What “compress PNG” can and cannot do here
True PNG crushers (pngquant, oxipng, zopflipng) spend CPU hunting palettes and filters. A browser canvas does not. If you re-export a photo as PNG from this tab, do not expect a miracle. If you export a logo that was a 4K photograph of a logo, convert it to WebP with transparency or crop it first.
Screenshots of dark IDEs, invoice tables, and app chrome still belong on PNG or lossless WebP. JPEG ringing around letters is why so many “compressed” help docs look dirty. Use the format menu deliberately.
Read PNG photos vs logos before you batch a folder called Camera Roll.