Resize Images Online β Free Image Resizer
Drag and drop your image here or click to select
Max size: 50.0MB
Supported Formats
What Is Image Resizing?
Image resizing changes the pixel dimensions of an image β making it larger or smaller to fit specific requirements. Common use cases include preparing images for websites (optimizing load time), social media (matching platform dimensions), print (ensuring sufficient DPI), and thumbnails. Convertilo performs resizing entirely in your browser using the Canvas API with high-quality Lanczos resampling. You can resize by exact pixel dimensions, percentage, or predefined presets for popular platforms. The original aspect ratio can be locked or freely adjusted.
Image Format Comparison
Each image format has unique strengths. Choose the right format based on your needs:
| Format | Best For | Transparency | Animation | Compression | Browser Support |
|---|---|---|---|---|---|
| JPEG | Photographs, complex images | No | No | Lossy (up to 53%) | Universal |
| PNG | Graphics, screenshots, logos | Yes | No | Lossless/Lossy (up to 75%) | Universal |
| WebP | Web images, all-purpose | Yes | Yes | Both lossy and lossless | 95%+ browsers |
| AVIF | Maximum compression, modern web | Yes | Yes | Best ratio (up to 59%) | 90%+ browsers |
| GIF | Simple animations, memes | Limited (1-bit) | Yes | Lossy (up to 75%) | Universal |
| SVG | Icons, logos, vector graphics | Yes | CSS/JS | XML optimization (42%) | Universal |
About Image Resizing
Image resizing allows you to change image dimensions for different purposes: web optimization, social media, printing. Our tool supports all popular formats with quality preservation.
Resizing Algorithms
- High-quality bicubic interpolation for smooth scaling
- Aspect ratio preservation with intelligent cropping
- Format-specific optimization for best results
- Anti-aliasing for sharp edges and text
Benefits of Our Resize Service
Universal Format Support
Support for all popular image formats including JPG, PNG, WebP, AVIF, and HEIC with format-specific optimizations.
Social Media Presets
Ready-made dimensions for Instagram, Facebook, YouTube, Twitter and other platforms. Perfect for content creators.
Quality Preservation
High-quality algorithms maintain image sharpness and detail during resizing process with minimal quality loss.
Frequently Asked Questions About Resizing
Is quality preserved when resizing images?
Yes, we use advanced algorithms to maintain image sharpness and quality. Upscaling may slightly reduce quality, but downscaling preserves detail excellently.
What image formats can be resized?
Our resizer supports JPG, PNG, WebP, AVIF, HEIC and other popular formats. Each format maintains its specific features during resizing.
Are social media presets available?
Yes, we provide ready-made dimensions for Instagram, Facebook, YouTube, Twitter and other platforms. Perfect for content creators and social media managers.
Can I resize multiple images at once?
Currently our service processes one image at a time to ensure maximum quality and control over each image's settings and output.
How do I maintain aspect ratio when resizing?
Our resizer automatically maintains aspect ratio by default. You can also choose specific aspect ratios or manually set custom dimensions if needed.
What social media presets are available?
We offer presets for Instagram posts (1080x1080), stories (1080x1920), Facebook cover (1200x630), YouTube thumbnails (1280x720) and many more popular sizes.