Format Guides
Lossless vs Lossy Compression: Understanding File Compression
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Apps66 Team
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Understanding the difference between lossless and lossy compression helps you choose the right approach for different files and use cases.
Lossy Compression
Permanently removes data deemed "less important" to reduce file size significantly.
Examples
- JPG images
- MP3 audio
- H.264/H.265 video
Pros
- Much smaller files (50-90% reduction)
- Often imperceptible quality loss
- Ideal for distribution
Cons
- Quality loss is permanent
- Each re-save degrades further
- Not suitable for editing/archival
Lossless Compression
Reduces file size without losing any data. Original can be perfectly reconstructed.
Examples
- PNG images
- FLAC audio
- ZIP archives
Pros
- Perfect quality preservation
- Ideal for editing and archival
- No generation loss
Cons
- Larger files than lossy
- Limited compression ratios
When to Use Each
- Lossy: Final distribution, web, sharing, when file size matters
- Lossless: Editing, archival, source files, when quality is paramount
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Frequently Asked Questions
For images at 85%+ quality, most people can't. For audio, differences are subtle on typical equipment.
Yes, always keep lossless masters. You can create lossy versions for distribution anytime.
No - lossless compression reduces size with zero quality loss. Always use it when available.
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Written by Apps66 Team
The Apps66 team creates helpful tutorials and guides to help you get the most out of file conversion and online tools.
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