Protect sensitive information, create depth-of-field background effects, or add artistic softening to photos with our free Online Image Blur Tool. Featuring five distinct filtering algorithms—Gaussian, Motion, Radial Bokeh, Pixelate Mosaic, and Frosted Glass—plus brightness, contrast, and dark vignette controls, the tool renders custom blur effects directly inside HTML5 Canvas element memory. Adjust blur radius, motion angle, clear focal areas, and compression quality in real time without sending graphic files to external cloud servers.
Drag and drop your local image file (PNG, JPG, WebP, or GIF) onto the workspace drop area or click Browse File.
Open Options panel to choose Gaussian, Motion, Radial, Pixelate, or Frosted Glass blur and adjust intensity, brightness, contrast, and vignette controls.
Click Blur Image to process the effect and download your blurred photo in PNG, JPEG, or WebP format.
Choose between standard Gaussian softening, directional Motion streaks, focal Radial Bokeh, privacy Pixelate censoring, and Frosted Glass grain textures.
Applies 2D spatial convolution matrices dynamically to local canvas pixel arrays, providing instant live previews as sliders are adjusted.
All image manipulations execute entirely inside browser memory sandbox. Your photos are never transmitted over a network or stored on cloud servers.
Digital image blurring relies on 2D spatial convolution filtering across a raster pixel grid. Standard Gaussian Blur calculates new color values for each pixel by taking a weighted average of surrounding neighbor pixels using a two-dimensional Gaussian distribution (bell curve) kernel. The standard deviation (sigma) of the Gaussian function correlates directly to the user-specified blur radius in pixels, resulting in smooth, natural visual softening without harsh edge artifacts.
Advanced blur modes alter kernel geometry. Motion Blur computes linear offset vectors along a specific angle degree (θ), accumulating multiple transparent image shifts to emulate camera movement. Pixelate (Mosaic) downsamples pixel blocks by averaging sub-region colors on a scaled-down canvas before upscaling back with nearest-neighbor interpolation (imageSmoothingEnabled = false), rendering clean pixel blocks ideal for censoring sensitive data like faces or license plates.
Because HTML5 Canvas handles image manipulation in client-side WebGL or 2D Context RAM, processing occurs at native GPU speeds. Users can refine blur settings interactively, adjust brightness, contrast, or dark vignette overlays, and export uncompressed PNGs, compressed JPEGs, or modern WebP graphics without compromising image dimensions or sending graphics across third-party networks.