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Image Resizer

Resize images online by changing width and height. Maintain aspect ratio or set custom dimensions. Perfect for web, email, and social media.

Supported formats: JPG, PNG, WebP, GIF

What is Image Resizer?

Image Resizer is a free online tool that changes the dimensions (width and height) of your images. Whether you need to scale down large photos for email attachments, resize images for social media profiles, or create thumbnails for websites, this tool handles it all in seconds. It supports JPG, PNG, WebP, and GIF formats and offers the option to maintain the original aspect ratio or set custom dimensions. All resizing happens entirely in your browser using the HTML5 Canvas API—no uploads, no servers, complete privacy. Perfect for web developers, designers, bloggers, and anyone who needs quick image dimension adjustments without installing software.

How to Use Image Resizer

  1. Upload Image: Click "Choose Image" and select an image file from your device.
  2. View Original: See your original image with its current dimensions (width x height in pixels).
  3. Enter New Dimensions: Type the desired width and/or height in pixels (1-5000px).
  4. Aspect Ratio: Check "Maintain aspect ratio" to prevent distortion. When enabled, entering one dimension automatically calculates the other.
  5. Resize: Click "Resize Image" to process your file with the new dimensions.
  6. Preview Result: View the resized image and confirm the new dimensions.
  7. Download: Click "Download Resized" to save the new image to your device.

Features

  • ✅ Resize images by width, height, or both
  • ✅ Maintain aspect ratio option (prevent distortion)
  • ✅ Support for JPG, PNG, WebP, GIF formats
  • ✅ Dimension range: 1px to 5000px
  • ✅ Real-time dimension display
  • ✅ 100% client-side processing (no uploads)
  • ✅ Instant resizing using Canvas API
  • ✅ One-click download of resized images

Use Cases

  • Social Media: Resize images to fit profile pictures, cover photos, or post requirements (Instagram, Facebook, Twitter, LinkedIn).
  • Website Optimization: Scale down images to reduce file size and improve page load speed.
  • Email Attachments: Reduce image dimensions to fit within email size limits and speed up sending.
  • Thumbnails: Create smaller preview images for galleries, blogs, or e-commerce product listings.
  • Print Preparation: Resize images to specific dimensions for printing or framing.

FAQ

What does "maintain aspect ratio" mean?
Aspect ratio is the proportional relationship between width and height. Maintaining it prevents distortion or stretching. When enabled, changing one dimension automatically adjusts the other to keep the image looking natural.
Does resizing reduce image quality?
Enlarging images (upscaling) can reduce quality and sharpness. Shrinking images (downscaling) generally preserves quality well. The tool uses high-quality Canvas resampling for best results.
Can I resize to very small dimensions?
Yes, you can resize from 1px to 5000px. For thumbnails, try 100-200px. For web images, 800-1200px width is common. For social media, check platform requirements.
Are my images uploaded to a server?
No. All resizing happens locally in your browser using JavaScript and Canvas API. Your images never leave your device.
Does resizing also compress the image?
Resizing changes dimensions, which often reduces file size. For additional compression without changing dimensions, use the Image Compressor tool.

Related Tools

Image Compressor Image Cropper Image to WebP PNG to JPG