Increase image resolution with high-quality upscaling. Choose 2x, 3x, or 4x enlargement with multiple methods. 100% in-browser — nothing is uploaded.
Freeno limits, no sign-up
Up to 4xscale factor
100%private — runs in browser
🔬
Drop images here to upscale
or click to browse · JPG, PNG, WebP · Multiple files for batch mode
Original
--
➔
Upscaled
--
Multi-pass smooth scaling: steps up 2x at a time for superior quality on photographs.
Before / After Comparison
OriginalUpscaled
Original
Upscaled
How to Upscale an Image Online
Upload your image, select a scale factor (2x, 3x, or 4x), choose an upscaling method, and click Upscale. The tool processes everything locally in your browser using the HTML5 Canvas API. For photographs, the Smooth multi-pass method produces the best results by gradually stepping up the resolution. For pixel art or retro graphics, Nearest Neighbor preserves the crisp pixel edges.
Upscaling Methods Explained
Smooth (Multi-Pass) scales the image up 2x at a time in multiple steps until reaching the target resolution. Each step uses high-quality bicubic-like interpolation, producing significantly better results than a single large jump. This is the recommended method for photographs and natural images.
Bilinear Interpolation uses the browser's built-in image smoothing to scale directly to the target size in one step. It produces good results for moderate upscaling and is the fastest method.
Nearest Neighbor duplicates each pixel without any smoothing or blending. This preserves the sharp, blocky appearance of pixel art, icons, and retro game sprites. It is not recommended for photographs as it creates a jagged, pixelated look.
Tips for Best Results
Start with the highest quality source image available. Upscaling cannot add detail that was not in the original, so a higher starting resolution will always yield better results. For photographs, the Smooth method at 2x produces excellent results. Going to 4x works well for small images but may show softness on already large photos. For screenshots and text, Bilinear at 2x is usually sufficient.
Frequently Asked Questions
How does image upscaling work? ▶
Image upscaling increases the dimensions of an image by creating new pixels between existing ones. This tool uses canvas-based methods including multi-pass smooth scaling (steps up 2x at a time), bilinear interpolation, and nearest neighbor. Each method uses different algorithms to determine the color of new pixels.
Will upscaling make my image look better? ▶
Upscaling increases the pixel count but cannot create new detail that was not in the original image. However, the Smooth multi-pass method does an excellent job of preserving clarity when enlarging. Results depend on your source image quality and the scale factor you choose. Smaller scale factors (2x) generally produce the best looking results.
What is the best method for pixel art? ▶
Use the Nearest Neighbor method for pixel art. It scales each pixel into a larger block without any blending or smoothing, perfectly preserving the sharp, blocky aesthetic that defines pixel art. Bilinear and Smooth methods will blur the edges between pixels, which is undesirable for pixel art.
Is there a size limit? ▶
There is no strict file size limit since all processing happens on your device. However, browsers have canvas size limits (typically around 16384 pixels per dimension). Very large images at 4x may exceed browser memory. We recommend keeping the output resolution under 8000x8000 pixels for reliable results across all browsers.
What resolution can I upscale to? ▶
You can upscale images to 2x, 3x, or 4x their original resolution. For example, a 640x480 image at 4x becomes 2560x1920. The tool displays both the original and target dimensions before processing so you can verify the output size.