A CSS clip path generator produces a polygon() declaration made of percentage-based coordinate pairs that tell the browser which pixels of an element to paint. With the CSS Clip Path Generator, you select one of eight preset outlines, edit each x% y% vertex in drawing order, preview the result on a real block, and copy a ready-to-use clip-path declaration into your stylesheet or inline style. Each coordinate is a number from 0 to 100 percent, decimals are accepted, and at least three points are required to enclose an area while up to twenty points are allowed for more complex shapes. Because coordinates refer to the element's reference box, the same percentage polygon can stretch across different widths and heights without rewriting the rule. The generator parses your list, validates every pair, and applies the resulting polygon() to a live preview so you can compare shapes, ratios, and vertex order before you ship the CSS.
Behind the scenes, the tool works entirely in the browser. Nothing is uploaded, nothing is retained, and no external library is loaded. You write percentage pairs in a textarea, the script normalizes decimal values, checks each x and y sits between 0 and 100, and emits a string of the form polygon(50% 0%, 0% 100%, 100% 100%) that the live preview uses as a real clip-path declaration. The same string is what you paste into your project. Because the preview is the real CSS property, anything you see is what a browser will paint.
What the Generator Produces
The output of the tool is a single clip-path: polygon(...) value. There are no inline styles, no vendor prefixes, no SVG paths, and no JavaScript dependency. The eight built-in presets cover common decorative shapes so you start from a working outline instead of an empty list.
| Preset | Common use |
|---|---|
| Triangle | Play buttons, call-to-action arrows, banner tips |
| Diamond | Badges, tags, rotated accent blocks |
| Pentagon | Stickers, rating shapes, decorative panels |
| Hexagon | Tessellated grids, technical diagrams, avatars |
| Star | Awards, ratings, festive banners |
| Chevron | Step indicators, breadcrumb separators, banners |
| Message bubble | Tooltips, chat previews, annotation callouts |
| Parallelogram | Slanted labels, sidebar accents, oblique highlights |
Each preset is a known arrangement of percentage pairs that resolves to a balanced outline on a square preview. Once you load a preset, you adjust vertices one at a time to fit your element, brand mark, or visual concept.
Build a Clip Path Step by Step
The workflow below mirrors the verified operating steps and walks you from a blank preview to a copy-ready declaration.
- Choose the preset closest to the shape you need. Pick the entry whose silhouette most resembles what you want to ship. Presets give you a stable starting arrangement rather than an empty list to maintain.
- Edit comma-separated x% y% coordinate pairs in drawing order. Each vertex is an x percentage followed by a y percentage, separated by a space. Commas separate the vertices. Keep every value inside 0 to 100 percent so the polygon stays inside the reference box.
- Check the preview at the intended element aspect ratio. The default preview square can make a star look balanced while the same points on a wide rectangle appear stretched. Resize the preview to match the real container before you lock the values in.
- Copy the declaration and test layout, focus, and responsive behavior. Paste the output into a stylesheet or inline style and confirm the surrounding layout still reserves the original rectangular box, that keyboard focus indicators remain visible, and that touch targets are still reachable on small screens.
Make one coordinate change at a time and watch the preview update. Changing the order of points can produce a different outline even when every coordinate value stays the same, because the browser draws straight segments between consecutive vertices and closes the last back to the first.
How Percentage Coordinates Scale With the Box
Every percentage you enter refers to the chosen geometry reference box. With a basic clip-path and no explicit geometry box, the border box is used by default. A point at 25% 50% sits one quarter of the width across and halfway down the height, regardless of the element's measured size. This is why a square preview can mislead you: a star that looks balanced at 400 by 400 pixels will look stretched on a 1200 by 300 banner even when the percentage list is unchanged.
To see the relationship in numbers, take a point at 25% 50% on a 400 by 300 element. The browser converts it to 25% of 400 = 100 pixels from the left edge and 50% of 300 = 150 pixels from the top. The same 25% 50% on a 800 by 600 element resolves to 200 pixels from the left and 300 pixels from the top. The percentage scales linearly, which is why the visible proportions shift when the aspect ratio changes.
Because coordinates are relative, the same polygon() value can drive a thumbnail on mobile and a hero panel on desktop without rewriting the rule. You only need to retune vertices when you switch aspect ratios significantly, and the generator's preview is the easiest way to confirm the new shape still reads correctly.
Reading Point Order and Closed Polygons
The browser draws a polygon by walking the vertices in the order they appear in the list. It connects vertex one to vertex two with a straight segment, vertex two to vertex three, and so on, and it closes the path by joining the last vertex back to the first. There is no need to repeat the starting point at the end of the list. Changing the order can produce a different outline even when the same coordinates are present, and concave shapes such as the star or chevron are deliberately written so that the inward folds create the recognizable silhouette.
Self-intersecting polygons can have surprising fill results, so the generator validates syntax and bounds but does not claim every point order is visually useful. If a shape looks wrong, try reversing the order before adjusting values. The fact that polygons close automatically also means that the final visible edge is drawn between the last vertex and the first, not between the last vertex and an extra repeated point.
Layout, Focus, and Performance Notes
Clipping is purely a paint operation. Content outside the clipping region is hidden, but the element still occupies its original rectangular layout box, so surrounding elements are unaffected. This is a useful property for decorative silhouettes on images, but it also means a clipped corner can reduce the visible or interactive area of a control. Do not clip away essential text, keyboard focus indicators, or touch targets. For images, preserve meaningful alternative text. For controls, test pointer and keyboard behavior carefully and avoid using a decorative silhouette as the only signal of purpose.
Performance considerations matter too. A visually clipped image still downloads at its original dimensions, so the same 4000-pixel-wide photograph will be requested on a 400-pixel-wide phone unless you also serve a smaller file. The clip-path declaration itself is cheap to render, but the asset behind it is not, so pair the shape with appropriately sized sources. Because generation is fully client-side, the tool itself adds no dependency to your page; it only helps you serialize a valid polygon, and design quality, accessibility, and performance still require testing in the final page.
Browser Support and Fallback Strategies
The clip-path property with polygon() values is widely supported in current evergreen browsers, including Chrome, Edge, Firefox, and Safari. Older versions and some niche engines may not recognize the property at all. When the silhouette is nonessential, provide a sensible rectangular fallback by leaving the element unstyled on the property, since the unstyled rendering is the natural fallback. When the silhouette carries meaning, prefer a method that survives missing support, such as masking with an SVG or supplying an alternate asset.
Animating between polygons generally works best when both shapes have the same number of vertices in compatible order. If you plan to morph one outline into another, keep the vertex count constant and adjust one point at a time. Animating between incompatible outlines can cause the browser to fall back to discrete steps, which often looks jarring. For authoritative guidance on the property's grammar and reference box behavior, consult the MDN clip-path reference; the W3C CSS Shapes Module defines how percentage coordinates resolve against the reference box.
For designers who want to combine polygon clips with related visual treatments, the guide to CSS speech bubbles without images shows how a similar polygon technique can produce tail-based callouts. Each tool serializes a single, narrowly scoped declaration, so they compose without conflicting rules.