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Image Upscaler
Drag and drop an image here, or click to select
Supports JPG / PNG / WebP / GIF, high-quality Lanczos-3 interpolation upscale
AI mode uploads the image as multipart/form-data (fields image, scale) and receives the returned image binary. Example: POST endpoint, optional Authorization.
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Original size
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New size
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File size
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Upload an image, choose the algorithm and scale, then click "Upscale"
What is Image Upscaling?
Upscaling is a common image processing need, but ordinary scaling produces blur and pixelation. This tool uses Lanczos-3 separable-filter resampling by default, a well-regarded high-quality resampling method that preserves edge detail and minimizes aliasing, ideal for preparing small images for print, display or further editing.
Key Features
- Multiple scales: 2x, 3x, 4x presets plus custom scale.
- Lanczos interpolation: default high-quality Lanczos-3 resampling, sharper than bilinear/bicubic.
- Bicubic mode: progressive pyramid upscale, faster.
- AI upscale: optional external AI upscale API (multipart upload, Authorization supported).
- Output format: PNG (lossless), JPEG (adjustable quality), WebP.
- Preserve EXIF: keep image EXIF when possible.
- Local processing: default algorithm runs entirely in the browser for privacy.
How to Use
- Upload an image to enlarge (JPG / PNG / WebP / GIF).
- Choose an algorithm (Lanczos by default) and scale (2x / 3x / 4x / custom).
- Choose output format and JPEG quality, optionally preserve EXIF.
- Click "Upscale", preview the result and download the image.