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CSS Speech Bubble Generator

Build a CSS speech bubble with validated colors, radius, tail size, and four tail directions, then copy the complete pseudo-element rule.

Privacy: your files never leave your device. All processing happens locally in your browser.

How to use

  1. 1.Choose bubble and text colors.
  2. 2.Set the corner radius and triangle tail size.
  3. 3.Select top, right, bottom, or left and inspect the preview.
  4. 4.Copy the CSS and add content layout, semantics, contrast, and responsive spacing.

About CSS Speech Bubble Generator

CSS Speech Bubble Generator creates a rounded message surface and a triangular pointer without an image or SVG asset. Select the bubble and text colors, corner radius, tail size, and one of four tail sides. The result includes a relatively positioned base class and an absolutely positioned ::after pseudo-element. The live preview draws the same border triangle as a real child element because inline styles cannot target pseudo-elements, while the copied rule expresses the production form. Both paths use the same validated size, color, side, and offset calculation.

The triangle technique starts with a zero-width, zero-height box. Adjacent borders receive transparent colors and the border opposite the chosen side receives the bubble color. For a bottom tail, left and right borders are transparent while the top border is colored; the element is positioned below the box and centered horizontally. Top reverses the colored border. Left and right tails use transparent top and bottom borders and center vertically. The generator writes explicit declarations so the geometry remains understandable when inspected in developer tools.

Tail size controls both the visible projection and half of the triangle base. It is limited to a practical four through forty pixels. Corner radius accepts zero through eighty pixels. Colors must be complete six-digit hexadecimal values, and empty numeric controls are rejected rather than converted to zero. The tail is centered on its selected side; custom offsets, multiple pointers, curved tails, outlines, and drop shadows are intentionally outside this focused output. After copying, adjust the fifty-percent position if the pointer should align with an avatar or anchor.

A decorative pointer does not establish a semantic relationship. Use appropriate HTML for the content: a paragraph for a quote, a list item for a message, or a tooltip pattern only when its interaction and accessibility requirements are satisfied. Do not turn the generated box into a tooltip merely by adding a tail. Interactive tooltips need keyboard reachability, predictable dismissal, focus behavior, and an accessible association with their trigger. Chat messages should expose author, order, status, and timestamps in text rather than relying on left or right placement alone.

Check contrast between text and the selected background. The generator does not calculate WCAG ratios, and a visually pleasing bubble can still be unreadable. Long unbroken strings, translated copy, zoom, and narrow mobile widths may expand the box or collide with the tail. Give the production component a sensible maximum width, wrapping rules, padding, and enough outer space on the tail side. If the bubble sits inside an overflow-hidden parent, the pointer can be clipped. Reserve space and inspect every responsive breakpoint.

All calculation happens locally and deterministically. Nothing is uploaded or retained, no account is needed, and no new dependency is introduced. The copied CSS intentionally omits content, padding, width, typography, animation, and interaction logic because those belong to the component using the shape. After copying, integrate existing tokens, test semantic reading order, keyboard behavior where relevant, contrast, high-contrast modes, zoom, localization, overflow, and the exact container that will host the pointer.

Methodology & sources

Validates two six-digit colors, finite radius and tail bounds, maps each selected side to the opposite colored border, and serializes a zero-size CSS triangle with centered absolute positioning while previewing the same geometry.

Frequently asked questions

Why does the copied rule use ::after?
A pseudo-element adds the triangle without extra production markup. The preview uses a child only so the same geometry can be shown with inline styles.
Can this be used as an accessible tooltip?
The shape alone is not a tooltip implementation. Add trigger association, keyboard access, focus and dismissal behavior, and suitable semantics.
Why is the tail clipped in my layout?
An ancestor may use overflow hidden or provide too little outer space. Inspect the containing blocks and reserve room on the selected side.

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