image resizer online
Resize images to specific dimensions or scale by percentage.
An image resizer allows you to change image dimensions to meet specific requirements for websites, social media, documents, or printing. This tool is essential for web developers, graphic designers, social media managers, and anyone who needs to adjust image sizes for different platforms or purposes. By resizing images, you can ensure they fit layout requirements, meet platform specifications, reduce file sizes, and maintain proper proportions. The tool processes images entirely in your browser, providing instant results without uploading files to external servers.
What is image resizer online?
Image resizing is the process of changing an image's dimensions (width and height) while maintaining or adjusting its aspect ratio. This online image resizer uses HTML5 Canvas technology to process images client-side, meaning all operations happen in your browser without server uploads. You can resize images by specifying exact pixel dimensions or by percentage scaling. The tool offers an option to maintain aspect ratio, which preserves the original width-to-height proportion and prevents distortion. When aspect ratio is disabled, images can be stretched or compressed to exact dimensions.
Common use cases
- Social media optimization: Resize images to meet platform requirements (Instagram, Facebook, Twitter profile and post dimensions)
- Website development: Adjust image sizes to fit website layouts and responsive design requirements
- Email signatures: Resize profile photos or logos to appropriate sizes for email signatures
- Document preparation: Scale images to fit within document margins and page layouts
- Thumbnail creation: Generate smaller thumbnail versions of images for galleries or previews
- Print preparation: Resize images to specific print dimensions and DPI requirements
Limitations and common mistakes
- Upscaling images (making them larger) may result in pixelation or blurriness, as the tool cannot add detail that was not in the original
- Resizing without maintaining aspect ratio can cause distortion, making subjects appear stretched or compressed
- Very large images may take longer to process, and browser memory limits may restrict maximum file sizes
- The tool maintains the original image format but does not optimize file size like dedicated compression tools
- Resizing may slightly reduce image quality due to interpolation algorithms used during the resizing process
How to use this image resizer
- Click "Select image to resize" and choose an image file from your device
- Choose resize mode: Pixels (exact dimensions) or Percentage (scale by percentage)
- If using pixels, enter desired width and height, and optionally enable "Maintain aspect ratio"
- If using percentage, adjust the percentage slider to scale the image proportionally
- Click "Resize Image" to process and preview the resized result
- Download the resized image using the download button
Frequently Asked Questions
How does image resizing work?
The resizing happens entirely in your browser using HTML5 Canvas technology. Your images are never uploaded to any server. You can resize by specifying exact pixel dimensions or by percentage scaling.
What is aspect ratio and why should I maintain it?
Aspect ratio is the proportional relationship between width and height. Maintaining it prevents distortion and keeps the image looking natural. If unchecked, the image may be stretched or compressed, causing subjects to appear distorted.
What image formats are supported?
The tool supports all common image formats including JPEG, PNG, GIF, and WebP. The output format matches the input format, preserving the original file type.
Can I make images larger without losing quality?
Upscaling images will result in some quality loss or pixelation, as the tool cannot create detail that was not in the original image. For best results, start with high-resolution source images.
What is the difference between pixel and percentage resizing?
Pixel resizing sets exact width and height dimensions, while percentage resizing scales the image proportionally by a percentage factor. Percentage mode always maintains aspect ratio.
Is my image data secure?
Yes, all processing happens in your browser. Images are never uploaded to any server, ensuring complete privacy and security of your files.