Image Resizer Online
Resize images to exact dimensions for any use case—social media, websites, email, print, or any specific size requirement. This free online tool lets you scale images up or down while maintaining quality and offers both exact pixel dimensions and percentage-based scaling.
Understanding Image Resizing
Resizing changes the pixel dimensions of an image. Downscaling (making smaller) generally maintains quality well because existing pixels are sampled. Upscaling (making larger) can reduce quality because new pixels must be interpolated from existing ones. For best results, always start with the largest available original and resize down.
Social Media Image Sizes
| Platform | Post Type | Dimensions | Aspect Ratio | FacebookFeed post1200 x 6301.91:1 FacebookStory1080 x 19209:16 InstagramSquare1080 x 10801:1 InstagramPortrait1080 x 13504:5 InstagramLandscape1080 x 5661.91:1 InstagramStory/Reel1080 x 19209:16 Twitter/XIn-stream1200 x 67516:9 LinkedInPost1200 x 6271.91:1 PinterestPin1000 x 15002:3 YouTubeThumbnail1280 x 72016:9
Website Image Sizes
Use CaseRecommended WidthNotes Hero/Banner1920pxFull-width, above fold Blog content800-1200pxWithin article body Sidebar300-400pxSidebars, widgets Thumbnails300-400pxGalleries, cards Product images800-1200pxE-commerce detail Avatars100-200pxUser profiles OG images1200 x 630Social sharing
Retina/HiDPI Considerations
Modern devices have high pixel density displays (2x, 3x). To appear sharp:
Display Size@1x@2x (Retina)@3x 100px display100px200px300px 400px display400px800px1200px | 800px display | 800px | 1600px | 2400px |
Use CSS to display at intended size:
``css
img {
width: 400px;
height: auto;
}
``
Aspect Ratio Guide
| Ratio | Common Uses | Example Sizes | 1:1Instagram, avatars1080x1080, 500x500 4:3Traditional photos1200x900, 800x600 3:2DSLR photos1200x800, 900x600 16:9YouTube, HD video1920x1080, 1280x720 9:16Stories, vertical video1080x1920 | 2:3 | Pinterest pins | 1000x1500 |
Quality Preservation Tips
1. Always resize down, not up - Start with the largest original 2. Resize before compression - Reduces pixel count first, then compress 3. Maintain aspect ratio - Avoid stretching or squishing 4. Use appropriate algorithm - Lanczos for photos, nearest-neighbor for pixel art 5. Save in correct format - JPEG for photos, PNG for graphics
Use this resizer to prepare images for any platform or use case with precise dimension control.