📐 Image Resizer Guide

What is Image Resizing?

Image resizing changes the dimensions (width and height) of your images. Our tool lets you resize JPG, PNG, and JPEG images using custom dimensions, social media presets, or percentage scaling. Perfect for optimizing images for websites, social media, printing, or storage.

How to Resize Images

• Step 1: Upload images (single or multiple files)
• Step 2: Choose resize method (Custom, Social Media, or Percentage)
• Step 3: Enter dimensions or select preset
• Step 4: Toggle aspect ratio lock if needed
• Step 5: Adjust output quality (10-100%)
• Step 6: Click "Resize All Images"
• Step 7: Download resized images

Key Features

• Custom Dimensions: Set exact width and height in pixels
• Aspect Ratio Lock: Maintain original proportions automatically
• Social Media Presets: One-click resize for Instagram, Facebook, Twitter, YouTube
• Percentage Scaling: Resize by percentage (50% = half size)
• Batch Resize: Process multiple images at once
• Quality Control: Adjust output quality (10-100%)
• Before/After Preview: See original and resized dimensions
• Individual Download: Download each resized image
• Bulk Download: Download all at once
• Format Support: JPG, JPEG, PNG
• Browser-Based: No upload to servers
• 100% Free: No limits, no watermarks

Resize Methods

• Custom Size: Enter exact width and height in pixels with aspect ratio lock option
• Social Media Presets: Pre-configured sizes for popular platforms
• Percentage Scaling: Scale images by percentage (maintains aspect ratio)

Social Media Image Sizes

• Instagram Post: 1080 x 1080 px (square)
• Instagram Story: 1080 x 1920 px (9:16 ratio)
• Facebook Post: 1200 x 630 px (recommended)
• Twitter Post: 1200 x 675 px (16:9 ratio)
• YouTube Thumbnail: 1920 x 1080 px (Full HD)
• LinkedIn Banner: 1584 x 396 px
• Twitter Header: 1500 x 500 px
• Standard Web: 800 x 600 px (general use)

Common Use Cases

• Social Media: Resize images for perfect platform fit
• Website Optimization: Create web-optimized image sizes
• Email Attachments: Reduce image dimensions for email
• Profile Pictures: Create square profile images
• Thumbnails: Generate smaller thumbnail versions
• Printing: Resize for specific print dimensions
• Product Photos: Standardize e-commerce image sizes
• Portfolio: Create consistent image dimensions

Aspect Ratio Lock Explained

• Locked (🔒): Maintains original proportions - changing width auto-adjusts height
• Unlocked (🔓): Independent width/height control - may distort image
• Recommendation: Keep locked to prevent image distortion

Quality Settings

• Low (10-40%): Smallest file size, lower quality
• Medium (50-70%): Balanced size and quality
• High (80-90%): Excellent quality, recommended
• Maximum (95-100%): Best quality, larger files

Why Resize Images?

• Platform Requirements: Meet social media size specifications
• Faster Loading: Smaller dimensions = faster page loads
• Storage Savings: Reduce file size and storage usage
• Better Performance: Optimize for web and mobile
• Professional Look: Consistent sizes look more polished
• Bandwidth Savings: Use less data for uploads/downloads

Best Practices

• Keep aspect ratio locked: Prevents image distortion
• Don't upscale too much: Enlarging images reduces quality
• Use presets for social: Guaranteed perfect fit
• Save originals: Keep original files before resizing
• Consider final use: Web needs smaller sizes than print
• Test different qualities: Find balance between size and quality

Privacy & Security

All image resizing happens directly in your browser using JavaScript Canvas API. Your images are never uploaded to any server, ensuring complete privacy and security. The resizing process is instant and your files remain on your device at all times.

Technical Details

Our image resizer uses HTML5 Canvas API for client-side image processing. Images are scaled using high-quality bicubic interpolation for smooth results. Aspect ratio calculations maintain proportions when locked. The tool supports all modern browsers and handles large images efficiently.