Image Compressor
The Image Compressor tool reduces file sizes of JPEG, PNG, and WebP images while maintaining high quality. Features include quality adjustment (10-100%), resizing options, and mockup creation for iPhone, Android, and PC. All processing happens in your browser, so your images are never sent to any server.
What You Can Do
The Image Compressor compresses image files while maintaining high quality, dramatically improving webpage loading speed. Optimize Core Web Vitals key metrics like LCP (Largest Contentful Paint) and boost PageSpeed Insights scores. All processing happens in your browser, so images are never sent externally.
- ✅ High-Quality Compression: Supports JPEG/PNG/WebP, reducing file size while preserving quality
- ✅ Resize Function: Auto-resize by max width with responsive support
- ✅ Mockup Creation: Place images in iPhone/Android/PC frames for presentation materials
画像を高品質のまま圧縮してファイルサイズ削減。スマホ・PC枠のモックアップ作成も可能。ブラウザ完結で安全・無料。
🗜️ Image Compression
Compress image files while maintaining high quality
Drag & Drop Images
or
Supported: JPG, PNG, WebP
📱 Mockup Builder
Create professional mockups by placing images in smartphone or PC frames
Drag & Drop Images
or
Supported: JPG, PNG, WebP, GIF
How to Use
📌 Basic Image Compression Guide
Significantly reduce file size while maintaining high quality. Perfect for improving website loading speed.
- Step 1: Upload Images - Drag & drop or select files (multiple selection supported)
- Step 2: Adjust Quality - Set quality from 10-100% with slider (recommended: 80-85%)
- Step 3: Set Max Width - Optionally set max width for resizing (default: 1920px)
- Step 4: Start Compression - Click "Start Compression" button to begin processing
- Step 5: Download - Review compression results and download individually or all at once
📱 Mockup Creation Guide
Transform screenshots into professional mockups. Perfect for presentations and portfolios.
- Step 1: Upload Screenshot - Select app or website screenshot
- Step 2: Choose Device - Select from iPhone, Android, Laptop, or Desktop
- Step 3: Select Background - Choose from White, Gray, Gradient, or Transparent
- Step 4: Generate Mockup - Preview and download
💡 Use Cases
- Website Optimization: Improve Core Web Vitals and PageSpeed Insights scores
- Social Media: Optimize image sizes for Instagram, Twitter, Facebook
- Email Attachments: Compress large images to meet email size limits
- Portfolio Creation: Create mockups from app and website screenshots
- Presentations: Enhance visual impact with device-framed images
💼 Key Features
- 🔒 Secure Browser Processing - Images are never sent to servers. All processing happens in your browser for complete privacy
- ⚡ Fast & High-Quality Compression - Advanced algorithms minimize visual degradation while achieving 50-80% file size reduction
- 📱 Mockup Builder Included - Easily create professional mockups by placing images in iPhone, Android, Laptop, or Desktop frames
- 🎨 Flexible Customization - Freely adjust quality (10-100%), max width (100-4096px), and background color (white/gray/gradient/transparent)
- 📊 Batch Processing - Select and compress multiple images at once for efficient workflow
- 🚀 Core Web Vitals Improvement - Optimize LCP (Largest Contentful Paint) and boost PageSpeed Insights scores
- 📥 Easy Download - Compare before/after file sizes and download individually or all at once
- 🌐 Format Support - Supports JPEG, PNG, and WebP for next-generation compression
🚀 Core Web Vitals Improvement & Image Compression
Optimizing LCP (Largest Contentful Paint)
LCP measures the time it takes for the largest content element (usually an image or hero image) to display. Google rates under 2.5 seconds as "Good," and exceeding this negatively impacts SEO rankings.
Image compression can reduce file size by 50-80%, significantly improving LCP. For example, compressing a 3MB hero image to 300KB can reduce load time by about 2 seconds on 4G networks.
Impact on PageSpeed Insights Score
PageSpeed Insights identifies image optimization as a top priority improvement. Properly compressed images improve these metrics:
- LCP (Largest Contentful Paint): Target under 2.5 seconds
- FCP (First Contentful Paint): Faster initial content display
- CLS (Cumulative Layout Shift): Prevent layout shifts with explicit image dimensions
Compression Types: Lossy vs Lossless
- Lossy Compression (JPEG/WebP): Significantly reduces file size with some quality loss. Ideal for web images, with minimal visual degradation at 80-90% quality.
- Lossless Compression (PNG): Preserves quality while compressing. Use for logos and icons requiring transparency, though not ideal for photos.
- Next-Gen Formats (WebP/AVIF): Achieve 25-35% smaller file sizes than JPEG with equivalent quality. Widely supported by major browsers.
Recommended Settings & Best Practices
80-85% quality is the optimal balance. Higher settings rapidly increase file size with minimal visual improvement. Also, limiting max width to 1920px prevents wasteful 4K image downloads.
Combine with responsive images (srcset attribute) to deliver optimal sizes per device, further improving mobile performance.
Frequently Asked Questions
A. No, all processing happens in your browser, and images are never sent to any server.
A. Depending on quality settings, typically 30-80% reduction is possible. At 80% quality, expect around 50% reduction.
A. There's no technical limit, but around 10 images is recommended considering browser memory.
A. Depends on device type, but smartphones are around 1200px and PCs are around 2400px wide.
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