Key takeaways
- 5.56:1 and 82.0% saved for 250 MB to 45 MB.
- A ratio below 1:1 means the output grew, which happens when converting to a lossless format or to GIF.
Ratio is not quality
A ratio compares two sizes. A ratio of 5:1 means the output is a fifth of the input and says nothing about how it looks or sounds. Compare ratios only between files of the same content and format.
Ratios below 1:1 are normal when a lossy source goes to a lossless format or to GIF: the output grows because it stores more than the source did.
Scenarios
| Scenario | Compression ratio | Space saved | Resulting bitrate |
|---|---|---|---|
| 250 MB to 45 MB | 5.56:1 | 82.0% | 6,291 kbps |
| 1 GB to 100 MB | 10.24:1 | 90.2% | 13,981 kbps |
| 100 MB to 80 MB | 1.25:1 | 20.0% | 11,185 kbps |
| 10 MB to 25 MB (grew) | 0.40:1 | -150.0% | 3,495 kbps |