Add more definition to slightly soft or downsized photos. Adjust the level and process several at once.
No sign-up and nothing uploaded to a server: everything happens in your browser. See for yourself.
No. Everything is processed inside your browser, and your files never leave your device.
No. It only improves the apparent sharpness of slightly soft photos.
Try between 40% and 80%; more than that usually looks artificial.
This filter enhances edges so the photo looks more defined. It works well with slightly soft photos or ones that were reduced in size.
It's not magic: a photo with heavy motion blur or out of focus can't be recovered. A very high level can produce halos and noise.