Complete Image Conversion & Editing Guide
Free tools for converting between JPEG, PNG, WebP, HEIC formats, resizing, optimizing, and applying filters - everything you need for image processing.
Image Format Basics
Understanding Major Image Formats
JPEG (Joint Photographic Experts Group)
Best for photographs and images with complex colors. Uses lossy compression for smaller file sizes but quality degrades with high compression. No transparency support.
Use cases: Photos, landscapes, gradient images Pros: Small file size, widely supported Cons: No transparency, degrades with editing
PNG (Portable Network Graphics)
Lossless compression format with transparency support. Ideal for illustrations, logos, and screenshots, but creates larger files for photos.
Use cases: Logos, icons, screenshots, images needing transparency Pros: High quality, transparency, lossless Cons: Large file sizes
WebP
Next-gen format by Google. 25-35% smaller than JPEG with same quality. Supports transparency and animation.
Use cases: Website images, mobile images Pros: High compression, transparency, animation Cons: Limited browser support
HEIC/HEIF (High Efficiency Image Format)
Apple's efficient format. Half the size of JPEG with equal or better quality.
Use cases: iPhone/iPad photos, high-quality storage Pros: High compression, high quality, rich metadata Cons: Poor Windows/Android compatibility
Choosing the Right Format for SEO
Maximizing Web Performance with Image Formats
1. Choose WebP First
Modern browsers support WebP, significantly reducing file size while maintaining quality. Directly improves Core Web Vitals.
2. Fallback Strategy
Use <picture> tag to provide JPEG/PNG fallbacks for browsers without WebP support.
3. Format Recommendations by Use
- Photos/Backgrounds: WebP → JPEG
- Logos/Icons: SVG → WebP → PNG
- Screenshots: WebP → PNG
- Animations: WebP → GIF
Contents
Basic Image Conversion Steps
Convert images in 3 easy steps
Select File
Drag & drop or click to select image files. Multiple file processing is also supported.
Choose Format & Settings
Select output format and adjust quality, size, compression ratio and other settings as needed.
Convert & Download
Click convert button to start processing. Download starts automatically when complete.
Image Format Comparison
| 機能 | JPEG | PNG | WebP | HEIC |
|---|---|---|---|---|
Compression Type | 非可逆 | 可逆 | 両対応 | 非可逆 |
Transparency Support | ||||
Animation | ||||
Browser Support | 100% | 100% | 95% | 30% |
Relative File Size Same quality comparison | 100% | 200% | 70% | 50% |
Best Use Case | 写真 | ロゴ・アイコン | Web画像全般 | モバイル写真 |
Frequently Asked Questions
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