About Image Resizer
The Image Resizer is a free online tool that lets you resize images to custom dimensions or preset sizes. Perfect for social media, web optimization, and more. All processing happens locally in your browser.
Features
- Custom width and height controls
- Aspect ratio lock/unlock
- Quality adjustment (10% - 100%)
- 13+ preset sizes for social media, video, and web
- Real-time preview
- Instant download as JPEG
- 100% client-side processing
Preset Sizes
Choose from popular preset sizes including Instagram posts and stories, Facebook, Twitter, YouTube thumbnails, HD/4K video, and web banners.
How to Use
- Click "Choose Image" to upload an image
- Enter custom dimensions or select a preset size
- Toggle aspect ratio lock to maintain proportions
- Adjust quality slider if needed
- Click "Resize Image" to process
- Download your resized image
Use Cases
- Social media posts (Instagram, Facebook, Twitter)
- Website optimization and faster loading
- Email attachments (reduce file size)
- Profile pictures and avatars
- Thumbnails and previews
- Print preparation
Privacy & Security
All image processing happens locally in your browser using HTML5 Canvas. Your images are never uploaded to any server, ensuring complete privacy and security.
Tips
- Lock aspect ratio to avoid distortion
- Use preset sizes for social media posts
- Lower quality for smaller file sizes
- Keep quality at 90% for best results
- Resize before uploading to save bandwidth