Create professional 4:3 presentation mockups for free. Easily frame your design screenshots with custom backgrounds, shadows, and clean layouts for your portfolio.
AI Generation Prompt
4:3 Presentation Canvas Specification
Overview
A high-performance, single-file browser utility designed to help designers create 4:3 aspect-ratio mockups for portfolio presentations. The app focuses on a "what you see is what you get" (WYSIWYG) editing experience.
Core Features
- Image Upload: Drag-and-drop or file-picker support for JPG/PNG/WebP.
- Canvas Control: Fixed 4:3 ratio container that remains responsive regardless of viewport size.
- Background Engine: A robust background picker offering solid colors, modern linear gradients, and subtle noise patterns.
- Shadow Customization: Fine-grained control over shadow intensity, blur radius, and spread for a "premium" depth effect.
- Padding Control: Adjustable inner-padding to provide "breathing room" between the uploaded asset and the canvas edge.
- Export: One-click generation of the final composition as a high-resolution PNG using the HTML5 Canvas
toDataURLmethod.
Technical Implementation (Single-File Architecture)
- Frameworks: Pure Vanilla JS. Tailwind CSS (via CDN) for styling.
- Storage: Explicitly NONE. No
localStorage,sessionStorage, or IndexedDB. State is managed entirely in a volatile JS object. - Security: Sandbox-ready. The application must function without requiring permissions or external API calls.
- Rendering: Uses the HTML5 Canvas API for final image composition to ensure pixel-perfect fidelity.
UI/UX Design System
- Aesthetic: High-contrast, clean, light-mode palette.
- Primary Background:
#F8FAFC(Slate 50) - Card/Control Surface:
#FFFFFF(White) with a subtle, soft drop shadow (0 4px 6px -1px rgb(0 0 0 / 0.1)). - Accents: High-visibility primary blue for buttons (
#2563EB).
- Primary Background:
- Interactions:
- Hover effects on buttons with smooth CSS transitions (
transition-all duration-200). - Subtle input validation feedback (e.g., changing border color on focus).
- Hover effects on buttons with smooth CSS transitions (
- Responsive Strategy:
- Desktop: Sidebar controls (left) + Canvas Preview (right).
- Mobile: Stacked layout (Controls on bottom, Preview on top).
Layout Specification
- Header: Minimalistic navigation bar with a clear title and a "Clear Canvas" action button.
- Main Workspace: A split-pane view.
- Left Sidebar: Grouped control sections (Background, Shadow, Export).
- Right Stage: The central canvas container, vertically and horizontally centered, with a distinct checkerboard pattern (optional) to represent transparency.
- Modals: Custom HTML overlays for alerts/instructions (e.g., "Image uploaded successfully"). No browser alerts allowed.
Developer Directives
- No External Dependencies: Only use CDN links provided by authorized providers.
- Iframe Safety: Ensure no code attempts to access
window.topor cross-origin resources. - Performance: Debounce all slider inputs for background/shadow changes to prevent UI lag while dragging.
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Files being used
Frequently Asked Questions
Everything you need to know about using this application.
How does this 4:3 mockup tool work?
This tool utilizes your browser's native Canvas API to render presentation mockups entirely on your local machine. You simply upload your design screenshot, select a background color or gradient, choose a frame style, and adjust the drop shadows to your preference. Once satisfied with the visual arrangement, you can click the download button to export your composition as a high-resolution PNG image. The entire process happens in your web browser, ensuring that your original files are never uploaded to a server or stored remotely.
Is this mockup presentation tool really free?
Yes, this application is completely free to use with no hidden fees, subscriptions, or account requirements. Our goal is to provide a utility that helps designers quickly create polished, professional-grade portfolio shots without the need for expensive software or complex design suites. We believe that high-quality design presentation should be accessible to everyone. By utilizing pure client-side processing, we eliminate server costs, allowing us to keep this tool available as a permanent, free utility for the design community.
Can I save my projects or save my progress?
Because this tool is designed as a secure, privacy-focused utility, it does not use cookies, local storage, or server-side databases. This means that if you refresh your browser window or close the tab, your current work and settings will be reset to the default state. To ensure you do not lose your progress, we recommend downloading your generated mockup as soon as you are happy with the result. We prioritize user privacy and security by ensuring that no data is persisted beyond the current browser session.
What formats can I upload and download?
You can upload standard web image formats, including JPEG, PNG, and WebP, directly into the canvas area. The tool automatically handles the resizing and positioning to fit the required 4:3 aspect ratio, ensuring your design is displayed clearly within the frame. When you export your project, the tool generates a high-quality PNG file. This ensures maximum compatibility with other design tools, social media platforms, and portfolio websites, giving you the crispest possible output for your presentation needs.
