Round Image Corners Online Free — Circular Avatar & Border Maker

Overview: Create rounded cards, circular avatars, and bordered image assets easily.

Apply rounded corners, circular avatar clipping, and customizable colored borders to photos with transparent PNG export. All computations and data processing are executed 100% locally on your device using client-side WebAssembly, HTML5 Canvas, and modern Web APIs without uploading files to any external server.

Supported Formats

Image Border & Rounded Corners supports the following file formats:

  • JPG — client-side processing support.
  • PNG — client-side processing support.
  • WebP — client-side processing support.

How to Use Image Border & Rounded Corners in Browser

  1. Upload Image: Upload your square or rectangular picture.
  2. Customize: Adjust the corner radius slider, toggle circular avatar mode, and set border width/color.
  3. Download: Click 'Download Rounded PNG' for transparent, anti-aliased output.

Key Features & Privacy Protections

  • 100% Client-Side Privacy: Zero cloud upload. Your documents, photos, and files never leave your local browser sandbox.
  • Zero Installation: Runs instantly in Chrome, Safari, Firefox, Edge, Android, and iOS browsers.
  • Free Forever: No sign-up, no subscriptions, no ads, and no file size limits.

Frequently Asked Questions (FAQ)

Does the output support transparent corners?

Yes, rounded corners are clipped cleanly and saved as transparent alpha channels in PNG format.

Can I create 1:1 circular profile avatars?

Yes, click 'Make Circle / Avatar' to center-crop the photo into a flawless circle.

Can I add background canvas padding?

Yes, adjust the frame padding slider and pick transparent or custom solid background fill.

Are edges smooth and anti-aliased?

Yes, the HTML5 Canvas clipping engine renders crisp, anti-aliased rounded edges at original image resolution.

Gallery

Image Border & Rounded Corners

100% Private (Client-Side)•Zero Server Upload

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v1.0.0Free · Canvas roundRectImage Tools

Round Image Corners Online Free — Circular Avatar & Border Maker

Create rounded cards, circular avatars, and bordered image assets easily.. Apply rounded corners, circular avatar clipping, and customizable colored borders to photos with transparent PNG export.

What is Rounded Corners and what does it do?

The Image Border & Rounded Corners tool is a visual styling utility that rounds picture corners, generates circular profile avatars, and adds colored outer borders with transparent PNG export.

Perfect for web designers and app developers needing rounded card assets or circular profile icons without firing up heavy desktop photo editing software.

  • Apply smooth rounded corners with adjustable pixel radius sliders (0px to 200px).
  • One-click 'Make Circle / Avatar' toggle to center-crop any photo into a 1:1 circular profile icon.
  • Customizable border outline with adjustable stroke thickness (0px to 30px) and full-spectrum color picker.
  • Add outer canvas padding and select transparent or solid background framing.
  • Exports clean, anti-aliased transparent PNG files compatible with modern web design systems.

How does Rounded Corners work?

The image is loaded into an HTML5 Canvas matching the requested dimensions and padding offsets. The canvas 2D context executes a clipping path using roundRect or arc commands.

The image bitmap is drawn within the clipping path to achieve anti-aliased curved boundaries. Any requested border stroke is traced along the boundary path before exporting as a transparent PNG.

100% private: all processing happens locally in your browser using client-side WebAssembly, HTML5 Canvas, and modern Web APIs. Your files are never uploaded to any server.

Who needs Rounded Corners?

Web Designers & Frontend Engineers

Create rounded thumbnail graphics, app card imagery, and circular avatar assets for web applications.

Community & Forum Users

Crop personal photos into circular avatar icons for Discord, Slack, GitHub, and social media profiles.

Ecommerce Sellers & Merchants

Apply uniform rounded corners and stylish accent borders to product catalog images and banners.

Content Creators & Influencers

Add custom colored borders and rounded photo frames to YouTube thumbnails and presentation graphics.

Supported file formats

Image Border & Rounded Corners processes the following file extensions and data formats directly in your browser:

JPGPNGWebP

How to use Rounded Corners — step by step

  1. 1

    Upload Image

    Upload your square or rectangular picture.

  2. 2

    Customize

    Adjust the corner radius slider, toggle circular avatar mode, and set border width/color.

  3. 3

    Download

    Click 'Download Rounded PNG' for transparent, anti-aliased output.

Frequently asked questions

Does the output support transparent corners?

Yes, rounded corners are clipped cleanly and saved as transparent alpha channels in PNG format.

Can I create 1:1 circular profile avatars?

Yes, click 'Make Circle / Avatar' to center-crop the photo into a flawless circle.

Can I add background canvas padding?

Yes, adjust the frame padding slider and pick transparent or custom solid background fill.

Are edges smooth and anti-aliased?

Yes, the HTML5 Canvas clipping engine renders crisp, anti-aliased rounded edges at original image resolution.

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