Image Tools
Image Resizer
Resize images online for free. Change image dimensions, compress photos, and optimize images for web and print. Fast image resizer.
Use Image Resizer to get instant results without uploads or sign-ups. Everything runs securely in your browser for fast, reliable output.
Your results will appear here.
About this tool
Our Image Resizer Calculator helps you plan image resizing operations by calculating new dimensions, aspect ratios, and estimated file sizes.
Resizing images is essential for web optimization, social media posts, email attachments, and print materials. Proper sizing improves load times and user experience.
This tool maintains aspect ratios, prevents distortion, and helps you choose optimal dimensions for your specific needs.
Usage examples
Resize for Web
Optimize a large photo for website
Input: 4000×3000 → 50% scale → Output: 2000×1500 (75% smaller file)
Social Media Resize
Resize for Instagram post
Input: 3000×2400 → Instagram preset → Output: 1080×1080 (square)
How to use
- Enter current image dimensions (width and height)
- Choose resize method (percentage, dimensions, or preset)
- Select output format and quality
- View new dimensions and estimated file size
Benefits
- Resize images to any dimension
- Maintain aspect ratio automatically
- Multiple resize methods available
- Social media presets included
- Calculate new file sizes
- Optimize for web and print
- Prevent image distortion
FAQs
Will resizing reduce image quality?
Reducing size (downscaling) generally maintains good quality. Increasing size (upscaling) may reduce quality and sharpness.
What is aspect ratio?
Aspect ratio is the proportional relationship between width and height (e.g., 16:9, 4:3). Maintaining it prevents distortion.
What size should I resize my images to?
For web: 1920px wide maximum. For social media: use platform-specific sizes. For email: 600-800px wide. For print: 300 DPI at final size.
Should I maintain aspect ratio when resizing?
Yes! Maintaining aspect ratio prevents stretching and distortion. Only use exact dimensions if you plan to crop or if distortion is acceptable for your use case.
What happens if I enlarge a small image?
Upscaling adds pixels but cannot add detail. Images become blurry or pixelated. Maximum 150-200% enlargement before quality degrades significantly.
How do I resize for retina displays?
Create images at 2x the display size (e.g., 2000px for 1000px display width). This ensures sharp display on high-DPI screens while maintaining reasonable file sizes.
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