Measured results
ExactSizer image compression accuracy benchmark
We generated three deterministic images and ran nine real compression jobs in Chromium. These are the resulting bytes, including the imperfect differences.
Tested:
9
real test runs
9/9
at or below target
0.28%
average below target
| Format | Source file | Target | Output | Difference |
|---|---|---|---|---|
| JPG → JPG | 1,138.79 KB (1,166,125 bytes) | 50 KB (51,200 bytes) | 49.89 KB (51,092 bytes)1,595 × 1,196 px | 0.21% below target |
| JPG → JPG | 1,138.79 KB (1,166,125 bytes) | 100 KB (102,400 bytes) | 99.95 KB (102,351 bytes)1,550 × 1,163 px | 0.05% below target |
| JPG → JPG | 1,138.79 KB (1,166,125 bytes) | 200 KB (204,800 bytes) | 199.86 KB (204,657 bytes)1,473 × 1,104 px | 0.07% below target |
| PNG → WebP | 2,472.30 KB (2,531,631 bytes) | 50 KB (51,200 bytes) | 49.96 KB (51,160 bytes)1,600 × 1,200 px | 0.08% below target |
| PNG → WebP | 2,472.30 KB (2,531,631 bytes) | 100 KB (102,400 bytes) | 99.48 KB (101,870 bytes)1,560 × 1,170 px | 0.52% below target |
| PNG → WebP | 2,472.30 KB (2,531,631 bytes) | 200 KB (204,800 bytes) | 199.40 KB (204,184 bytes)1,065 × 799 px | 0.30% below target |
| WebP → WebP | 999.47 KB (1,023,462 bytes) | 50 KB (51,200 bytes) | 49.96 KB (51,156 bytes)1,520 × 1,140 px | 0.09% below target |
| WebP → WebP | 999.47 KB (1,023,462 bytes) | 100 KB (102,400 bytes) | 99.37 KB (101,752 bytes)1,338 × 1,003 px | 0.63% below target |
| WebP → WebP | 999.47 KB (1,023,462 bytes) | 200 KB (204,800 bytes) | 198.78 KB (203,548 bytes)1,600 × 1,200 px | 0.61% below target |