Qt WebEngine Licensing

The Qt WebEngine module uses Chromium to provide most of its functionality. During the build process, Chromium becomes a part of the Qt WebEngine Core library. Therefore, when distributing Qt WebEngine, users need to comply to both the licenses of the Qt WebEngine part as developed under the Qt Project, as well as the licenses that are part of Chromium.

The Qt specific parts of the Qt WebEngine module are available under commercial licenses from The Qt Company. Alternatively, they are available under GNU Lesser General Public License v3.0, or GNU General Public License v3.0, or GNU General Public License v2.0.

The Chromium part contains code available under various licenses, with the most restrictive license being the GNU Lesser General Public License v2.1 (LGPL 2.1). For a full list, see Third-Party Licenses below.

Complying with LGPL 2.1

The Qt Company allows commercial customers to distribute the source code of the Qt WebEngine module alongside the Qt WebEngine binaries, and allows recipients to customize and build Qt WebEngine from sources. This includes building and using such a modified Qt WebEngine with an application or system using an otherwise commercially licensed Qt.

The Qt Company also keeps the Qt specific parts of the Qt WebEngine module available under the GNU Lesser General Public License v3.0, or the GNU General Public License v3.0, or the GNU General Public License v2.0, even if WebEngine is released as part of a commercial-only Long-Term Support release (LTS, see also Long-Term Support releases).

Third-Party Licenses

Third party licenses included in the sources as part of Chromium are found below.

Note: Any GPL licenses listed below are only used to access Linux system resources. The Qt WebEngine libraries and plugins does not link to nor distribute GPL binary code, and it does not affect users of Qt WebEngine.

