Free tool
Label Mapper / Taxonomy Tool
Audit the class names in one annotation file, rename or merge inconsistent labels, and download a corrected file before training.
Map labels and taxonomy
Upload one annotation file, clean inconsistent labels, preview the impact, and download a corrected export.
One annotation file
COCO JSON, CVAT XML, Pascal VOC XML, LabelMe JSON, CSV, TSV, or JSONL. Up to 10 MB.
Optional target labels
Frequently asked questions
- How do I rename or merge classes in an annotation file?
- Upload the file, review the detected labels, and map each one to its new name. Mapping several labels to the same name merges them into one class. You can preview how many annotations change before downloading the corrected file.
- Which formats does the label mapper support?
- COCO JSON, CVAT XML, Pascal VOC XML, LabelMe JSON, CSV, TSV, and JSONL files of up to 10 MB.
- What is a taxonomy parent?
- A taxonomy parent groups related classes under a broader label, such as car and truck under vehicle. It keeps your class list consistent as the dataset grows.
- Are my files uploaded?
- The files you select are sent to LabelOp servers for processing, and the result comes back as a download. You do not need an account.