PNG output ignores the quality slider because PNG is lossless. Transparent PNGs become solid on JPEG; keep PNG or WebP to preserve transparency.
Compression runs on your device. Your images are never uploaded.
Frequently asked questions
How much smaller will my image get?
It depends on the photo and settings. Quality 80 with a sensible max width typically cuts JPG photos by 50 to 80 percent with barely visible difference.
Will compression ruin image quality?
Mild compression is nearly invisible. Compare the side-by-side preview before downloading, and raise the quality slider if you see artifacts.
Are my photos uploaded anywhere?
No. Compression happens in your browser, so your photos never leave your device.
Preview
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