Image Rounded Corners
Apply custom corner radiuses, circular avatar masks, and border outlines to images 100% locally in your browser.
Images are read directly into browser memory using HTML5 File APIs. No data leaves your machine.
Drag & drop images to begin
Select or drag multiple images from your device. Entirely processed locally in your browser memory.
In-Browser Anti-Aliased Corner Rounding and Circle Mask Studio
The Image Rounded Corners utility applies smooth anti-aliased corner curves, circular avatar cutouts, and concentric outline border strokes to digital images directly inside your web browser. Utilizing client-side HTML5 Canvas 2D path clipping operations and sub-pixel vector rasterization, the tool shapes image perimeters without transmitting graphic files to external cloud servers.
Corner rounding is a foundational technique in modern graphic and user interface design, transforming sharp rectangular screenshots into polished software cards, dialog window mockups, and circular profile avatars. The workspace supports both linked uniform radius scaling and independent four-corner geometry (Top-Left, Top-Right, Bottom-Right, and Bottom-Left) from 0px to 200px, as well as a single-click 50% circle masking preset.
When clipping curved perimeters, the engine maintains 8-bit alpha channel transparency in PNG and WebP formats so assets blend directly over web backgrounds. Alternatively, users can composite outer clipped corners against solid matte backgrounds (white, dark neutral, or custom hex codes) or render concentric border strokes with customizable stroke widths and colors.
Core Tool Capabilities
- Uniform and Independent Corner Radii: Link all four corners for uniform curvature or adjust Top-Left, Top-Right, Bottom-Right, and Bottom-Left radii independently.
- Single-Click Circle and Avatar Masking: Transform square or rectangular photos into perfect circular or elliptical avatar cutouts with smooth sub-pixel anti-aliased perimeter clipping.
- Alpha Transparency and Solid Color Matting: Retain clean transparent backgrounds outside curved corners in PNG/WebP or composite against solid matte colors (White, Black, or Custom Hex).
- Concentric Outline Border Frames: Render clean concentric outline border strokes around curved corners with adjustable stroke width and custom color picker selection.
- Interactive Split Comparison Studio: Compare straight-edge source files with rounded outputs side-by-side or using an interactive draggable split-slider divider.
- Queue-Based Batch Processing and ZIP Export: Queue multiple image assets, apply uniform corner styling across the entire batch, and download individual files or a single bundled ZIP archive.
Local Browser Privacy
Your files are processed locally on your device. Files are not uploaded, transmitted, or stored on remote servers.
Once the page has loaded, you can disconnect your network connection and continue using this tool offline.
Target Use Cases
- • User Avatars and Profile Pictures
- • UI Mockups and Website Card Media
- • Social Media Promo Cards and Badges
- • Presentation Slides and Video Graphics
Technical Specifications & Platform Limits
Decodes standard web formats, vector graphics, and high-resolution camera photos.
Preserves 8-bit alpha transparency for curved corners or composites onto solid matte.
Supports subtle UI card rounding to complete circular avatar cuts.
Sub-pixel vector path clipping ensuring smooth, non-jagged corner edges.
Guarantees reliable browser memory management during high-resolution path clipping.
Executes locally inside your browser with no file upload required.
Step-by-Step Workflow
Import Source Images
Drag and drop one or more images into the workspace drop zone or select files from your local storage.
Configure Corner Radii or Circle Mask
Slide the corner radius controller, choose a quick preset (Card, Smooth, Pill), or click the Circle Mask button for avatar cuts.
Set Background Matting and Border
Select transparent alpha or a solid matting color, and optionally add a sleek outline border around the curved perimeter.
Export Rounded Graphics
Inspect the final composition in the split comparison studio, then download individual files or export the full queue packaged in a ZIP archive.
Practical Real-World Use Cases
User Avatars and Profile Pictures
Software developers and web creators converting rectangular portrait photos into circular PNG avatars for user profile badges, author bios, and team directories.
UI Mockups and Website Card Media
UI/UX designers softening screenshot edges with 16px to 24px radii to match modern operating system window aesthetics and design system components.
Social Media Promo Cards and Badges
Marketing specialists creating pill-shaped product badges, app store screenshots, and matted graphic stickers for promotional campaigns.
Presentation Slides and Video Graphics
Educators and presentation authors rounding slide diagrams and illustration corners to create a modern, polished visual layout.
Frequently Asked Questions
- How do I save an image with transparent rounded corners?
- Set your Output Format to PNG or WebP and ensure the Background Matting option is set to Transparent. The JPEG format does not contain an alpha channel and will fill curved corner regions with a solid color.
- Can I round only specific corners on an image?
- Yes. Toggle the Linked button off to switch into Independent Corners mode. You can then specify distinct pixel radii for Top-Left, Top-Right, Bottom-Right, and Bottom-Left corners, allowing you to create tab shapes or asymmetric card headers.
- What does the Circle / Avatar Mask option do?
- The Circle Mask option clips the source image to a 50% radius oval or circle centered within the frame. When applied to a square image, it generates a perfectly circular avatar cutout.
- How does the outline border handle curved corner geometry?
- The stroke engine calculates concentric inner and outer vector curves to ensure the border stroke thickness remains completely uniform across straight edges and rounded corners.
- Are my uploaded photos sent to an external server?
- No. All canvas path clipping, color matting, and ZIP export operations execute locally in your browser memory without file uploads.
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Master this tool with Guides & Articles
Learn the workflows, common mistakes, and advanced techniques behind Image Rounded Corners - Soften Photo Edges and Create Circles with our deep-dive educational content.
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