benchmark · WebP quality benchmark
WebP quality settings often give a useful size drop before visible artifacts become obvious.
Benchmark notes
| Quality | Output size | Change from q90 | Useful first test | Caution |
|---|---|---|---|---|
| 90 | 550 KB | Baseline | Near-source web export | Can be larger than JPEG q90 here |
| 80 | 346 KB | -37% | Default web trial | Review texture |
| 70 | 249 KB | -55% | Smaller web images | Check gradients |
| 60 | 201 KB | -63% | Upload limit trial | Check fine edges |
| 50 | 163 KB | -70% | Small target | Artifacts can show |
ImgShrink generated four repeatable samples with sharp: a photo-style gradient, a UI screenshot, a transparent graphic and a flat color illustration.
Each output was encoded with the stated format and quality setting, then measured by byte size before being rounded for the table.
Photo sample: 1600x1067 pixels. Screenshot sample: 1365x768 pixels. Transparent sample: 512x512 pixels. Flat graphic sample: 1200x800 pixels.
WebP used quality 78 for the cross-format table, AVIF used quality 50, and JPEG baselines used quality 90 unless a quality row states otherwise.
Quality 80 was 346 KB.
Quality 70 reduced the sample to 249 KB.
Quality 50 reached 163 KB and needs close review.
These values are benchmark results for the sample set, not a promise for every uploaded file.
Real images vary by noise, detail, transparency, dimensions, browser encoder and the target platform's accepted formats.
No. They are measured sample results that help choose a first setting to test.
No. They use generated samples and browser-style encoding assumptions.
Updated October 8, 2026 · Source checked: 2026-10-08
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