Image Resizer & Crop
Free online browser-based image resizer and cropper. Adjust PNG, JPG, and WebP images to exact width and height specifications with maintain aspect ratio lock, DPI scaling, and multi-handle freeform cropping.
Resize an Image
Drag and drop an image here or click below to select an image.
Step-by-Step Instructions
Upload Source Image
Drag and drop or select your PNG, JPG, WebP, or SVG file into the image resizer.
Specify Dimensions or Percentage
Input exact target width and height in pixels (px), millimeters (mm), inches (in), or scale proportionally by percentage (e.g. 50%, 75%).
Configure Aspect Ratio & Resampling
Lock the aspect ratio constraint to prevent image distortion and choose your preferred bicubic interpolation filtering.
Download High-Quality Resized File
Export your resized image instantly in WebP, PNG, or JPEG format with optimized compression and zero quality loss.
Key Features & Capabilities
- High-fidelity bicubic and Lanczos resampling algorithms preserving crisp image edges and sharp typography during downscaling
- Aspect ratio lock preventing horizontal or vertical stretching across custom dimensions
- Flexible sizing units: resize by exact pixels, percentage scaling, or physical print measurements (inches/cm at 300 DPI)
- Social media preset dimensions: YouTube banners, Instagram posts (1080x1080), Facebook covers, and LinkedIn banners
- HTML5 Canvas client-side processing: resize massive 20MB+ RAW/PNG photos in milliseconds
- 100% private in-browser image processing: images are never uploaded to remote servers
Frequently Asked Questions
How does the image resizer prevent blurriness and pixelation when downscaling?
The resizer uses multi-step Lanczos / bicubic interpolation on an HTML5 2D Canvas context. Instead of simple nearest-neighbor sampling, it calculates a weighted average of neighboring pixels, preserving fine line details, sharp text, and smooth color transitions.
How do I maintain the correct aspect ratio while changing image width?
Keep the 'Lock Aspect Ratio' toggle enabled. When you enter a new width, the calculator automatically computes the proportional height using the formula `Height = (New Width / Original Width) * Original Height`, preventing image distortion.
Can I resize photos for official passport and visa application requirements?
Yes. You can switch units to inches or millimeters (e.g., 2x2 inches for US Passport photos or 35x45 mm for Schengen/UK visas) at 300 DPI (600x600 px or 413x531 px) to meet government submission criteria.
Are my personal photos stored, logged, or uploaded anywhere?
No. The entire image decoding, resampling, and encoding process executes purely in your browser's local memory using WebGL and Canvas APIs. No file data is ever transmitted over the network.
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