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Image Sharpener

Bring back detail in soft photos with a controllable sharpening kernel.

Sharpen an image

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Sharpening runs on a local canvas and your photo is never uploaded.

How to use the Image Sharpener

  1. Choose the soft or blurry photo you want to sharpen.
  2. Adjust the amount slider until the edges look crisp but not harsh.
  3. Click Download to save the sharpened image as a PNG file.

Features

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Frequently Asked Questions

Common questions about the free online image sharpener.

Choose your photo, raise the amount slider until the detail looks crisp in the preview, then click Download to save the PNG.
No. The pixels are read from a canvas in your browser and sharpened locally, so your image never leaves your device.
Each pixel is recalculated from its eight neighbours with a 3x3 kernel that boosts local contrast, which makes edges look crisper.
Start around 0.5 and stop as soon as the image looks crisp. Too much sharpening creates bright halos and visible noise.
Only partly. Sharpening emphasises edges that already exist, but it cannot recover detail that the camera or lens never captured.
The kernel amplifies differences between neighbouring pixels, so film grain and sensor noise get amplified along with real detail.
Resize first, then sharpen. Sharpening a full size image and then shrinking it simply throws the extra edge contrast away.
Yes. The tool is fully responsive and works in any modern browser on phones, tablets and desktop computers.
Yes. It is completely free and unlimited, with no account, no sign-up and no watermark on your downloaded image.

Last updated: October 10, 2026