@puppeteer/replay	Apache-2.0
@vscode/web-custom-data	MIT
AXE-CORE Accessibility Audit	MPL 2.0
Abseil	Apache-2.0
Abseil	Apache-2.0
Acorn, a tiny, fast JavaScript parser written in JavaScript.	MIT
Alliance for Open Media Video Codec	BSD-2-Clause, Patent
Alliance for Open Media Video Codec	BSD-2-Clause, Patent
Almost Native Graphics Layer Engine	BSD
Android Explicit Synchronization	Apache-2.0
Android Explicit Synchronization	Apache-2.0
BoringSSL	MIT, BSD-3-Clause, OpenSSL, ISC, SSLeay
BoringSSL	MIT, BSD-3-Clause, OpenSSL, ISC, SSLeay
Brotli	MIT
Brotli	MIT
C++ Signal/Slot Library	Ignorable
C++ Signal/Slot Library	Ignorable
CRC32C	BSD-3-Clause
CRC32C	BSD-3-Clause
CSP Evaluator Core Library, a tool that allows developers to check if a Content Security Policy (CSP) serves as mitigation against XSS attacks	Apache
Chromium License	BSD
CityHash	MIT
CityHash	MIT
CodeMirror 5	MIT
CodeMirror 6	MIT
Compact Encoding Detection	Apache-2.0
Compact Encoding Detection	Apache-2.0
Compact Language Detector v3	Apache-2.0
Crashpad	Apache-2.0
Crashpad	Apache-2.0
Dawn	BSD 3-Clause
Devtools-Frontend	BSD-3-Clause
Emoji Segmenter	Apache-2.0
Expat XML Parser	MIT
Expat XML Parser	MIT
FP16	MIT
Fiat-Crypto: Synthesizing Correct-by-Construction Code for Cryptographic Primitives	Apache 2.0
Fiat-Crypto: Synthesizing Correct-by-Construction Code for Cryptographic Primitives	Apache 2.0
FlatBuffers	Apache-2.0
General Purpose FFT (Fast Fourier/Cosine/Sine Transform) Package	Custome license
General Purpose FFT (Fast Fourier/Cosine/Sine Transform) Package	Custome license
Google Double Conversion	BSD-3-Clause
Google Double Conversion	BSD-3-Clause
Headers for the Windows 10 WebAuthn API (webauthn.dll)	MIT
Highway: C++ library for SIMD	Apache-2.0
Implementation of WebDriver BiDi standard	Apache 2.0
Ink	Apache-2.0
Ink Stroke Modeler	Apache-2.0
LevelDB: A Fast Persistent Key-Value Store	BSD-3-Clause
Libtess2	SGI Free Software License B
Lighthouse	Apache License 2.0
Lighthouse i18n.js	Apache License 2.0
Lit	BSD-3-Clause
Lit	BSD-3
Lit	BSD-3-Clause
Marked	MIT
Material color utilities	Apache-2.0
Metrics Protos	BSD-3-Clause
Metrics Protos	BSD-3-Clause
NVidia Control X Extension Library	MIT
OTS (OpenType Sanitizer)	BSD-3-Clause
One Euro Filter	BSD-3-Clause
PDFium	BSD
PFFFT: a pretty fast FFT.	pffft
PFFFT: a pretty fast FFT.	pffft
PSM (Private Set Membership) client side	Apache-2.0
Paul Hsieh's SuperFastHash	BSD-3-Clause
Paul Hsieh's SuperFastHash	BSD-3-Clause
Perfetto	Apache2
Perfetto	Apache2
Polymer	BSD-3-Clause
Polymer	BSD-3-Clause
Protocol Buffers	BSD-3-Clause
Protocol Buffers	BSD-3-Clause
Protocol Buffers (javascript)	BSD-3-Clause
Protocol Buffers (javascript)	BSD-3-Clause
Puppeteer Core	Apache-2.0
QUICHE	BSD-3-Clause
QUICHE	BSD-3-Clause
Recurrent neural network for audio noise reduction	BSD-3-Clause
Recurrent neural network for audio noise reduction	BSD-3-Clause
SPIR-V Headers	Apache-2.0
SPIR-V Tools	Apache-2.0
Search Engines resources	BSD-3-Clause
Selenium Atoms	Apache-2.0
Simple Homomorphic Encryption Library with Lattices	Apache-2.0
Sizzle	MIT
Snappy: A fast compressor/decompressor	BSD-3-Clause, CC-BY-4.0, MIT, CC-BY-3.0
Speech Dispatcher	LGPL-2.1
The Chromium Project	BSD 3-clause "New" or "Revised" License
The Chromium Project	BSD 3-clause "New" or "Revised" License
The Diff Match and Patch libraries offer robust algorithms to perform the operations required for synchronizing plain text.	Apache License 2.0
The Incremental Distributed Point Functions library	Apache-2.0
URI Template Parser	Apache-2.0
URI Template Parser	Apache-2.0
URL Pattern Library	MIT
URL Pattern Library	MIT
V8 fork of fdlibm	SunPro
Volk Meta loader for Vulkan API	MIT
Vulkan API headers	Apache-2.0
Vulkan API headers	Apache-2.0
Vulkan Loader Components	Apache-2.0
VulkanMemoryAllocator	MIT
Wasmparser	Apache
Web Vitals	Apache
WebKit	BSD and LGPL v2 and LGPL v2.1
WebKit	BSD and LGPL v2 and LGPL v2.1
WebM container parser and writer.	BSD-3-Clause, Patent
WebP image encoder/decoder	BSD-3-Clause, Patent
WebP image encoder/decoder	BSD-3-Clause, Patent
WebRTC	BSD
WebRTC	BSD
Wicked Good XPath	MIT
Wuffs (Wrangling Untrusted File Formats Safely)	Apache-2.0
Wuffs (Wrangling Untrusted File Formats Safely)	Apache-2.0
Zstandard	BSD-3-Clause
Zstandard	BSD-3-Clause
cpuinfo	BSD-2-Clause
d3	ISC
d3	ISC
dav1d is an AV1 decoder :)	BSD-2-Clause
dav1d is an AV1 decoder :)	BSD-2-Clause
fast_float	MIT
ffmpeg	LGPL 2.1
fft	Custom license
fft	Custom license
flac	BSD
fontconfig	public-domain-md5, MIT-Modern-Variant, HPND-sell-variant, MIT
fontconfig	public-domain-md5, MIT-Modern-Variant, HPND-sell-variant, MIT
google-glog's symbolization library	BSD-3-Clause
google-glog's symbolization library	BSD-3-Clause
harfbuzz-ng	MIT-Modern-Variant
harfbuzz-ng	MIT-Modern-Variant
hunspell	MPL-1.1
icu	MIT
icu	MIT
inspector protocol	BSD-3-Clause
inspector protocol	BSD
intl-messageformat	New BSD
ipcz	BSD
ipcz	BSD
json5	MIT
jsoncpp	JsonCPP
jsoncpp	JsonCPP
libaddressinput	Apache-2.0
libavif - Library for encoding and decoding .avif files	BSD-2-Clause, MIT
libgav1	Apache-2.0
libpng	Libpng-2.0, Libpng
libpng	Libpng-2.0, Libpng
libsrtp	3-clause BSD
libsrtp	3-clause BSD
libvpx	BSD-3-Clause, Patent
libvpx	BSD-3-Clause, Patent
libxml	MIT
libxslt	X11
libyuv	BSD
libyuv	BSD
mesa_headers	MIT, SGI-B-2.0
minigbm	BSD-3-Clause
mitt	MIT
modp base64 decoder	BSD-3-Clause
modp base64 decoder	BSD-3-Clause
opus	Opus-Patent-BSD-3-Clause
opus	Opus-Patent-BSD-3-Clause
rapidhash	BSD-2-Clause
re2 - an efficient, principled regular expression library	BSD-3-Clause
re2 - an efficient, principled regular expression library	BSD-3-Clause
simdutf unicode transcoder	MIT
simdutf unicode transcoder	MIT
spl sqrt floor	SPL-SQRT-FLOOR
spl sqrt floor	SPL-SQRT-FLOOR
sqlite	blessing
sqlite	blessing
third-party-web	MIT
woff2	MIT
xdg-user-dirs	MIT
xdg-user-dirs	MIT
zlib	Zlib
zlib	Zlib
zod	MIT

Upgrading from Qt 5 Chromium License

© 2025 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners.