Sharpen Image

No — the sharpen tool runs entirely in your browser using the Canvas API. Your image is loaded, sharpened and downloaded on your own device — it is never sent to a server, logged or stored. It keeps working offline once the page has loaded, and closing the tab clears everything.

Sharpening increases the contrast along edges so a slightly soft photo looks crisper, but it cannot invent detail that was never captured — a badly out-of-focus or motion-blurred shot has lost information that no sharpening can restore. It works best on images that are only a little soft, such as a mild focus miss or a resized photo. Push the amount too far on a heavily blurred photo and you mostly amplify noise and haloing instead of recovering real detail.

Start low and raise the amount until edges look defined but natural. Push it too far and you get halos — bright or dark outlines around edges — and amplified noise. The live preview updates as you drag the slider, so stop just before the halos appear.

No — sharpening only adjusts pixel values to boost edge contrast; the pixel dimensions and resolution stay exactly the same. If you also need to change the size, run the result through the Image Resizer afterwards. The file size can shift slightly after re-encoding, since sharpened edges compress a little differently than the original pixels.

JPG, PNG, WebP, GIF and BMP are accepted as input, and you can export as PNG, JPG or WebP. Animated GIFs are flattened to their first frame, like any canvas-based tool. PNG keeps the result lossless, while JPG and WebP give a smaller file at a quality level you choose.