How to Convert Images Between Formats
A practical guide to converting between image formats like JPEG, PNG, WebP, SVG, and HEIC. Learn which conversions are lossless, which involve quality trade-offs, and which format to choose for different use cases.
Key Takeaways
- Image format conversion changes how pixel data is stored and compressed.
- The most common conversion: iPhone photos saved as HEIC need to be converted to JPEG for universal sharing.
- ### SVG to PNG (Rasterization) Vector SVG files must be rasterized to PNG for platforms that require bitmap images.
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Understanding Format Conversion
Image format conversion changes how pixel data is stored and compressed. Some conversions are lossless (PNG to WebP lossless), while others involve quality decisions (JPEG to WebP lossy). Understanding the trade-offs helps you choose the right approach.
Common Conversion Scenarios
HEIC to JPEG (iPhone Photos)
The most common conversion: iPhone photos saved as HEIC need to be converted to JPEG for universal sharing. Use quality 92+ to preserve the HEIC quality advantage.
PNG to WebP (Web Optimization)
Converting PNG to WebP lossless typically saves 25-35% file size with identical quality. For photographs stored as PNG, WebP lossy at quality 85 provides even greater savings.
SVG to PNG (Rasterization)
Vector SVG files must be rasterized to PNG for platforms that require bitmap images. Always specify the output resolution and use 2x dimensions for Retina displays.
Conversion Quality Matrix
| From | To | Quality Impact |
|---|---|---|
| PNG | WebP lossless | Lossless |
| JPEG | WebP lossy | Minimal loss |
| HEIC | JPEG | Slight loss |
| SVG | PNG | Resolution-dependent |
| BMP | PNG | Lossless (smaller) |