Qt 6.12 LTS brings CRA compliance, QML hot reload, Qt Canvas Painter and HarmonyOS support

The Qt Company has officially released Qt 6.12, its latest Long-Term Support (LTS) version of the widely-used cross-platform application development framework. The release represents a significant milestone for enterprise developers, offering a five-year maintenance window designed to ensure stability and reliability for proprietary software projects. Qt 6.12 arrives two years after its predecessor and continues the company's biennial LTS cadence, which allows organizations to plan upgrades in a structured manner while maintaining overlapping support periods between versions.

The headline feature of Qt 6.12 is its enhanced cybersecurity posture, which brings the framework into compliance with the European Union's Cyber Resilience Act (CRA), a regulatory requirement affecting proprietary products sold within EU markets. Beyond regulatory alignment, the security improvements benefit all users regardless of geographic location. On the development front, Qt Canvas Painter has graduated from technical preview to production-ready status, delivering accelerated imperative painting capabilities that improve graph rendering performance. A new QML Canvas2D type simplifies canvas integration for developers working with Qt's declarative UI framework. Additionally, Qt 6.12 marks HarmonyOS as an officially supported LTS platform, joining Qt's established ecosystem of major operating systems and extending the framework's reach into Huawei's rapidly growing mobile and IoT ecosystem.

For developers focused on workflow efficiency, Qt 6.12 introduces hot reload functionality for QML, streamlining the development process by allowing real-time code changes without restarting applications. The release also emphasizes a less complex tech stack overall, reducing dependencies and simplifying maintenance for teams managing large-scale projects. Further refinements span Qt Quick components, WebAssembly support for browser-based deployment, and overall resource reduction to deliver leaner, more performant applications. Developers can obtain Qt 6.12 immediately through the Qt installer, the company website, or their Qt account dashboard.