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Unblur image online free

Unblur image online free. Fix blurry photos with our unblur tool — adjust sharpening amount and radius to reduce motion blur and focus issues. Private browser-based processing with no server upload.

What is an image unblur tool?

An image unblur tool (also called a photo sharpener, deblur tool, or image deblurrer) uses image processing algorithms to reduce blurriness and enhance detail in photos. Our tool implements the unsharp mask technique: it creates a blurred copy of the original image using a box blur, calculates the difference (the fine details lost to blur), and amplifies those details back into the image. The Amount slider controls how strongly the details are amplified, while the Radius slider determines the scale of details being sharpened. Unlike AI-based deblurring, this method works directly on pixel data using canvas-based computation — all within your browser without uploading images to any server.

Photo unblur features

Sharpen blurry images with advanced unsharp mask filtering.

  1. Unsharp mask filter: Professional-grade sharpening algorithm that enhances edges and details.
  2. Adjustable amount: Control the sharpening strength from subtle enhancement to strong deblurring.
  3. Adjustable radius: Set the detail radius — smaller for fine textures, larger for broad edges.
  4. Live preview: See the unblur effect update instantly as you adjust settings.
  5. Browser-based: No server upload or account required — your privacy is protected.
  6. PNG or JPEG export: Download the sharpened result as a PNG or JPEG file.

How to unblur an image

Fix blurry photos in a few simple steps.

  1. Upload your photo: Select a blurry PNG, JPEG, WebP, or GIF file from your device.
  2. Adjust amount: Increase the Amount slider to apply more sharpening.
  3. Adjust radius: Tune the Radius slider to match the size of blur in your image.
  4. Choose format: Select PNG or JPEG as the output format.
  5. Download: Save the sharpened image to your device.

Tips for unblurring images

Get the best results when sharpening blurry photos.

  1. Start with amount 30–50: Begin with a moderate amount setting and increase gradually to avoid over-sharpening artifacts.
  2. Match radius to blur size: Use a smaller radius (1–3) for fine detail blur, larger radius (4–10) for broader blur.
  3. Avoid over-sharpening: Too much sharpening creates visible halos and noisy edges. Aim for natural-looking results.
  4. Use the preview: Toggle the preview to compare the original and sharpened versions before downloading.

Great for

When to use an image unblur tool.

  1. Fixing motion blur: Reduce blur from camera shake or moving subjects in photos.
  2. Sharpening old photos: Restore detail and clarity in scanned or digitized old photographs.
  3. Enhancing screenshots: Sharpen blurry text or UI elements in screenshots.
  4. Improving low-light photos: Reduce softness caused by low-light photography.
  5. AI-generated images: Sharpen AI-generated images that sometimes appear slightly soft.
  6. Product photos: Make product images crisper for e-commerce and listings.

Why use this unblur tool

Fast, private, effective image sharpening.

  1. 100% free: No sign-ups, no limits, no hidden costs.
  2. Privacy first: All processing happens locally in your browser.
  3. Dual controls: Amount and Radius give you precise control over the sharpening effect.
  4. No app needed: Works directly in your browser on any device.

Technical details

How the unblur tool works.

  1. Algorithm: Unsharp mask: original + amount × (original − blurred). The blurred copy is created with a fast separable box blur.
  2. Box blur: Two-pass (horizontal + vertical) O(n) separable box blur for performance.
  3. Amount range: 0 (no effect) to 100 (maximum sharpening).
  4. Radius range: 1 (fine details) to 10 (broad edges).
  5. Input limits: 15 MB max file size.
  6. Export formats: PNG (lossless) or JPEG (configurable quality).

Frequently Asked Questions

Have questions? We have answers.

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