U²-Net#
Classic salient-object / background-removal network. Default model in many rembg setups.
Compare to withoutBG Open on the side-by-side page. Product hub: /open-model.
- Family
- U²-Net
- License
- Apache-2.0 · commercially usable
- Deploy
- ONNX · rembg `u2net`
- Input / size
- 320×320 · ~176 MB ONNX (rembg release)
Quick take
- Best for: General rembg default workloads and baselines
- Avoid when: You need finer hair or modern BiRefNet-class edges
- Notes: Available as rembg session `u2net`.
Evidence
Visual comparison on Bench v0 (same images for every model), with MAE / MGE / connectivity when ground truth is available.