Image Resizer
Image resizing changes dimensions (width and height) while maintaining aspect ratio by default. Resize modes: Fit (shrink to bounds, preserving ratio), Fill (crop to exact dimensions), Stretch (ignore ratio). Common sizes: thumbnails (150x150px), social media (1200x630px for OpenGraph), profile pics (400x400px). Formula for aspect ratio: new_height = (original_height / original_width) × new_width. Higher resolution (300+ DPI) for print; 72 DPI sufficient for web. Resize before upload to reduce bandwidth and improve page speed. Export formats: JPEG (photos, lossy), PNG (transparency, lossless), WebP (modern, 25-35% smaller). Client-side resizing uses HTML Canvas API - no uploads needed.
Resize images online with custom dimensions or presets. Support for HD, Full HD, 4K, Instagram, Twitter, Facebook sizes. Choose output format (JPEG, PNG, WebP) and quality. Maintain aspect ratio or set custom width and height. Perfect for social media, web optimization, and image editing.
Upload Image
Drop image here or click to upload
Supports JPG, PNG, WebP, GIF
How to Use
- Enter your value in the input field
- Click the Calculate/Convert button
- Copy the result to your clipboard
Frequently Asked Questions
- How do I resize an image without losing quality?
- To minimize quality loss, only downsize (make smaller), never upsize. Use lossless formats like PNG for graphics and logos. For photos, use high-quality JPEG (90-95% quality) or WebP. Maintain aspect ratio to avoid distortion. When downsizing, use bicubic or lanczos resampling algorithms (automatic in most tools). For significant size reductions (e.g., 4000px to 500px), resize in steps rather than all at once for better results.
- What are the recommended image sizes for social media?
- Recommended sizes: Instagram post (1080×1080px square, 1080×1350px portrait), Instagram story (1080×1920px), Facebook post (1200×630px), Twitter post (1200×675px), LinkedIn post (1200×627px), YouTube thumbnail (1280×720px), profile pictures (400×400px to 800×800px). Use exact dimensions for best display. Social platforms compress uploads, so start with high-quality originals and let the platform optimize.
- What is the difference between resizing and compressing images?
- Resizing changes dimensions (width and height in pixels), affecting file size indirectly. Compressing reduces file size by lowering quality or using better encoding, without changing dimensions. For example, a 2000×2000px image can be resized to 500×500px (fewer pixels) or compressed from 2MB to 200KB (same dimensions, lower quality). Both techniques reduce file size; combine them for optimal web performance.
- Should I use JPEG, PNG, or WebP for resized images?
- Use JPEG for photographs and images with many colors (smaller file size, lossy compression). Use PNG for graphics, logos, text, screenshots, or images requiring transparency (larger file size, lossless). Use WebP for best compression — 25-35% smaller than JPEG/PNG with similar quality, but older browsers may not support it. For web use, provide WebP with JPEG fallback. Avoid GIF unless you need animation.
- What does "maintain aspect ratio" mean?
- Aspect ratio is the proportional relationship between width and height (e.g., 16:9, 4:3, 1:1). Maintaining aspect ratio preserves these proportions when resizing, preventing distortion. For example, a 1600×1200px image (4:3 ratio) resized to 800px wide becomes 800×600px. If you force it to 800×400px without maintaining ratio, the image will appear stretched or squished. Most image resizers maintain aspect ratio by default.
- How do I resize images in bulk?
- Use batch processing tools: desktop software like IrfanView (Windows), XnConvert (cross-platform), or Adobe Photoshop actions. Online tools like Squoosh, TinyPNG, or Bulk Resize Photos handle multiple images. Command-line tools: ImageMagick (convert) or ffmpeg for automation. For web development, integrate image optimization into build pipelines using tools like Sharp (Node.js) or Pillow (Python) to automatically resize uploads.
- What is DPI and does it matter for web images?
- DPI (dots per inch) or PPI (pixels per inch) measures print resolution. For web images, DPI is irrelevant — only pixel dimensions matter. Web images are typically 72 DPI by convention, but a 1000×1000px image displays identically whether it is 72 DPI or 300 DPI on screen. For print, use 300 DPI. When resizing for web, focus on pixel dimensions (e.g., 1920×1080px) and ignore DPI settings.
- How small should I resize images for website performance?
- Resize images to their display size, not larger. For hero images (full-width banners), 1920-2560px wide is sufficient. For thumbnails, 300-500px. For blog post images, 800-1200px wide. Serve responsive images using srcset to provide multiple sizes for different devices. Aim for file sizes under 200KB per image. Total page size should be under 1-3MB including all images. Compress after resizing for maximum performance.