Open source licenses
Last updated: October 2026
postd builds on work that others make freely available. This page lists the components that postd loads into your browser: who made them, under which license they are published, and the full license text. These are the components of “Remove background” (1 to 4), the library for sign-in, database and storage (5), the QR code generator (6), the symbols (7), the fonts (8) and the library for reading HEIC photos (9). The licenses are the MIT License, the ISC License, the Apache License 2.0, the GNU Lesser General Public License 3.0 and the SIL Open Font License 1.1. All of them allow commercial use. Your photo stays on your device with “Remove background”. What else happens is described in the privacy policy.
1. ONNX Runtime Web 1.30.0
The runtime that executes the model in your browser. Author: Microsoft Corporation. License: MIT. Source: github.com/microsoft/onnxruntime, shipped as the package onnxruntime-web. We serve three files unchanged from postd.ai: ort.webgpu.min.mjs, ort-wasm-simd-threaded.asyncify.mjs and ort-wasm-simd-threaded.asyncify.wasm.
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.
The runtime contains components by other authors. Their notices are in the file ThirdPartyNotices.txt, exactly as Microsoft publishes them for this version.
2. BiRefNet, lite variant
The model that separates subject from background. Authors: Peng Zheng, Dehong Gao, Deng-Ping Fan, Li Liu, Jorma Laaksonen, Wanli Ouyang and Nicu Sebe, published in the paper “Bilateral Reference for High-Resolution Dichotomous Image Segmentation” (2024). License: MIT, for the code and for the weights. Source: github.com/ZhengPeng7/BiRefNet and huggingface.co/ZhengPeng7/BiRefNet_lite.
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.
3. Conversion for WebGPU
The file your browser loads is a conversion of this model: ONNX format, half precision (fp16), 1024 pixels. The weights are unchanged. Only the compute graph was rebuilt so that it runs on the graphics unit in the browser. Author of the conversion: jiabins0303. License: MIT, as stated on the model card. Source: huggingface.co/jiabins0303/birefnet-lite-1024-webgpu. The conversion has no license file of its own; the MIT text of BiRefNet above applies to it as well.
The file is called birefnet-lite-1024-fp16.onnx, has 114,834,127 bytes and the SHA-256 checksum 4059896039dfccb0f15b9080ff06d11d90e499449bb045e797055eb8901cf5f4. The editor checks both after loading.
4. Swin Transformer
BiRefNet lite uses the small variant of the Swin Transformer as its backbone. Author: Microsoft Corporation. License: MIT. Source: github.com/microsoft/Swin-Transformer.
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.
5. Supabase JavaScript Client 2.45.4
The library the editor uses to sign you in and to talk to the database and storage. Author: Supabase. Source: github.com/supabase/supabase-js. postd serves it as a single file from postd.ai (assets/vendor/supabase.js), unchanged except for one comment line at the top. The file contains six components by Supabase: supabase-js 2.45.4, auth-js 2.65.0, functions-js 2.4.1, postgrest-js 1.16.1, realtime-js 2.10.2 and storage-js 2.7.0. Five of them are published under the MIT License with the copyright line “Copyright (c) 2020 Supabase”.
MIT License Copyright (c) 2020 Supabase 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.
For storage-js the author’s statements are inconsistent: the package description (package.json) says MIT, but the license file in the package contains the text of the Apache License 2.0, without a copyright holder filled in. We therefore show both statements. Below is the text of the Apache License 2.0 as it ships with the package. All texts are also in the file LIZENZEN.txt.
