Blurred Frame Generator – Add a Soft Image Border

What Online Image Blur Border Generator does

Extend an image canvas with a blurred background frame. The tool scales a copy of the source to cover the entire output canvas, blurs it, and places a sharp, fully visible version of the original centered on top. This creates a soft border effect for images whose aspect ratio does not match the output dimensions.

Worked example

How the pixels are processed

The source is first scaled to cover the entire output canvas, centered, and drawn as the blurred background. The filter is then cleared. A second sharp copy is scaled to fit completely inside the output and centered over the background. Source and output aspect ratios determine whether blurred bands appear at the sides or top and bottom.

Useful workflows

• Prepare web graphics, product images, presentations or visual test fixtures.
• Compare the preview at 100% zoom before exporting the result.
• Keep consistent settings across related images.

Quality, privacy and compatibility checks

• Repeated lossy export can reduce quality; retain an original and choose an appropriate output format.
• Very large dimensions or batches can exceed browser memory even when total file size appears small.
• Metadata, color profiles, animation and transparency may not be preserved by every canvas export format.

Frequently asked questions

Is the source image uploaded?

The normal editor decodes and processes supported images in this browser without uploading them to an application server.

Why can the downloaded image look different?

Check output format, compression, color profile, transparency, dimensions and whether the browser applied orientation metadata.

What are the limits of the blur border effect?

The tool does not extend the scene with generative AI, remove the original background, add a border color or provide manual foreground positioning. A large blur can still reveal broad colors and shapes, so it is not a privacy-redaction method.