Resizing is often the perfect time to also optimize your image format. Rune's Image Resizer lets you change formats during the resize process.
Supported Formats
- JPG/JPEG: Best for photos, smaller files
- PNG: Lossless quality, transparency support
- WEBP: Modern format, best compression
Format Characteristics
| Format | Compression | Transparency | Best For |
|---|---|---|---|
| JPG | Lossy | No | Photos |
| PNG | Lossless | Yes | Graphics, text |
| WEBP | Both | Yes | Web (modern) |
How to Change Format
- Open Rune's Image Resizer.
- Upload your image.
- Set resize dimensions.
- Choose output format from dropdown.
- Adjust quality if needed.
- Download in new format.
When to Convert
PNG → JPG
- Photo doesn't need transparency
- Want smaller file size
- Web use where JPG is sufficient
JPG → PNG
- Need to add transparency later
- Want lossless quality for editing
- Graphics with text or sharp edges
Any → WEBP
- Modern web usage
- Best compression with quality
- All current browsers supported
Quality Settings by Format
| Format | Quality Setting | Effect |
|---|---|---|
| JPG | 70-85% | Balance size/quality |
| PNG | N/A | Always lossless |
| WEBP | 75-90% | Great balance |
File Size Comparison
Same image at 1200x800:
- PNG: ~3 MB
- JPG (80%): ~200 KB
- WEBP (80%): ~150 KB
Conclusion
Combine resizing with format conversion for optimal results. Rune's Image Resizer handles both in one step.