Apache License Version 2.0, January 2004 http://www.apache.org/licenses/ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 1. Definitions. "License" shall mean the terms and conditions for use, reproduction, and distribution as defined by Sections 1 through 9 of this document. "Licensor" shall mean the copyright owner or entity authorized by the copyright owner that is granting the License. "Legal Entity" shall mean the union of the acting entity and all other entities that control, are controlled by, or are under common control with that entity. For the purposes of this definition, "control" means (i) the power, direct or indirect, to cause the direction or management of such entity, whether by contract or otherwise, or (ii) ownership of fifty percent (50%) or more of the outstanding shares, or (iii) beneficial ownership of such entity. "You" (or "Your") shall mean an individual or Legal Entity exercising permissions granted by this License. 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You are solely responsible for determining the appropriateness of using or redistributing the Work and assume any risks associated with Your exercise of permissions under this License. 8. Limitation of Liability. In no event and under no legal theory, whether in tort (including negligence), contract, or otherwise, unless required by applicable law (such as deliberate and grossly negligent acts) or agreed to in writing, shall any Contributor be liable to You for damages, including any direct, indirect, special, incidental, or consequential damages of any character arising as a result of this License or out of the use or inability to use the Work (including but not limited to damages for loss of goodwill, work stoppage, computer failure or malfunction, or any and all other commercial damages or losses), even if such Contributor has been advised of the possibility of such damages. 9. Accepting Warranty or Additional Liability. While redistributing the Work or Derivative Works thereof, You may choose to offer, and charge a fee for, acceptance of support, warranty, indemnity, or other liability obligations and/or rights consistent with this License. However, in accepting such obligations, You may act only on Your own behalf and on Your sole responsibility, not on behalf of any other Contributor, and only if You agree to indemnify, defend, and hold each Contributor harmless for any liability incurred by, or claims asserted against, such Contributor by reason of your accepting any such warranty or additional liability. END OF TERMS AND CONDITIONS APPENDIX: How to apply the Apache License to your work. To apply the Apache License to your work, attach the following boilerplate notice, with the fields enclosed by brackets "[]" replaced with your own identifying information. (Don't include the brackets!) The text should be enclosed in the appropriate comment syntax for the file format. We also recommend that a file or class name and description of purpose be included on the same "printed page" as the copyright notice for easier identification within third-party archives. Copyright [yyyy] [name of copyright owner] Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
6. QR Code Generator for JavaScript
The library that calculates the dot grid of a QR code when you put a QR code on a slide. Author: Kazuhiko Arase. License: MIT. Source: d-project.com, github.com/kazuhikoarase/qrcode-generator. postd delivers it unchanged as a file from postd.ai (assets/vendor/qrcode.js). “QR Code” is a registered trademark of DENSO WAVE INCORPORATED.
MIT License Copyright (c) 2009 Kazuhiko Arase 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.
7. Lucide icons
The symbols in the side panel (icons, elements, section headers) and the icons you can put on a slide come from Lucide 0.469.0. Author: Lucide Contributors. License: ISC; parts come from Feather by Cole Bemis (MIT). Source: lucide.dev. postd delivers the paths of the symbols used as part of the editor.
ISC License Copyright (c) for portions of Lucide are held by Cole Bemis 2013-2022 as part of Feather (MIT). All other copyright (c) for Lucide are held by Lucide Contributors 2022. 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.
MIT License (Feather) Copyright (c) 2013-2022 Cole Bemis 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.
6. Fonts
The fonts postd serves from postd.ai are in the folders assets/fonts and assets/LOGOS/FONTS. They come from their authors and are all published under the SIL Open Font License 1.1, which also allows commercial use. Below are the copyright lines, as entered in the font files.
Anton: Copyright 2020 The Anton Project Authors (https://github.com/googlefonts/AntonFont.git) Archivo: Copyright 2020 The Archivo Project Authors (https://github.com/Omnibus-Type/Archivo) Big Shoulders Display: Copyright 2019 The Big Shoulders Project Authors (https://github.com/xotypeco/big_shoulders) Bodoni Moda: Copyright 2020 The Bodoni Moda Project Authors (https://github.com/indestructible-type/Bodoni) Bricolage Grotesque: Copyright 2022 The Bricolage Grotesque Project Authors (https://github.com/ateliertriay/bricolage) Cormorant, Cormorant Garamond: Copyright 2015 The Cormorant Project Authors (github.com/CatharsisFonts/Cormorant) Familjen Grotesk: Copyright 2021 The Familjen Grotesk Project Authors (https://github.com/Familjen-Sthlm/Familjen-Grotesk) Fragment Mono: Copyright 2022 The Fragment-Mono Project Authors (https://github.com/weiweihuanghuang/fragment-mono) Fraunces: Copyright 2020 The Fraunces Project Authors (github.com/undercasetype/Fraunces) Funnel Display, Funnel Sans: Copyright 2023 The Funnel Project Authors (https://github.com/Dicotype/Funnel) Geist: Copyright 2024 The Geist Project Authors (https://github.com/vercel/geist-font) Geist Mono: Copyright 2024 The Geist Project Authors (https://github.com/vercel/geist-font.git) Gloock: Copyright 2022 The Gloock Project Authors (https://github.com/duartp/gloock) Hanken Grotesk: Copyright 2021 The Hanken Grotesk Project Authors (https://github.com/marcologous/hanken-grotesk) IBM Plex Mono: Copyright 2017 IBM Corp. All rights reserved. Instrument Sans: Copyright 2022 The Instrument Sans Project Authors (https://github.com/Instrument/instrument-sans) Instrument Serif: Copyright 2022 The Instrument Serif Project Authors (https://github.com/Instrument/instrument-serif) Inter Tight: Copyright 2022 The Inter Project Authors (https://github.com/rsms/inter-tight) Italiana: Copyright (c) 2011 by Santiago Orozco (hi@typemade.mx) with reserved name Italiana JetBrains Mono: Copyright 2020 The JetBrains Mono Project Authors (https://github.com/JetBrains/JetBrainsMono) Krona One: Copyright (c) 2011, Sorkin Type Co (www.sorkintype.com) with Reserved Font Name "Krona". Redaction: © 2019 MCKL. All Rights Reserved. Rethink Sans: Copyright 2022 The Rethink Sans Project Authors (https://github.com/hans-thiessen/Rethink-Sans) Space Grotesk: Copyright 2020 The Space Grotesk Project Authors (https://github.com/floriankarsten/space-grotesk) Space Mono: Copyright 2016 The Space Mono Project Authors (https://github.com/googlefonts/spacemono) Syne: Copyright 2019 The Syne Project Authors (https://gitlab.com/bonjour-monde/fonderie/syne-typeface) Young Serif: Copyright 2023 The Young Serif Project Authors (https://github.com/noirblancrouge/YoungSerif)
The following license text applies to all of these fonts. It is also in the file LIZENZEN.txt, which is in the folder assets/fonts.
