Drop your image here
or click to browse from your device
Scale images up or down to precise pixel dimensions.
Drop your image here
or click to browse from your device
Displaying an unscaled 4000-pixel photo inside a 600-pixel mobile column degrades rendering performance and wastes user bandwidth. ImageUp's client-side image resizer gives you pixel-accurate dimension control, automatic aspect ratio preservation, and high-quality bilinear interpolation directly on your device.
Drop your JPEG, PNG, or WebP photo to read its native dimensions.
Enter your target width or height in pixels. Toggle Aspect Ratio Lock to prevent distortion.
Click resize to scale the canvas buffer and instantly download your resized asset.
Applies anti-aliasing interpolation filters to ensure downscaled images remain crisp without jagged edge artifacts.
Automatically calculates matching height when width is changed (and vice versa) to prevent accidental stretching or squishing.
Scaling is performed in local browser memory via HTML5 Canvas. Your photos never leave your device.
Resizing changes the physical pixel dimensions of an image (e.g. from 3000×2000px down to 1200×800px). Compressing reduces the file weight (kilobytes) by optimizing color data without necessarily changing the pixel dimensions.
Downscaling photos always preserves sharpness. Enlarging an image beyond its native resolution can cause softening or pixelation, as new pixel data must be interpolated.
For full-width desktop hero banners, 1920×1080px or 1600×900px is the recommended standard for sharp rendering on 1080p and Retina displays.
Yes, resized outputs are encoded using optimal image smoothing and balanced quality to keep file sizes compact while maintaining sharpness.
Unscaled photos are a leading cause of slow pages. This tool scales images to exact pixel dimensions, whether you're shrinking a camera RAW for an email banner or preparing product shots for a storefront, so graphics fit the space they're meant for.
Quality holds up through the shrink: high-quality anti-aliasing keeps edges clean, and locking the aspect ratio prevents distortion, with the height adjusting automatically when you set a width.
Scaling happens locally with HTML5 Canvas, so files stay on your device, process instantly, and cost nothing, which makes optimizing a whole media library practical.
Related reading: batch resizing images securely.