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JPEG, PNG, WebP (max 32 MB). Resized in your browser; file is not uploaded.
What Can You Resize?
Our image resizer changes image dimensions to fit your needs, perfect for optimizing images for websites, social media, print, or any specific size requirements.
JPEG Resizing
Resize JPEG images with high-quality algorithms. Perfect for photos, web images, and social media posts. Maintains excellent visual quality even when scaling down significantly.
PNG Resizing
Resize PNG files while preserving transparency and sharp edges. Ideal for graphics, logos, icons, and images with text. Perfect for web graphics and UI elements.
WebP Support
Resize modern WebP images with high-quality results. WebP offers excellent compression and quality, making it perfect for web optimization after resizing.
Custom Dimensions
Set exact width and height in pixels for precise control. Perfect for creating thumbnails, banners, profile pictures, or any specific size requirement.
Aspect Ratio Control
Lock aspect ratio to maintain proportions automatically, or unlock for free resizing. Choose the option that best fits your needs - preserve proportions or create custom dimensions.
High-Quality Processing
Uses advanced Lanczos filtering and unsharp masking for professional-quality results. Resize images quickly in your browser with no quality loss from compression artifacts.
Privacy First
All resizing happens in your browser. Your files are never uploaded to any server. They're processed locally and remain completely private and secure.
How Image Resizing Works
Image resizing changes the pixel dimensions of an image while maintaining or adjusting its visual appearance. Our resizer uses advanced algorithms to ensure high-quality results.
When you resize an image, the resizer calculates new pixel values based on the original image data. For downscaling (making images smaller), it uses sophisticated filtering algorithms like Lanczos resampling to preserve detail and sharpness. For upscaling (making images larger), it interpolates new pixels intelligently to minimize blur and artifacts. The unsharp mask filter is applied to enhance edge definition and maintain crisp details after resizing.
Resizing Tips & Best Practices
Get the best results from resizing by understanding when and how to use it effectively.
When to resize
Resize images for websites, social media, email attachments, or print when you need specific dimensions. Large photos from cameras are often too big for web display and should be resized. Social media platforms have specific size requirements - resize images to match these dimensions for best results. For print, resize to match the required DPI and physical dimensions.
Maintaining aspect ratio
Keep the aspect ratio locked when resizing photos to avoid distortion. Changing aspect ratio significantly can make images look stretched or squashed. If you need a different aspect ratio, consider cropping first, then resizing. The lock aspect ratio feature automatically calculates the correct height when you change width (or vice versa) to maintain proportions.
Choosing dimensions
For web use, common sizes include 1920×1080 (Full HD), 1280×720 (HD), or smaller thumbnails like 300×300. Social media sizes vary: Instagram posts are typically 1080×1080 (square) or 1080×1350 (portrait), while Facebook covers are 820×312. Always resize down, not up - enlarging small images will reduce quality. If you need a larger image, start with a higher resolution source.
Format considerations
JPEG is best for photos and complex images. PNG is better for graphics, logos, or images with transparency. WebP offers excellent quality and compression but browser support varies. The resizer preserves your original format, so choose the right format before resizing based on your needs.
Privacy and security
This resizer runs entirely in your browser - your images never leave your device. No uploads, no server processing, no storage. Perfect for sensitive images or when you need to keep files private. All processing happens locally using advanced algorithms for professional-quality results.