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When you upload an image, the script redraws it at a higher resolution using different scaling strategies (fast, balanced, or high quality) without sending your image to any server.
You can upscale images up to 8× (800%). The available options are:
No. All image processing happens locally in your browser using JavaScript and Canvas. Your images are not uploaded, stored, or transmitted anywhere, which also means the speed depends on your device performance.
Batch Mode allows you to upscale multiple images at once.
According to the code:
You can upload up to 3 images at a time
Each image must be under 50 MB
Images are processed one by one in sequence
Each result can be downloaded individually as a PNG, JPG and WEBP.
Fast: Single-step scaling with lower smoothing (fastest, lowest quality)
Balanced: Multi-step scaling with moderate smoothing
High Quality: Multi-step scaling with high smoothing and optional sharpening for larger scales (slowest but best quality)