PixLab Annotate

What PixLab Annotate is

PixLab Annotate is a free browser-based image labeler for preparing machine-learning datasets with bounding boxes and polygon segmentation labels. Multiple images can be selected from a device folder and handled sequentially in the browser. Rectangle and polygon tools are joined by zoom, drag, full-screen display, snapshots, and an eraser. Labels can be named and assigned colors, with annotation history plus undo and redo for revisions. The tool exports structured JSON containing annotation coordinates, rectangle geometry, and label metadata for adaptation to a machine-learning pipeline. PixLab says source images are processed in the browser rather than transferred to its servers. Annotation state is stored in browser storage and can resume in the same browser on the same device; clearing that storage removes saved work. No account is required to load images, create labels, or export data. PixLab describes uses including dataset preparation, QA review, research, development, and classroom training.