters including shorts, open circuits, insufficient annular rings, and drill tolerances.
• Distance measurement. Precise measurement tools between design elements with values in metric and imperial units. Verification of minimum spacing between traces and pads.
• Detailed reports. Generation of PDF documents with complete DFM analysis results. Inclusion of images, coordinates of issues, and specific recommendations.
• Multi-format compatibility. Support for Gerber RS-274X, Gerber X2, ODB++, KiCad files, and Excellon formats. Processing of ZIP and RAR compressed files.
• 3D visualization. Three-dimensional representation of the complete assembly with components and layer structure. Rotation and zoom for inspection from different angles.
• Impedance calculator. Determination of characteristic impedance values based on stackup and materials. Configuration of dielectric parameters and trace geometry.
• Panelization analysis. Evaluation of efficiency in the use of manufacturing panels. Calculation of wasted material and optimization of board distribution.
• Solder verification. Inspection of solder mask openings and their correspondence with SMD pads. Detection of copper exposure issues.
• Silkscreen control. Analysis of overlap between silkscreen text and component pads. Verification of readability and positioning of identifying marks.
• Manufacturing integration. Direct transfer of files and parameters to NextPCB ordering systems. Automatic extraction of specifications for quotation.

The development of HQDFM began in 2018 as an internal project at NextPCB to optimize the design review process. NextPCB's manufacturing engineers actively participated in defining requirements and use cases. The application was built using C++ for the processing core and JavaScript for the web interface. The first public version was released in 2020 with basic visualization functionalities. DFM analysis capabilities were progressively integrated based on accumulated production experience.