Image Resizer
Resize your images to any dimensions.
Drop your image here
or click to browse · max 50 MB
Settings
Output: 0 x 0
wasm-vips (~5MB) will be downloaded on first use and cached by your browser.
Image Resizer
Resize images by percentage or exact pixel dimensions with optional aspect ratio locking. Supports all common image formats. Output in PNG, JPEG, WebP, or AVIF.
What is it used for?
- Resizing images for specific platform requirements
- Creating thumbnails and preview images
- Reducing image dimensions for web optimization
- Preparing images for print at specific dimensions
Step-by-Step Guide
- Upload your image
- Choose 'Percentage' or 'Dimensions' mode
- Set your target size
- Select output format (PNG, JPEG, WebP, AVIF)
- Click Convert and download
How it works
Upload an image, choose resize mode (percentage or dimensions), set your target size, and click Convert. wasm-vips uses high-quality Lanczos resampling for sharp results.
Tips & Best Practices
- Lock aspect ratio to prevent image distortion
- 50% reduction = 75% smaller file size (for both dimensions)
- Use WebP or AVIF output for the smallest files
Frequently Asked Questions
What resampling method is used?
wasm-vips uses Lanczos3 resampling by default, which produces sharp results with minimal artifacts.
Can I upscale images?
Yes, but upscaling beyond 200% will show visible blurriness since no new detail is created.
Will resizing reduce image quality?
Downscaling (making smaller) preserves quality well. Upscaling (making larger) can cause blurriness. For best results, always resize down from a larger original.
What dimensions should I use for social media?
Instagram: 1080x1080 (square), 1080x1350 (portrait). Facebook: 1200x630 (shared link). Twitter: 1200x675. YouTube thumbnail: 1280x720.
Privacy & Security
This tool uses wasm-vips (libvips compiled to WebAssembly). The WASM binary (~5MB) is downloaded on first use and cached by your browser. All image processing happens locally on your device - your images are never uploaded to any server. This makes it safe for sensitive, private, or confidential images.