Sharpen Image

Enhance image sharpness and clarity with professional unsharp mask algorithm. Ad...

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Updated

Drop your image here

or click to browse

Supports JPG, PNG, GIF, WebP, BMP

SSL Secured
256-bit Encryption
Cloud Processing
Mobile Friendly

Features

Instant - Real-time preview
Adjustable - Fine-tune settings
Presets - Quick options
Private - No upload
Mobile - Works anywhere
Free - No limits

Why Use Sharpen Image?

Unsharp Mask Algorithm

Professional-grade sharpening using the same technique as Photoshop. Precise edge enhancement without artifacts.

Full Control

Adjust amount, radius, and threshold independently. Fine-tune sharpening for perfect results.

Nothing Uploaded

All processing happens in your browser using Canvas API. Your images never leave your device.

Instant Preview

See sharpening effects in real-time as you adjust settings. No waiting, no button clicks.

Before/After View

Compare original and sharpened versions side by side. See exactly what changed.

Works Everywhere

Mobile-friendly interface. Sharpen images on any device with a web browser.

Common Uses

Photography

Enhance photo details after resizing for web.

Web Graphics

Make website images appear crisp and clear.

Document Scans

Improve text clarity in scanned documents.

Social Media

Sharpen images before sharing on platforms.

How It Works

1

Upload Your Image

Drag and drop your image onto the upload area or click to browse. Supports JPG, PNG, GIF, WebP, and BMP.

2

Adjust Settings

Use the sliders to control sharpening amount, radius, and threshold. Or use quick presets for common scenarios.

3

Preview Changes

Watch the sharpening effect apply in real-time. Compare with the original using the thumbnail view.

4

Download Result

Download your sharpened image as a high-quality PNG file. Original quality preserved.

Pro Tips

Start Subtle

Begin with the 'Subtle' preset and increase gradually. Over-sharpening creates ugly halos and noise artifacts.

Use Threshold for Noise

If your image has noise or grain, increase threshold to 5-10 to prevent sharpening the noise.

Don't Over-Sharpen

If you see bright halos around edges, reduce the Amount setting. Natural sharpening should be barely noticeable.

Frequently Asked Questions

Unsharp mask is a professional sharpening technique that enhances edge contrast. It works by subtracting a blurred version from the original image, then adding that difference back. This creates sharper-looking edges without introducing noise in smooth areas.
Amount controls how much sharpening is applied (higher = more dramatic). Radius determines the size of the sharpening halo (larger radius affects more pixels around edges). Threshold prevents sharpening of noise by ignoring subtle differences.
For web images, try Amount: 80-120%, Radius: 0.5-1px, Threshold: 0-5. This provides noticeable sharpening without creating visible halos. For high-res print images, use lower amount with larger radius.
Sharpening can improve slightly soft images by enhancing edges. However, it cannot recover lost detail from motion blur or out-of-focus images. Severely blurred photos won't be magically restored to sharp quality.
Halos appear when sharpening is too aggressive. Reduce the Amount setting or increase Threshold to minimize halos. The 'Subtle' preset is a good starting point for natural-looking results.
Subtle (50%, 0.5px, threshold 5) is gentle and natural. Medium (100%, 1px, threshold 0) is good for most photos. Strong (150%, 2px, threshold 0) creates dramatic enhancement for web graphics or text.
Yes, completely free with no limits, no watermarks, no signup required. Sharpen as many images as you need at no cost.
No. All sharpening happens directly in your browser using the HTML5 Canvas API. Your images never leave your device - we physically cannot see them.

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