Upscayl
Free and open-source AI image upscaler for Mac, Windows, and Linux that enhances photo resolution up to 16x using ESRGAN models entirely on-device.
Upscayl is a free and open-source AI image upscaling desktop application that runs ESRGAN-based super-resolution models locally on Mac, Windows, and Linux without sending images to any cloud service. Users drag in a low-resolution image and select a target scale factor - 2x, 4x, or up to 16x - and Upscayl processes the enhancement entirely on the local GPU, preserving privacy and working without an internet connection. The app supports multiple AI models including standard photo upscaling, digital art preservation, face enhancement, and noise reduction, giving users control over the algorithm appropriate for the source image type. With over 20,000 stars on GitHub and active community maintenance, Upscayl is one of the most widely used open-source image enhancement tools available. It is completely free with no paid tier.
Key Features
- On-device AI upscaling up to 16x using ESRGAN models without uploading images to any external server
- Multiple model selection - standard photo, digital art, face enhancement, and noise reduction models for different source types
- Batch processing for upscaling entire folders of images in one operation with consistent settings applied across all files
- Output format selection with PNG, JPEG, and WebP export options and configurable compression quality
- GPU acceleration on Apple Silicon, NVIDIA CUDA, and AMD GPUs for fast processing without cloud dependency
- Custom model import allowing users to drop in community-trained ESRGAN models for specialized enhancement tasks
Use Cases
- Photographers enhancing low-resolution scans of old film prints or archival photos without quality loss from cloud processing
- Game developers and digital artists upscaling concept art, texture sprites, and reference images for high-resolution production use
- Designers preparing web-sourced images for print production where the original source resolution is insufficient
- Privacy-conscious users who need image enhancement without uploading personal photos to web-based processing services
Pros
- Completely free with no paid tier - zero cost for any volume of images regardless of resolution or output size
- Fully on-device processing means no privacy exposure and no internet requirement - works in air-gapped environments
- Custom model import gives power users access to the latest community-trained ESRGAN variants beyond the built-in defaults
Cons
- Desktop app only - no API, web interface, or batch cloud pipeline for teams processing images at enterprise scale
- Processing speed on CPU-only machines is very slow - meaningful GPU hardware is required for practical batch use
- Output quality on photographic images with complex textures occasionally introduces AI artifacts that require manual inspection
Upscayl Alternatives
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LetsEnhance
AI image upscaling tool that enlarges photos up to 16x without quality loss - restores faces, sharpens textures, and removes JPEG artifacts in one click.
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