How To Round İmage Corners
📖 Bu rehber ToolPazar ekibi tarafından hazırlanmıştır. Tüm araçlarımız ücretsiz ve reklamsızdır.
CSS radius versus baked-in corners
You need baked-in corners when the consuming environment strips CSS (email clients like Outlook), renders outside a browser (office docs, messaging apps), or needs a true image file with an alpha channel (PNG/WebP with transparent corners).
Radius in pixels versus percent
If you’re going to paste a circular avatar onto an unpredictable background, always export PNG or WebP. If you know the placement background is solid white and unchanging, JPEG with white corner fill works and saves bytes.
Going full circle: 50% radius
Transparent rounded corners require an alpha channel. Your format options:
Transparency: PNG, WebP, AVIF
JPEG is simply not an option for transparent corners; it has no alpha channel.
Anti-aliasing the curve
A round corner against a transparent background needs anti-aliasing: partially-transparent pixels along the curve edge so it doesn’t look jagged. Good tools do this by default; bad ones produce a stair-step edge that’s obvious at small sizes.
Picking a radius for the job
If your exported image shows visible jaggies, check whether the tool is exporting at the target size or at a reduced size and then letting the browser scale up. Rendering at the final size with anti-aliasing on gives the cleanest curve.
Individual corner radii
Not all corners need the same radius. A common pattern for photo-text cards is to round only the top two corners (where the photo is) and leave the bottom square so the text section below aligns cleanly. The CSS:
Elliptical (non-circular) corners
For baked-in asymmetric corners, pick a tool that exposes all four corner radii individually.
Shadows and rounded corners together
A border radius can actually accept two values per corner: one for the horizontal curve, one for the vertical curve, producing an elliptical corner. In CSS:
Batch rounding
Elliptical corners are rare in baked image form but useful for distinctive brand shapes or large hero images that shouldn’t look like they have an identical curve to every card on the page.
Safe padding for drop-in placement
For product catalogs, team photo galleries, or icon sets, batch tools round hundreds of files with the same radius in one pass. Useful options to look for: maintain aspect ratio, choose output format per file, add a transparent padding around the rounded shape to prevent cropping when the image is pasted.
Accessibility implications
When you export a rounded-corner image that will be pasted into another composition, add a few pixels of transparent padding around the shape. This prevents the edge of the rounding from touching the container border awkwardly and gives you wiggle room for alignment.
Email clients and rounded corners
The padded version still reads as 500 px but gives downstream editors a clean drop-in asset.
Mask versus crop
Heavy rounding on buttons and interactive elements can hurt perceived tappability for some users — the shape starts to resemble decorative elements rather than controls. Design conventions suggest 4–8 px radius for interactive elements so they still read as “tappable thing,” even if the rest of your design uses 16+ px.
Rounding ratio across sizes
For users with cognitive or motor accessibility needs, consistent shape language across buttons matters: a button with 16 px radius, a card with 16 px radius, and a pill-shaped tag can all live together, but buttons shouldn’t vary randomly between radii in the same interface.