benchmark · PNG compression benchmark
PNG results depend heavily on image type; flat graphics and screenshots can shrink a lot without changing dimensions.
Benchmark notes
| Sample | Level 0 | Level 6 | Level 9 | Palette 128 |
|---|---|---|---|---|
| UI screenshot | 4.01 MB | 28 KB | 10 KB | 3 KB |
| Transparent graphic | 1.00 MB | 21 KB | 18 KB | 5 KB |
| Flat illustration | 3.67 MB | 29 KB | 12 KB | 3 KB |
| Best observed setting | Palette 128 | Palette 128 | Palette 128 | Check color count |
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.
Compression level 9 improved all PNG samples.
Palette PNG was smallest for these generated flat samples.
Photo-style images usually need JPEG, WebP or AVIF instead.
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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