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Use a clip path for a crisp, hard-edged cutout; use a mask when the image needs transparency, a soft fade, or grayscale control. If you are drawing into a canvas already, Canvas 2D clip() fits that pipeline. If the image should stay an HTML or SVG element, CSS clip-path or an SVG clip path is usually the more natural choice.
What is the difference between clipping and masking?
A clip path defines a shape: content inside it remains visible and content outside it is hidden. The result is a hard silhouette, apart from antialiasing along the edge. A mask controls visibility by pixel, allowing intermediate opacity as well as fully visible or hidden areas. That makes masks suitable for soft fades and translucent artwork. The distinction is described in the W3C SVG 1.1 masking and clipping specification.
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In short: clipping answers “inside or outside this shape?”; masking answers “how visible should each part be?”
Which method should you choose?
- Circle, polygon, star, or another crisp cutout: use a clip path. Use Canvas
clip()if the image is being drawn into a canvas; use CSSclip-pathor SVG when it remains an element in the page. - Soft edge, fade, or grayscale transparency: use a CSS or SVG mask, choosing alpha or luminance behavior deliberately.
- Normal HTML structure and interactions: prefer CSS or SVG effects applied to the element rather than drawing it into a canvas. Clipping can also clip clickable areas, so check how it affects links and controls.
- Generated pixels or an existing canvas rendering pipeline: Canvas clipping is a natural fit because it restricts subsequent drawing. That workflow fit does not mean it is universally faster.
MDN notes that clipping may perform better than masking when a basic shape is all that is needed, and that clipping is easier to interpolate. Treat this as qualitative guidance, not a performance guarantee: there is no universal Canvas-versus-DOM/SVG winner established here, so profile the actual workload in the browsers you support.
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How to clip an image on a canvas
Canvas clip() restricts subsequent drawing to the current path, or to a supplied Path2D. A new clip intersects with any existing clipping region. Because clipping changes the canvas drawing state and cannot be directly undone, wrap it in save() and restore().
const ctx = canvas.getContext("2d"" );
ctx.save();
ctx.beginPath();
ctx.arc(100, 100, 80, 0, Math.PI * 2);
ctx.clip();
ctx.drawImage(image, 20, 20, 160, 160);
ctx.restore();The example clips the drawn image to a circle centered at (100, 100) with a radius of 80 canvas units. Ensure the intended geometry is part of the current path: calling fillRect() draws a rectangle but does not add it to the clipping path. To clip to a rectangle, use rect() after beginPath(), then call clip(). Canvas supports the nonzero fill rule by default and also accepts evenodd.
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How to clip an HTML image with CSS or SVG
For an image that should remain an HTML element, CSS clip-path accepts basic shapes and references to SVG <clipPath> elements. For example, a circle can be applied directly in CSS:
img.avatar {
clip-path: circle(50% at 50% 50%);
}SVG effects can also be embedded and referenced from CSS on HTML content. MDN notes that external SVG effect references must be same-origin. See MDN’s guide to applying SVG effects to HTML. If a clipped image contains a link or control, test pointer interaction: the clipped-away area may not remain clickable.
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When a mask is the right tool
CSS mask-image accepts images, gradients, and SVG mask references. Unlike a clip path, a mask can assign partial visibility, which enables gradient fades and soft transitions. The key choice is whether the mask should use alpha or luminance.
- Alpha: visibility follows the mask’s alpha transparency.
- Luminance: visibility follows the mask’s brightness; black and white areas can have different effects even if the SVG appears opaque.
With mask-mode: match-source, ordinary image masks generally use alpha. An SVG <mask> defaults to luminance unless its mask type is set to alpha. Check the intended mode when the result looks faint or inverted. MDN’s mask-image reference documents these behaviors.
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Troubleshoot blank, faint, tiled, or misaligned results
- Canvas content is not clipped as expected: confirm that the shape was added to the current path, and that earlier clipping regions are not narrowing the visible area. Use
save()andrestore()to scope the clip. - A CSS-masked element disappears: check that the mask URL loads, the source has nonzero dimensions, and its format and origin are usable. MDN says an empty, failed, missing, or unsupported mask image is treated as transparent black, which reveals nothing.
- A mask is faint or behaves opposite to expectations: verify whether it uses alpha or luminance, especially for SVG masks.
- A mask repeats or sits in the wrong place: inspect
mask-repeat,mask-size, andmask-position. - An external SVG effect fails: check that the SVG resource is same-origin with the HTML document.
Browser support and compatibility
MDN marks Canvas clip() as widely available, established across browsers since July 2015. MDN’s mask-image reference marks the feature widely available since December 2023, while noting that support for some parts varies. Check the compatibility tables for the specific mask features and browser versions in your target matrix before depending on them: Canvas clip() compatibility and mask-image compatibility.
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