UI Builder – Mockup Tool

UI wireframes in Chrome. Drag sketch-style elements, resize, and screenshot easily.

UI Builder – Mockup Tool is a fast Web Wireframe & Web Design Tool that lets you sketch UI layouts on any live page or on a new blank page. Quickly show clients possible design changes directly on the live website, without switching tools. 🔵 Built for designers, product owners, developers and business analysts who need instant mockups without leaving the page. Drag-and-drop hand-drawn widgets, resize them smoothly, edit text in place, snap a quick screenshot, and share — all 100 % locally in your browser for rapid prototyping. 🔹 Instant wireframes – turn any site (or a blank canvas) into a playground for mockups 🔹 True WYSIWYG – change button labels, headers and colours right on the screen 🔹 Keyboard friendly – Ctrl/⌘ + C/V to duplicate, Delete to remove, Esc to cancel 🔹 Pixel-perfect exports – save the selected area as PNG or copy a screenshot to clipboard 🔹 Privacy first – no network calls, analytics or trackers; data lives in chrome.storage.local 🔹 Lightweight – injected only on demand, keeping everyday browsing fast 1️⃣ Install & pin the toolbar icon 2️⃣ Click UI Builder – the palette appears 3️⃣ Drag widgets (buttons, headers, inputs, frames, dividers…) onto the page or blank canvas 4️⃣ Resize / recolour until it looks right 5️⃣ Press the disk icon, draw a marquee, confirm ✓ – get your PNG or paste straight to Slack / Figma / Jira Perfect for: 🔹 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 specs and tickets 🚀 Add "UI Builder – Mockup Tool" Chrome extension today and start wireframing the web in one click!