Image Resizer

What this tool does

Image Resizer changes the pixel dimensions of your images to exact sizes you specify. Whether you need images at specific dimensions for a website, social media platform, or print project, this tool scales your images while maintaining quality. You can resize by entering exact pixel dimensions or by scaling as a percentage of the original size.

The resizer preserves aspect ratio by default, preventing stretched or squashed images. When you change width, height adjusts proportionally, and vice versa. This ensures your images look natural regardless of how dramatically you resize them.

How to use this tool

1. Upload an image file or paste a URL to an image hosted online.

2. View the current dimensions displayed automatically after upload.

3. Enter new width and height in pixels, or use the percentage slider to scale proportionally.

4. Select output format (JPG, PNG, WebP) based on your needs.

5. Click resize and download the processed image.

Common use cases

• Resize photos to fit website content area requirements
• Create thumbnail versions of product images
• Prepare images for social media platforms with specific dimension requirements
• Reduce image dimensions to decrease file size for email
• Enlarge small images for presentation slides
• Standardize image sizes across a photo collection
• Create different size versions for responsive web design
• Adjust images for print at specific physical dimensions

Key features and behavior

Aspect ratio preservation

The tool links width and height by default. When you change one dimension, the other adjusts automatically to maintain the original proportions. This prevents distortion where images appear stretched or compressed. You can override this behavior if you specifically need non-proportional resizing.

Percentage scaling

The percentage slider provides quick scaling without calculating exact dimensions. Scale to 50% for half-size, 200% for double-size, or any value between 1% and 500%. This is particularly useful when you need consistent relative sizing across multiple images.

Enlargement quality

Making images larger than their original dimensions requires interpolation—the tool creates new pixels by analyzing surrounding colors. Results look best when enlarging by small amounts (up to 150-200%). Extreme enlargement produces increasingly soft or pixelated results since no new detail can be created from a smaller source.

Output format selection

Choose your output format based on intended use. JPEG works best for photographs with millions of colors. PNG preserves sharp edges and supports transparency for graphics. WebP offers smaller files than both for web use but requires browser support verification.

Tips and limitations

• Downscaling (making smaller) always produces good results
• Upscaling beyond 200% of original size degrades quality noticeably
• For print, calculate needed pixels from physical size × DPI (e.g., 8×10 inches at 300 DPI = 2400×3000 pixels)
• JPEG resaving accumulates quality loss; minimize re-exports when possible
• Very large images (over 10000px) may take longer to process
• Original file is never modified; a new resized copy is created

FAQ

Can I make a small image larger without losing quality?

Moderate enlargement (up to 150-200%) produces acceptable results with modern scaling algorithms. However, true detail cannot be created from a smaller source. For significant enlargements, AI upscaling tools exist but may introduce artifacts.

What dimensions should I use for social media?

Requirements vary by platform: Instagram posts work well at 1080×1080 (square) or 1080×1350 (portrait). Facebook shared images display best at 1200×630. Twitter images suit 1600×900. Check current platform guidelines as these change periodically.

Why does my resized image look blurry?

Blurriness occurs when enlarging images beyond their original resolution, or when a lossy format (JPEG) is resaved multiple times. For sharpest results, resize from the original file and avoid unnecessary format conversions.

How do I maintain the exact aspect ratio?

Keep the aspect ratio lock enabled (default). Enter either width or height, and the tool calculates the other dimension automatically. This prevents accidental stretching or squashing.

What's the maximum file size I can upload?

The upload limit is typically 10-20MB, sufficient for most high-resolution photographs. If your file exceeds this, compress it first or use image editing software for very large files.

Does resizing affect image metadata?

Resizing may strip or preserve metadata depending on the tool and format. If preserving EXIF data matters (camera settings, GPS), check the output file or use specialized software that explicitly maintains metadata.

Can I resize multiple images at once?

This tool processes one image at a time. For batch resizing, consider using the Image Compressor tool which supports multiple files, or desktop software for large batches.

What's the difference between resizing and cropping?

Resizing changes the entire image's dimensions while keeping all content visible. Cropping removes portions of the image to focus on a specific area. Use the Image Cropper tool if you need to cut out parts of your image.