UI Builder - Mockup tool

Sketch UI wireframes directly on any webpage in Chrome

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Added Jul 2026

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What is Ui Builder Mockup Tool?

UI Builder is a Chrome extension for creating wireframes and mockups directly on live websites or blank canvases. Using drag-and-drop sketch-style elements, users can quickly design UI layouts, resize components, edit text in-place, and export screenshots without leaving the browser. Built for designers, product owners, developers, and business analysts who need rapid prototyping with privacy-first, local-only storage.

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Key Features of Ui Builder Mockup Tool

Drag-and-drop widget insertion (buttons, headers, inputs, frames, dividers)
In-place text editing and color customization
Smooth resizing with keyboard shortcuts
Pixel-perfect PNG export with marquee selection
Screenshot to clipboard functionality
True WYSIWYG editing
Local browser storage (no cloud)
Privacy-first with no tracking or analytics
Lightweight injection for fast browsing
Keyboard shortcuts (Ctrl/Cmd+C/V, Delete, Esc)
Support for 30 languages

Who Should Use Ui Builder Mockup Tool?

Quick idea sketching before opening heavy design tools

Annotating client websites during live calls

Teaching web design basics without extra software

Creating product screenshots for specifications and tickets

Prototyping design changes directly on live websites

Ui Builder Mockup Tool: Pros & Cons

✓Pros

No heavy design software needed
Instant feedback on live websites
Local storage ensures privacy
Keyboard-friendly interface
Lightweight and doesn't slow down browsing
Supports multiple languages (30 total)
Free to use

Frequently Asked Questions about Ui Builder Mockup Tool

What is UI Builder – Mockup Tool?

UI Builder is a Chrome extension that lets you create wireframes and mockups directly on any live website or blank canvas using drag-and-drop sketch-style elements.

Do I need to install design software to use it?

No, UI Builder runs entirely in your Chrome browser, so you don't need Figma, Adobe, or other design tools to create quick mockups.

Is my data stored in the cloud?

No, all your work is stored locally in Chrome's local storage with no network calls, analytics, or trackers.

How do I export my mockup?

You can save the selected area as PNG, copy screenshots to your clipboard, or paste directly into Slack, Figma, or Jira.

Who is this tool designed for?

UI Builder is built for designers, product owners, developers, and business analysts who need fast prototyping without switching tools.