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Unblur image online free

Reduce mild blur with amount and radius controls. Compare the preview, then export PNG or JPEG.

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.

  • Unsharp mask filter

    Professional-grade sharpening algorithm that enhances edges and details.

  • Adjustable amount

    Control the sharpening strength from subtle enhancement to strong deblurring.

  • Adjustable radius

    Set the detail radius — smaller for fine textures, larger for broad edges.

  • Live preview

    See the unblur effect update instantly as you adjust settings.

  • Browser-based

    No server upload or account required — your privacy is protected.

  • 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.
  • 01

    Start with amount 30–50

    Begin with a moderate amount setting and increase gradually to avoid over-sharpening artifacts.

  • 02

    Match radius to blur size

    Use a smaller radius (1–3) for fine detail blur, larger radius (4–10) for broader blur.

  • 03

    Avoid over-sharpening

    Too much sharpening creates visible halos and noisy edges. Aim for natural-looking results.

  • 04

    Use the preview

    Toggle the preview to compare the original and sharpened versions before downloading.

Unblur Tools Compared

Sharpening/deblur options and when this unsharp-mask tool fits.

  • Blur Image (Uwarp)

    Adds blur. Use Unblur when you need the opposite: edge recovery.

  • Sharpen Image (Uwarp)

    General sharpening control. Unblur targets mild motion/focus blur recovery.

  • AI unblur SaaS tools

    Sometimes recover severe blur; usually require upload and usage limits.

  • This unblur tool

    Amount + radius unsharp mask, local preview, PNG/JPEG export. Free.

Great for

When to use an image unblur tool.

  • Fixing motion blur

    Reduce blur from camera shake or moving subjects in photos.

  • Sharpening old photos

    Restore detail and clarity in scanned or digitized old photographs.

  • Enhancing screenshots

    Sharpen blurry text or UI elements in screenshots.

  • Improving low-light photos

    Reduce softness caused by low-light photography.

  • AI-generated images

    Sharpen AI-generated images that sometimes appear slightly soft.

  • Product photos

    Make product images crisper for e-commerce and listings.

Why use this unblur tool

Fast, private, effective image sharpening.

  • 100% free

    No sign-ups, no limits, no hidden costs.

  • Privacy first

    All processing happens locally in your browser.

  • Dual controls

    Amount and Radius give you precise control over the sharpening effect.

  • No app needed

    Works directly in your browser on any device.

Technical details

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

Sources & References

Authoritative references on deblurring, unsharp masking for image restoration, and the Canvas rendering technology this tool uses.
  • “Deblurring is the process of removing blur from images.”
    — Wikipedia — Deblurring

    Deblurring in image processing: Deblurring techniques aim to reverse the effects of motion blur, defocus, or other image degradation. This tool uses an unsharp mask filter — a practical deblurring method that amplifies high-frequency details. en.wikipedia.org/wiki/Deblurring

  • “The Canvas API provides a means for drawing graphics via JavaScript and the HTML canvas element.”
    — MDN Web Docs — Canvas API

    Canvas API (client-side pixel manipulation): This unblur tool applies the unsharp mask algorithm using Canvas getImageData and putImageData — creating a blurred copy, computing the detail layer, and amplifying it — all in your browser without server uploads. developer.mozilla.org/en-US/docs/Web/API/Canvas_API

  • “PNG supports lossless data compression, making it useful for storing graphics that need to be edited repeatedly without losing quality.”
    — W3C — PNG Specification (overview)

    PNG image format: PNG output preserves the sharpened details from the unblur process without compression artifacts, making it ideal for restored or enhanced images. w3.org/TR/PNG/

  • “Unsharp masking is an image sharpening technique that works by subtracting a blurred version of an image from the original to enhance edges.”
    — Wikipedia — Unsharp masking

    Unsharp masking technique: This deblurring tool applies unsharp masking — a classic technique that subtracts a blurred copy to recover edge detail, helping reverse mild motion or focus blur. en.wikipedia.org/wiki/Unsharp_masking

Frequently Asked Questions

Quick answers about this tool—open a question to read more.