Image Resizer
Change image dimensions quickly and accurately by pixel or percentage.
Drop your image here
Drag & drop single photo for Studio Mode, or multiple photos for 1-Click Batch Processing
Your images stay on your device
Processing happens 100% locally in your browser. Files are never uploaded to any cloud server.
How to use this tool
Upload Image
Select the photo you wish to resize.
Enter Dimensions
Specify target width/height in pixels or select a percentage scale preset.
Save Resized Image
Click Download to export your perfectly scaled image.
Why use Image Toolkit?
Aspect Ratio Lock
Maintains natural proportions to prevent image stretching or distortion.
Social Media Presets
One-click dimensions for Instagram, YouTube, Facebook, Twitter, and Web banners.
Bicubic Interpolation
High quality smooth canvas sampling ensures crisp downscaled and upscaled results.
How Image Resizer Works in Your Browser
Unlike conventional online conversion websites that upload your files to remote cloud servers, Lumino processes your media 100% client-side inside your browser sandbox using modern WebAssembly (WASM), WebGPU, and the HTML5 Canvas 2D API.
This means your sensitive photos, identity cards, passport scans, and proprietary design files are processed directly on your local device hardware (RAM/GPU) and are never transmitted across the internet.
Everything You Need to Know
Clear answers on privacy, security, file limits, and image quality.
Related Image Tools
Image Compressor
Reduce image file size with lossless quality, exact KB target mode, and multi-file batch ZIP download.
Image Cropper
Crop photos to custom dimensions or standard aspect ratios (1:1, 16:9, 4:3, 9:16).
Image Dimension Checker
Inspect exact image width, height, aspect ratio, megapixels, and print DPI sizes.
Aspect Ratio Calculator
Calculate exact simplified aspect ratios and find target scaling dimensions.