Online Batch Image Blur Border Generator

Online Batch Image Blur Border Generator

Batch blurred-frame tool for up to 30 selected images. One shared output width, output height and blur radius is applied to every image. Defaults are 1200 by 630 pixels and 25 px blur; dimensions are constrained to 1..10000 and blur to 0..100, with zero disabling background blur.

For each source, a centered copy is scaled to cover the entire output canvas and forms the blurred background. The blur filter is then cleared, and a second sharp copy is scaled to fit completely inside the same canvas and centered over it. The sharp foreground is not cropped.

Verified geometry: an 800 by 600 source at the default 1200 by 630 output creates a 1200 by 900 cover background positioned at y=-135, then an 840 by 630 sharp foreground positioned at x=180. A portrait in the same batch uses its own aspect ratio, so its band positions differ.

Requested output is proportionally reduced if necessary to stay within 24,000,000 pixels. For example, a requested 10000 by 10000 output is reduced to approximately 4898 by 4898. Every source in the batch receives the same final requested dimensions after this safety scaling.

Each input must have an image MIME type, be at most 25 MiB and decode to at most 24,000,000 pixels. The selected batch is limited to 100 MiB and 40,000,000 decoded source pixels. Successful decoding depends on the browser.

Generate creates one PNG per source and names results frame-1.png, frame-2.png and so on in batch order. Download Result starts separate downloads about 160 ms apart; it does not make a ZIP, retain original base names or offer another output format.

Worked use case: prepare both 4:3 and portrait photos for a 1200 by 630 social preview. The central photo remains fully visible while blurred bands fill unused space. Inspect every result because a high blur still reveals broad colors and shapes and is not privacy redaction.

Processing and previews are local in the browser. Clearing the tool removes selected inputs and stale download state. This effect does not extend the scene with AI or detect subjects. Foreground position and border color are not adjustable; metadata preservation and privacy masking are not guaranteed.