Are my images uploaded to a server?

No. Everything runs in your browser, so the image never leaves your device and nothing is stored on a server.

Rounded Corners

Soften an image with rounded corners.

Runs in your browser, nothing is uploadedFree, no signupNo watermark

Drop an image here

or click to choose one. It never leaves your device.

Before and after

See what changes

Six Thridy 3D food icons arranged on a warm gradient background — Baked into the file rather than applied in CSS, so the rounding survives being emailed, dropped into a deck or uploaded somewhere that ignores your stylesheet.

Baked into the file rather than applied in CSS, so the rounding survives being emailed, dropped into a deck or uploaded somewhere that ignores your stylesheet.

Drag the handle across the image. The right-hand side is this tool's output, not a mock-up of it.

Before: Square corners
After: Rounded

Three steps

How to use the rounded corners

01
Add your image
Drop in the image whose corners you want softened.
02
Set the radius
Slide from a slight softening to a full pill or circle, with a live preview.
03
Save as PNG or WebP
The cut corners are transparent, so the format has to support an alpha channel.

Why this one

What makes it different

Real transparency at the corners

The corners are cut to alpha rather than filled, so the image sits on any background colour without a visible square.

Radius you can see as you set it

Corner radius is entirely a judgement call, so it is a live preview rather than a number you guess and re-export.

Baked in, so it survives

A CSS radius disappears the moment the image is used somewhere without your stylesheet. Baking it into the file means it travels.

Where it runs: Your browser, not a server
Uploads: None, ever
Account: Not required
Watermark: Never added

The short version

About rounded corners

Rounded corners are the most quietly load-bearing detail in modern interface design, and the moment an image leaves your own page they stop being a stylesheet property and start being something the file has to carry itself. Emails, decks, marketplaces and app previews all show your image exactly as it was saved, which is when a baked-in radius earns its keep.

Questions

Rounded Corners FAQ

Why not just use CSS border-radius?

Use CSS when you control the page. Bake it into the file when you do not: an email client, a slide deck, a marketplace listing or an app that shows your image raw will ignore your stylesheet entirely.

Why are my rounded corners white instead of transparent?

The file was saved as JPG, which has no alpha channel and fills the cut area with white. Export as PNG or WebP.

What radius should I use?

Between two and five percent of the image width reads as a soft modern corner. Beyond about fifteen percent it starts to read as a deliberate pill shape rather than a subtle rounding.

Does the radius scale if I resize the image later?

No. It is baked into the pixels, so resizing scales the visible corner with everything else. Round after resizing if you need an exact corner size.

Free, and staying free

The tools are free because the icons are the business.

Thridy is a library of thousands of 3D icons in one consistent style, free for commercial use with no attribution and no account. The tools exist so you never have to upload an image to somebody else's server to resize it.

Browse the icons Request an icon

Keep going

Image Resizer

Resize to exact dimensions or a preset for any platform.

Image Cropper

Crop freehand or lock to a ratio like 1:1 and 16:9.

Circle Crop

Cut an image into a perfect circle with transparent corners.

Rotate Image

Turn an image by 90 degrees or any custom angle.

Flip Image

Mirror an image horizontally or vertically.

Add Border

Frame an image with a solid border in any colour.

All tools