Digitizing the family archive?
BMPs usually come from old scanning software and 2000s-era Windows. For scanned photos, JPG at high quality is the right call. For line art, documents with text, or anything you'll edit further, PNG keeps every pixel losslessly. Batch a whole folder and flip Auto-download for one zip back.
FAQ
Why are BMPs so big?
Zero compression — every pixel stored raw. A 10-megapixel scan is ~30 MB as BMP, ~2 MB as high-quality JPG, identical to the eye.
Are my scans uploaded?
Never — decoding and encoding happen in your browser. Family photos stay in the family.