This Font Software is licensed under the SIL Open Font License, Version 1.1. This license is copied below, and is also available with a FAQ at: https://openfontlicense.org SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007 PREAMBLE The goals of the Open Font License (OFL) are to stimulate worldwide development of collaborative font projects, to support the font creation efforts of academic and linguistic communities, and to provide a free and open framework in which fonts may be shared and improved in partnership with others. The OFL allows the licensed fonts to be used, studied, modified and redistributed freely as long as they are not sold by themselves. The fonts, including any derivative works, can be bundled, embedded, redistributed and/or sold with any software provided that any reserved names are not used by derivative works. The fonts and derivatives, however, cannot be released under any other type of license. The requirement for fonts to remain under this license does not apply to any document created using the fonts or their derivatives. DEFINITIONS "Font Software" refers to the set of files released by the Copyright Holder(s) under this license and clearly marked as such. This may include source files, build scripts and documentation. "Reserved Font Name" refers to any names specified as such after the copyright statement(s). "Original Version" refers to the collection of Font Software components as distributed by the Copyright Holder(s). "Modified Version" refers to any derivative made by adding to, deleting, or substituting -- in part or in whole -- any of the components of the Original Version, by changing formats or by porting the Font Software to a new environment. "Author" refers to any designer, engineer, programmer, technical writer or other person who contributed to the Font Software. PERMISSION & CONDITIONS Permission is hereby granted, free of charge, to any person obtaining a copy of the Font Software, to use, study, copy, merge, embed, modify, redistribute, and sell modified and unmodified copies of the Font Software, subject to the following conditions: 1) Neither the Font Software nor any of its individual components, in Original or Modified Versions, may be sold by itself. 2) Original or Modified Versions of the Font Software may be bundled, redistributed and/or sold with any software, provided that each copy contains the above copyright notice and this license. These can be included either as stand-alone text files, human-readable headers or in the appropriate machine-readable metadata fields within text or binary files as long as those fields can be easily viewed by the user. 3) No Modified Version of the Font Software may use the Reserved Font Name(s) unless explicit written permission is granted by the corresponding Copyright Holder. This restriction only applies to the primary font name as presented to the users. 4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font Software shall not be used to promote, endorse or advertise any Modified Version, except to acknowledge the contribution(s) of the Copyright Holder(s) and the Author(s) or with their explicit written permission. 5) The Font Software, modified or unmodified, in part or in whole, must be distributed entirely under this license, and must not be distributed under any other license. The requirement for fonts to remain under this license does not apply to any document created using the Font Software. TERMINATION This license becomes null and void if any of the above conditions are not met. DISCLAIMER THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM OTHER DEALINGS IN THE FONT SOFTWARE.
9. libheif 1.23 (reading HEIC photos)
The library that reads HEIC photos from iPhones in browsers that cannot do this themselves. It runs as WebAssembly in your browser and is only loaded when you put a HEIC photo into postd. Your photo stays on your device. Authors: struktur AG and contributors (libheif and the decoder libde265), packaged for the browser by Kiril Vatev (libheif-js 1.23.5). License: GNU Lesser General Public License 3.0 (LGPL-3.0). Source: github.com/strukturag/libheif, github.com/strukturag/libde265 and github.com/catdad-experiments/libheif-js, delivered as the package libheif-js on npm.
We deliver the two files libheif.js and libheif.wasm unchanged from postd.ai (assets/heic/), exactly as they are in the package libheif-js 1.23.5. You can find the full license text as the package ships it at assets/heic/LICENSE-libheif-LGPL-3.0.txt. The LGPL allows commercial use. Because the library sits as a separate, unmodified file next to postd's own code, you can replace it with a version of your own. You can find the source code of the delivered version through the sources named above, and we will also send it to you on request: hello@postd.ai.
Our own code
postd wrote the post-processing of the mask, meaning the smoothing of edges and the removal of color fringes, and the integration into the editor itself.
Questions about these licenses are answered by hello@postd.ai.