Image Resizer
Resize any image to exact pixel dimensions with an optional aspect-ratio lock. Scale photos smoothly in your browser with zero uploads.
How to use Image Resizer
- 1Upload your image file (PNG, JPG, WebP, GIF, or BMP) via the file picker or drag-and-drop zone.
- 2Enter your target width or height in pixels; leave the aspect ratio lock enabled to scale proportionally without distortion.
- 3Click Resize to render the new dimensions onto a high-resolution canvas in local memory.
- 4Review the output preview showing exact final dimensions and click Download to save the resized image.
Key features
Pixel-Precise Dimension Control
Specify exact pixel width and height targets to meet banner, thumbnail, and responsive web layout specifications.
Proportional Aspect Ratio Lock
Lock the original width-to-height ratio so adjusting width automatically updates height, eliminating distortion and stretching.
Lossless PNG Output Encoding
Exports the scaled image directly as high-fidelity PNG to preserve transparency and sharp edge definition.
100% Client-Side Canvas Scaling
Images are decoded and rescaled entirely in local browser memory via HTML5 Canvas with 0 bytes transmitted over the network.
Examples & use cases
Downscaling 4K Photo to Full HD
Proportionally scale high-resolution 4K photography down to 1080p for web presentation.
Original: 3840 × 2160 px (16:9 ratio), Target Width: 1920 px, Aspect Ratio: Locked
Resized: 1920 × 1080 px (16:9 preserved, sharp bilinear downsampling, PNG output)
Exact E-commerce Product Square
Scale an image non-proportionally to match an exact square product card slot.
Original: 1600 × 1200 px (4:3 ratio), Target: 800 × 800 px, Aspect Ratio: Unlocked
Resized: 800 × 800 px (scaled non-proportionally to match exact square slot)
Website Header Thumbnail
Create an exact half-scale social preview thumbnail.
Original: 1200 × 630 px (OG image), Target Width: 600 px, Aspect Ratio: Locked
Resized: 600 × 315 px (proportional 50% scale, exact half-size dimensions)
Frequently asked questions
Helpful guides & tutorials
Related tools
Crop an image to a custom or preset aspect ratio.
Reduce image file size while controlling quality and output format.
Convert an image to a specific aspect ratio by cropping or padding.
Resize and crop photos to official passport and visa sizes at 300 DPI.
Preview real output file sizes across PNG, JPEG, and WebP quality levels.