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Blur image online

Blur pictures and PNG photos online with Gaussian, motion, stack, box, radial, or soften filters. Adjust strength, preview live, download PNG in your browser.

What is image blur?

Image blur smooths or streaks pixels using convolution-style filters. Choose stack, Gaussian, motion, box, radial, heavy radial, or soften modes, adjust the controls for that filter, preview side by side, and download PNG—all in your browser. The effect applies to the whole upload: there is no blur pen, text mask, or one-click background isolation, and it does not unblur sharp photos.

Blur filter types

Seven blurring modes with type-specific controls.

  1. Stack blur: Fast stacked smoothing with radius control.
  2. Gaussian blur: Soft Gaussian-style falloff via multi-pass box blur.
  3. Motion blur: Directional streaks with kernel size and degrees.
  4. Box blur: Classic separable box average blur.
  5. Radial blur: Zoom blur from adjustable horizontal and vertical center.
  6. Heavy radial blur: Stronger radial streaks with the same center controls.
  7. Soften: 3×3 or 5×5 low-pass mean filter with strongness blend.

How to blur a photo

Steps for online picture blurring.

  1. Upload the image: Drop or click in the input panel (15 MB max).
  2. Pick a filter type: Select stack, Gaussian, motion, box, radial, heavy radial, or soften.
  3. Tune controls: Radius, kernel, degrees, center, size, strongness, or mask size depending on type.
  4. Download PNG: Save when the blurred preview matches your goal.

Tips for blurring images

Better blur results.

  1. Start with low radius: Increase radius gradually—heavy blur is hard to undo without the original.
  2. Resize large photos first: Downscale on /resize-image before extreme radius values for faster runs.
  3. Motion blur angle: Match degrees to the direction of movement in the scene.
  4. Radial center: Place the center on the subject for zoom-style emphasis.
  5. Partial blur workaround: Crop the area to blur on /crop-image, blur that file, then layer in your editor.
  6. Compare filters: Switch types on the same upload to pick the look you need.

When to blur images

Typical uses for blur filters.

  1. Soft photo backgrounds: Gaussian or stack blur for overall background softening—not selective masking.
  2. Motion effects: Motion blur for speed lines and action shots.
  3. Privacy before sharing: Blur a whole crop that contains sensitive details before posting.
  4. Depth cues: Radial blur for zoom or spin emphasis from a chosen center.
  5. UI mockups: Soften or Gaussian blur on hero images behind modal concepts.
  6. Light noise smoothing: Gentle soften or box blur on mildly noisy photos.

Why use this blur tool

Benefits of browser-based blurring.

  1. Seven filter modes: Gaussian, motion, stack, and more on one page.
  2. Live preview: Output updates as you change type and sliders.
  3. Private: Images stay on your device—no server upload.
  4. Type-specific controls: Only relevant sliders show for each filter.
  5. PNG export: Download blurred PNG with alpha when the upload had transparency.
  6. Free: Unlimited previews and PNG downloads.

Technical details

How blur processing works here.

  1. Separable box blur: Horizontal and vertical passes for box, stack, and Gaussian modes.
  2. Gaussian approximation: Three box passes with weighted radii approximate Gaussian falloff.
  3. Motion sampling: Averages pixels along a line at the chosen angle and kernel length.
  4. Radial sampling: Zoom-blur samples from center toward each pixel; heavy mode uses more steps.
  5. Soften mean filter: 3×3 or 5×5 neighborhood average blended by strongness.
  6. Input limits: 15 MB upload; 8192 px max edge; radius and kernel capped at 100.

Frequently Asked Questions

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