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A browser-based css border-image slice visualizer tool. No data sent to server.

📘 How to Use

  1. Upload a border image file
  2. Adjust the nine-slice guides by dragging them or entering pixel values
  3. Configure the repeat mode, fill, and border scale options

CSS Border-Image Slice Visualizer

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Click to select or drag & drop

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Slice Editor

Please upload an image
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Preview

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Output CSS
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Article

CSS Border-Image Slice Visualizer｜Interactive 9-Slice Generator & Preview Tool

This tool is for web designers and front-end developers who want to visually generate and preview the CSS border-image property. Instantly create scalable, resolution-independent component borders without the guesswork of manual coding.

💡 Tool Overview

  • Interactive Slice Editor: Drag the slice guides directly on your image or enter precise pixel values for the top, right, bottom, and left cuts.
  • Real-time Preview: See how your border image behaves on a resizable container instantly, providing immediate feedback on your adjustments.
  • Complete Control: Switch between stretch, repeat, and round modes to control how the edge pieces tile and scale.
  • Advanced Options: Toggle the fill property to render the center slice and use the scale slider to adjust the border-width dynamically.
  • Ready-to-use Code: Get the generated CSS snippet, including border-image-slice, border-width, and border-image-repeat, ready to copy into your project.
  • Privacy First: Your image data is processed entirely in your browser. No files are ever uploaded to a server.

🧐 Frequently Asked Questions (FAQ)

Q. What is the border-image property used for?

A. It allows you to use an image as a border for an element, replacing the standard solid/dashed line styles. The image is sliced into nine sections (four corners, four edges, and a center), which are then used to construct the border. This enables complex and scalable border designs like custom frames, speech bubbles, and textured backgrounds that adapt to any element size.

Q. Can I use SVG images with this tool?

A. Yes. The tool accepts any standard image format supported by your browser, including PNG, JPEG, GIF, and SVG. Using SVG is a great practice for creating resolution-independent, sharp borders that look crisp on any screen.

📚 Fun Facts about CSS Border-Image

The concept behind border-image is known as "9-slice scaling" or "9-patch," a technique that has long been a staple in game development and mobile app UI design. It allows developers to create scalable UI elements like buttons and panels from a single, small texture image, saving memory and ensuring crisp visuals at any size. The CSS border-image property brings this powerful graphics technique directly to the web platform, enabling more creative and performant designs without relying on multiple images or complex DOM structures.