Online Batch Image Rounded Corners Tool
Batch process multiple images: generate transparent rounded corners. Processing takes place locally in your browser.
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Online Batch Image Rounded Corners Tool
The batch page loads up to 30 browser-decodable images by multiple selection or drag and drop, with limits of 25 MiB and 24,000,000 decoded pixels per image and 100 MiB and 40,000,000 decoded pixels per batch.
Corner radius ranges from 0 to 1000 pixels and defaults to 40. Margin ranges from 0 to 1000 pixels and defaults to 0. Background can be transparent, selected by default, or a solid color chosen with the color input.
The canvas size is source width plus twice the margin by source height plus twice the margin. The effective radius is capped at half the source width or height, and the image is clipped to that rounded rectangle inside the margin.
For a 400 by 300 image with 20-pixel margin, the result is 440 by 340. A requested radius above 150 is capped at 150 for that source. Transparent background retains transparent outside corners; solid mode fills the full canvas before clipping the image.
Every result downloads separately as PNG ending in -round.png, which supports transparency. There is no ZIP, border stroke, per-corner radius, metadata retention or animation preservation. Rendering stays in the browser.
Use an integer margin for even padding. Fractional input is accepted, but final dimensions are floor(source width+2*m) × floor(source height+2*m), where m is the margin in pixels. Fractional margins may produce unequal edge spacing and resampling. Final outputs, including margins, are limited to 24 million pixels each and 40 million per batch; equality is allowed and exceeding either rejects the complete batch before output allocation.
3×2 px; m=0.75 → 4×3 px
Per image: ≤25 MiB and ≤24,000,000 pixels. Per batch: ≤100 MiB and ≤40,000,000 pixels. Selecting over 30 files or any invalid image rejects the whole batch.
Processing takes place locally in your browser.