Resize images quickly and easily - all processing happens in your browser
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Click to upload an image
Supports: JPG, PNG, GIF, WebP
Image resizing is the process of changing the pixel dimensions of a photo or graphic. Whether you need to resize image online for your website, reduce image size for faster loading, or optimize photos for social media, proper image resizing is essential for web performance.
Images account for ~50% of the average web page's total size. A 1-second delay in load time can reduce conversions by 7%. Using a photo resizer to optimize your images isn't optionalβit's critical for user experience and SEO rankings.
Example: Displaying a 4000px-wide image at 800px width wastes 80% of data. Use an image optimizer to resize to 1600px (2x for retina), and cut file size by 75%.
Aspect ratio is the proportional relationship between an image's width and height. Common aspect ratios include 16:9 (widescreen), 4:3 (traditional), 1:1 (square), and 9:16 (portrait/stories).
When you resize photos free of distortion, maintaining aspect ratio is crucial. Forcing a 16:9 image into a 1:1 square without cropping will stretch or squash the image. Our image resizer includes an aspect ratio lock to prevent this automatically.
| Platform | Type | Dimensions | Ratio |
|---|---|---|---|
| Post | 1200 Γ 630 px | 1.91:1 | |
| Square | 1080 Γ 1080 px | 1:1 | |
| Story | 1080 Γ 1920 px | 9:16 | |
| Twitter/X | Post | 1200 Γ 675 px | 16:9 |
| Post | 1200 Γ 627 px | 1.91:1 | |
| YouTube | Thumbnail | 1280 Γ 720 px | 16:9 |
Keep email images under 1000px width and under 200KB for fast rendering. Email clients may block or slow-load larger images.
| Format | Best For | Transparency | File Size |
|---|---|---|---|
| JPEG | Photos, realistic images | β No | Small |
| PNG | Graphics, logos, screenshots | β Yes | Large |
| WebP | All web images (modern) | β Yes | 25-35% smaller |
Pro tip: Use WebP for modern browsers (25-35% smaller than JPEG). Fall back to JPEG for maximum compatibility. Use PNG only when you need transparency.
When you use an image optimizer to reduce image size, you're balancing file size against visual quality:
Scaling down: Minimal quality loss if done correctly. Scaling up: Always reduces quality (pixelation). Always start with high-resolution originals.
Resizing changes pixel dimensions (e.g., 1000Γ1000 β 500Γ500). Compressing reduces file size by removing data (8MB β 200KB). For best results, do both.
Yes, when scaling down. When scaling up, quality will always degrade. Use our photo resizer with high-resolution source images for best results.
WebP is the best modern format (smaller files, good quality). Use JPEG as a fallback. Our image resizer supports all major formats.
Use our free online image resizer above! It's 100% browser-based, meaning your images never leave your device. Resize photos free with no watermarks, no sign-ups, and no limits.
Optimized images load faster, improve SEO rankings, reduce bandwidth costs, and provide a better user experience. Our image optimizer helps you reduce image size while maintaining quality.