Free, runs entirely in your browser — no sign-up, no file upload to a server.
What does Image Sharpen do?
It enhances edges and fine detail in a photo using an adjustable sharpening filter, with a live before/after preview.
Where is my image processed?
Entirely in your browser — the file is never uploaded.
Can over-sharpening cause visible artifacts?
Yes, pushing the intensity too high can introduce visible haloing around edges — back the slider off if you see that.
How do I report a problem or request a feature for this tool?
Use the Contact / Feedback page — select "Image Sharpen" as the related tool so we know exactly which tool you mean, then describe the bug or the feature you'd like to see.