Upscayl

Enlarges low-resolution images with AI while adding plausible details locally and offline. The #1 Free and Open Source AI Image Upscaler for Linux, MacOS and Windows. Upscayl uses the power of AI to upscale your images with the best quality possible. Upscayl runs on Windows, macOS, and Linux, making it cross-platform for desktop users. The desktop version is fully free and open-source with no hidden fees or subscriptions required. The core desktop app processes everything locally and works offline after installation. A Vulkan-compatible GPU (most modern NVIDIA or AMD cards) is required for practical performance; CPU-only or weak integrated graphics will be very slow or unsupported. It supports higher factors through double upscaling or chained processing, reaching up to 16x in some workflows. It delivers strong results for free, especially on privacy and basic upscaling, though paid options like Topaz Gigapixel AI often edge ahead on complex faces or generative features.