Lossy vs Lossless Image Compression Explained
Understanding the difference between lossy and lossless compression helps you make better decisions about image quality and file size trade-offs.
Lossless Compression
Lossless compression reduces file size without losing any image data. The original image can be perfectly reconstructed.
Formats
PNG, WebP (lossless mode), GIF, BMP
Pros
- Perfect quality reproduction
- Can be edited multiple times without degradation
- Best for graphics, logos, screenshots
Cons
- Larger file sizes
- Not ideal for photographs
Lossy Compression
Lossy compression permanently removes some image data to achieve smaller file sizes. The quality loss is often imperceptible at higher quality settings.
Formats
JPG, WebP (lossy mode)
Pros
- Much smaller file sizes
- Quality adjustable (you control the trade-off)
- Ideal for photographs and complex images
Cons
- Quality degrades with each re-save
- Can show artifacts at low quality
- Original cannot be recovered
Quality vs Size Trade-off
Typical file size reduction at different quality levels (JPG/WebP):
100%
No loss
90%
~40% smaller
80%
~60% smaller
60%
~75% smaller
Best Practices
- Keep originals: Always keep uncompressed originals for future edits
- Compress once: Export to final format only once to avoid cumulative quality loss
- Test settings: Compare quality at different levels to find the sweet spot
- Match content: Use lossless for graphics, lossy for photos
Test Compression Settings
Use our tool to convert images and experiment with different quality settings.
Try ConvertSpark