The table below shows a test image (kodim23.qoi from the QOI test images) saved in a variety of formats. Load time is taken from IrfanView, other applications may be faster or slower loading. As with all statistics, your results may vary!
| Format | File Size (KB) | Load Time (ms) |
|---|---|---|
| JPEG XL | 374 | 562 |
| QOI | 660 | 31 |
| PNG | 545 | 32* |
| WebP | 415 | 156 |
* This is close to the QOI in part due to the small image size, tests on a larger (1080p) image show QOI is 3x faster loading.
The table lists JXL as the smallest and QOI as the fastest, yet neither would be suitable for a web page! For a web page and looking at the table, WebP seems like the best option but depending on your visitors, you may need to offer PNG as a fall back to support older browsers. At that point you may need to also consider the space / cost required to store two of each image...
Other image formats:
GIF |
JPEG |
JPEG XL |
PNG |
QOI |
WEBP
Comparison
Updated (20/06/2026)