What is Image Sharpener?
Image Sharpener uses an unsharp mask convolution to enhance edge detail and clarity in blurry or soft images. It runs entirely in your browser, so your photos are never uploaded anywhere.
How to Use Image Sharpener
- Upload an image by clicking the drop zone or dragging a file onto it.
- Adjust the Sharpness slider to increase or decrease edge enhancement.
- Click Download to save the sharpened image to your device.
Understand Image Sharpening ▾
Example
Common Use Cases
- Sharpen slightly blurry photos before sharing
- Enhance detail in scanned documents or old photos
- Increase edge clarity in product or food photography
- Quick touch-up without opening a full image editor
Why Use This Tool
- Applies a proper unsharp mask kernel for clean, artifact-free sharpening.
- Runs entirely in your browser —no server, no uploads, no account needed.
- Instant live preview so you can see the effect before downloading.
Frequently Asked Questions
No. All sharpening happens entirely in your browser using the Canvas API. Your image never leaves your device.
You can upload any format your browser supports, including JPG, PNG, WebP, and GIF. The output is downloaded as PNG (lossless) or JPEG depending on the original format.
Unsharp masking enhances edge contrast and does not reduce image resolution. However, very high sharpness values can introduce visible halos around edges, so moderate settings usually produce the best results.
Unsharp mask is a classic sharpening technique. It subtracts a blurred version of the image from the original to amplify edge details. Despite the name, it makes images look sharper by increasing local contrast at edges.