Open Source Software

Last updated: 2026-07-10

Text Editor is an in-browser text and code editor. It is built with help from the open-source components listed below, and this page credits the authors and maintainers who make them available. Each component is governed by its own license terms, summarized in the tables that follow.

Editor and Preview Libraries

LibraryVersionPurposeLicenseCopyright
Ace1.44.0Text and code editorBSD 3-ClauseCopyright © Ajax.org B.V.
marked15.0.12Markdown renderingMITCopyright © 2011-2025 Christopher Jeffrey and contributors
DOMPurify3.3.2HTML sanitization for rendered previewsApache 2.0 or MPL 2.0Copyright © Cure53 and other contributors
Papa Parse5.5.3CSV parsing for previewsMITCopyright © Matthew Holt
LaTeX.js0.12.6LaTeX-to-HTML rendering for previewsMITCopyright © Michael Brade (bundles KaTeX, he, and web fonts - see Fonts section)
KaTeX0.13.13Math typesetting (bundled by LaTeX.js)MITCopyright © Khan Academy and contributors
he1.2.0HTML-entity encoding and decoding (bundled by LaTeX.js)MITCopyright © Mathias Bynens
RTFJS / EMFJS / WMFJS-RTF rendering for previewsMITCopyright © 2015-2020 Thomas Bluemel, Tom Zoehner, and Ynse Hoornenborg
SheetJS js-codepage1.15.0Code-page tables for RTF text decoding (bundled inside RTFJS)Apache 2.0Copyright © 2013-present SheetJS

Utility Libraries

LibraryVersionPurposeLicenseCopyright
jschardet3.1.4Character-encoding detection for opened filesLGPL 2.1 or laterCopyright © Mark Pilgrim and Antonio Afonso (JavaScript port of Mozilla's universalchardet)

Fonts

FontPurposeLicenseAttribution
RobotoApplication and site UI typographyApache 2.0Copyright © Google LLC
Roboto MonoEditor font option and monospaced UI text (self-hosted)Apache 2.0Copyright © Google LLC
JetBrains MonoEditor font option (self-hosted, loaded on demand)SIL Open Font License 1.1Copyright © 2020 The JetBrains Mono Project Authors (github.com/JetBrains/JetBrainsMono)
Fira CodeEditor font option (self-hosted, loaded on demand)SIL Open Font License 1.1Copyright © 2014 The Fira Code Project Authors (github.com/tonsky/FiraCode)
Google Material Icons (outlined and filled)Icon glyphs in application and site UIApache 2.0Copyright © Google LLC
Computer Modern Unicode & KaTeX fontsLaTeX preview rendering (bundled with LaTeX.js)SIL Open Font License 1.1Original Computer Modern by Donald E. Knuth; Computer Modern Unicode Copyright © 2003-2009 Andrey V. Panov, with additional weights by the authors listed in the bundled OFL.txt; KaTeX fonts Copyright © Khan Academy and contributors

License Texts

MIT License

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.

Apache License 2.0

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.

BSD 3-Clause License

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this
   list of conditions and the following disclaimer.

2. Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.

3. Neither the name of the copyright holder nor the names of its contributors
   may be used to endorse or promote products derived from this software
   without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

LGPL 2.1 or later

jschardet is licensed under the GNU Lesser General Public License, version 2.1 or (at your option) any later version. The full license text is long, so it is referenced here rather than reproduced - as the LGPL itself permits. The canonical text is available at:
https://www.gnu.org/licenses/old-licenses/lgpl-2.1.html

Mozilla Public License 2.0

The full text of the Mozilla Public License 2.0 is available at:
https://www.mozilla.org/en-US/MPL/2.0/

SIL Open Font License 1.1

The full text of the SIL Open Font License 1.1 is available at:
https://scripts.sil.org/OFL