Different image formats compress differently. Choosing the right format significantly affects file size and quality.
Format Characteristics
JPG (JPEG)
- Compression: Lossy
- Transparency: No
- Best for: Photos, images with gradients
- File size: Small
- Quality: Good (adjustable)
PNG
- Compression: Lossless
- Transparency: Yes
- Best for: Graphics, text, logos
- File size: Larger
- Quality: Perfect (no loss)
WEBP
- Compression: Both lossy and lossless
- Transparency: Yes
- Best for: Web (all content types)
- File size: Smallest
- Quality: Excellent
Size Comparison
Same image at comparable quality:
| Format | Size |
|---|---|
| PNG | 3 MB |
| JPG (80%) | 400 KB |
| WEBP (80%) | 300 KB |
When to Use Each
Use JPG When:
- Photos and photographs
- Web use (broad compatibility)
- Size matters more than perfection
Use PNG When:
- Need transparency
- Graphics with sharp edges/text
- Quality is critical
- Will edit further
Use WEBP When:
- Modern web use
- Best compression needed
- Transparency + good compression
- Target audience uses modern browsers
Converting in Rune
- Open Rune's Image Compressor.
- Upload any format.
- Select desired output format.
- Adjust quality.
- Download in new format.
Browser Support (WEBP)
- Chrome, Firefox, Edge: ✅
- Safari: ✅ (since 2020)
- Older browsers: No
Conclusion
Format choice significantly impacts compression. Rune's Image Compressor supports all formats with easy conversion.