Convert PNG to JPEG
Drop PNG files and download smaller JPEGs at the same dimensions. PNG is lossless and great for graphics, but it bloats photographic images. JPEG compresses photos far more efficiently, which is why this conversion is mostly about file size.
JPEG output is lossy at a high-quality setting. Photographs convert cleanly; flat color, text, and sharp edges can show JPEG artifacts, so those are better left as PNG.
Transparency becomes white
JPEG cannot store transparency, so any transparent pixels in the PNG are flattened onto a solid white background. If the artwork needs to stay transparent, convert to WebP instead, which keeps the alpha channel.
Batch and privacy
Add multiple files, convert, and use Download all as ZIP for the whole set. Conversion runs in your browser through Web Workers, in parallel; nothing is uploaded, and metadata is dropped when the image is re-encoded.