01
Annotation Format Converter
Convert one annotation file between COCO, YOLO, Pascal VOC, CVAT, LabelMe, and more.
Open format converterFree dataset tools.
Convert, merge, split, check, and remap annotation files. No sign-up needed.
02
Annotation Merger
Merge many annotation files into one download.
Open annotation merger03
Dataset Splitter
Split a COCO JSON file into train, validation, and test sets.
Open dataset splitter04
Dataset Health Report
Check one annotation file for class imbalance, parse skips, and geometry risks.
Open dataset health report05
Label Mapper / Taxonomy Tool
Rename labels, merge synonyms, drop noisy classes, and assign taxonomy parents.
Open label mapperQuestions
Are these tools free to use?
Yes. There is no paywall, subscription, or sign-up.
Is my dataset uploaded to your servers?
Dataset Splitter processes your COCO file in your browser. Format Converter, Annotation Merger, Dataset Health Report, and Label Mapper send the annotation files you select to LabelOp servers for processing.