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.

AXE-CORE Accessibility Audit

MPL 2.0

Abseil

Apache 2.0

Alliance for Open Media Video Codec

BSD

Almost Native Graphics Layer Engine

BSD

Android Explicit Synchronization

Apache 2.0

BoringSSL

BSDish

Brotli

MIT

CRC32C

New BSD

Chromium License

BSD

CodeMirror 6

MIT

Compact Encoding Detection

Apache 2.0

Compact Language Detector v3

Apache 2.0

Crashpad

Apache 2.0

Dawn

Apache 2.0

Devtools-Frontend

BSD

Emoji Segmenter

Apache 2.0

Expat XML Parser

MIT

FP16

MIT

FXDiv

MIT

Fiat-Crypto: Synthesizing Correct-by-Construction Code for Cryptographic Primitives

MIT

FlatBuffers

Apache 2.0

Google Double Conversion

BSD

Headers for the Windows 10 WebAuthn API (webauthn.dll)

MIT

Highway: C++ library for SIMD

Apache 2.0

Lighthouse

Apache License 2.0

Material color utilities

Apache License 2.0

OTS (OpenType Sanitizer)

BSD

One Euro Filter

BSD

PDFium

BSD

PFFFT: a pretty fast FFT.

BSD-like

Perfetto

Apache2

Protocol Buffers

BSD

Recurrent neural network for audio noise reduction

BSD 3-Clause

Snappy: A fast compressor/decompressor

New BSD

The Chromium Project

BSD 3-clause "New" or "Revised" License

The Incremental Distributed Point Functions library

Apache 2.0

V8 fork of fdlibm

fdlibm license

Volk Meta loader for Vulkan API

MIT

Vulkan Deps

BSD

VulkanMemoryAllocator

MIT

WebKit

BSD and LGPL v2 and LGPL v2.1

WebM container parser and writer.

BSD

WebP image encoder/decoder

BSD

WebRTC

BSD

Wuffs (Wrangling Untrusted File Formats Safely)

Apache 2.0

XNNPACK

BSD

Zstandard

BSD and GPLv2

cpuinfo

BSD

dav1d is an AV1 decoder :)

2-Clause BSD

dynamic annotations

BSD

ffmpeg

LGPL 2.1

flac

BSD

fontconfig

MIT

google-glog's symbolization library

BSD

harfbuzz-ng

MIT

hunspell

MPL 1.1/GPL 2.0/LGPL 2.1

icu

MIT

inspector protocol

BSD

ipcz

BSD

jsoncpp

MIT

libavif - Library for extracting metadata from .avif files

2-Clause BSD

libevent

BSD

libgav1

Apache 2.0

libpng

libpng license

libsrtp

3-clause BSD

libvpx

BSD

libxml

MIT

libxslt

MIT

libyuv

BSD

mesa_headers

MIT and SGI Free Software B License Version 2.0

modp base64 decoder

BSD

opus

BSD

pthreadpool

BSD

re2 - an efficient, principled regular expression library

BSD 3-Clause

sqlite

Public domain

woff2

MIT

xdg-mime

Academic Free License version 2.0 or LGPL v2

xdg-user-dirs

MIT

zlib

Custom license

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