BiRefNet (AI model)
The background removal models are BiRefNet_HR for hosted photo processing and BiRefNet_lite for local processing, by Peng Zheng, Dehong Gao, Deng-Ping Fan, Li Liu, Jorma Laaksonen, Wanli Ouyang and Nicu Sebe, described in "Bilateral Reference for High-Resolution Dichotomous Image Segmentation" (CAAI Artificial Intelligence Research, 2024). Source: github.com/ZhengPeng7/BiRefNet. For BiRefNet_lite, we converted the published weights to run in the browser (ONNX format, with 8-bit weight storage and a memory-efficient formulation of its deformable convolutions); the model itself is unchanged.
The Max model uses the pinned BiRefNet_HR release.
MIT License
Copyright (c) 2024 ZhengPeng
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
ONNX Runtime Web (runs the model)
ONNX Runtime Web 1.30.0 by Microsoft, used unmodified. Source: github.com/microsoft/onnxruntime.
MIT License
Copyright (c) Microsoft Corporation
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
libheif and libheif-js (opening iPhone HEIC photos)
When a browser cannot open a HEIC photo by itself, the page loads libheif 1.23 (copyright Dirk Farin and the libheif contributors, source: github.com/strukturag/libheif) through libheif-js by Kiril Vatev (source: github.com/catdad-experiments/libheif-js), compiled to WebAssembly. Both are distributed under the GNU Lesser General Public License, version 3 (LGPL-3.0), and are served unmodified as a separate file, /assets/, which you may replace with your own build. The full license text is at gnu.org/licenses/lgpl-3.0.html, and the corresponding source code is available from the projects above or from us on request at hello@backgroundremoverpng.com.
PDF.js (PDF to JPG)
The PDF to JPG converter reads PDFs with PDF.js 6.3.289 by Mozilla (source: github.com/mozilla/pdf.js), licensed under the Apache License 2.0 and served unmodified from /assets/pdfjs/6.3.289/. It comes with parts under their own licenses, each served alongside it with its license file: the OpenJPEG image decoder (2-clause BSD), a JBIG2 image decoder from PDFium (3-clause BSD), the qcms color management library (MIT), Adobe's character maps for Chinese, Japanese and Korean text (3-clause BSD), the Foxit standard fonts from PDFium (3-clause BSD), the Liberation Sans fonts by Red Hat (GNU General Public License version 2 with the font exception; source: github.com/liberationfonts) and a color profile released under CC0. The full license texts are in the same folder, next to each part.
VTracer (PNG to SVG tracing)
The PNG to SVG converter traces images with VTracer 1.0.0-alpha.4 by Visioncortex (source: github.com/visioncortex/vtracer), compiled to WebAssembly and published as @visioncortex/vtracer. Copyright (c) 2024 TSANG, Hao Fung; licensed under MIT or Apache-2.0, used here under the MIT license. The WebAssembly file is unmodified; we changed only its loader so it runs in a browser. It includes Rust libraries such as visioncortex, image, png, gif and wasm-bindgen, each under MIT or Apache-2.0 terms.
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Clipper and earcut (SVG to STL)
The SVG to STL converter joins shapes and outlines strokes with Javascript Clipper 6.4.2.2, Timo's translation of Clipper by Angus Johnson (sourceforge.net/projects/jsclipper, published on npm as clipper-lib), copyright Angus Johnson 2010-2017, used unmodified apart from one line at each end that makes it a JavaScript module. It is licensed under the Boost Software License, Version 1.0:
Boost Software License - Version 1.0 - August 17th, 2003
Permission is hereby granted, free of charge, to any person or organization obtaining a copy of the software and accompanying documentation covered by this license (the "Software") to use, reproduce, display, distribute, execute, and transmit the Software, and to prepare derivative works of the Software, and to permit third-parties to whom the Software is furnished to do so, all subject to the following:
The copyright notices in the Software and this entire statement, including the above license grant, this restriction and the following disclaimer, must be included in all copies of the Software, in whole or in part, and all derivative works of the Software, unless such copies or derivative works are solely in the form of machine-executable object code generated by a source language processor.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Clipper includes Tom Wu's JSBN big-integer code, under this notice:
Copyright (c) 2003-2005 Tom Wu
All Rights Reserved.
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
IN NO EVENT SHALL TOM WU BE LIABLE FOR ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND, OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
In addition, the following condition applies:
All redistributions must retain an intact copy of this copyright notice and disclaimer.
The model's top and bottom faces are triangulated with earcut 3.2.4 by Mapbox (source: github.com/mapbox/earcut), used unmodified, under the ISC License:
ISC License
Copyright (c) 2026, Mapbox
Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
Example photos
The before-and-after examples on the home page use two photos from Wikimedia Commons that their authors released under CC0 (public domain dedication): "Portrait of a labrador retriever" by Dktue and "Ash and orange sneakers" by Clariter1990 (commons.wikimedia.org). The cutouts were made with this site's own tool, scaled down for the page.
The puppy in the hero and Puppy sample was created with OpenAI image generation. Its displayed cutout was made with this site's background remover, without manual touch-ups. It is a generated sample, separate from the two real-photo examples.
Typefaces
Inter is served from this site under the SIL Open Font License 1.1. Your browser does not contact a font provider.