NodlumeFree HTML wireframe designer for web page layouts and UI components
A free online wireframe tool for HTML layouts — no account needed. Add phone, tablet and desktop screens at real screen sizes, drag pre-built headings, text, buttons, inputs, images and boxes onto them, and pull repeated pieces into shared components: the master lives on the canvas next to your screens, and every placed instance follows it live. Sketch one web page or a whole flow of user interfaces side by side, and your wireframe is saved in this browser as you draw.
Reusable UI components, the Figma way
A shared component is a real frame on the canvas, not a hidden template. Move a button inside the master, retype its label, resize the frame — every instance on every screen repaints immediately, because instances render the master, they never copy it. It is the one primitive design systems and team libraries are built on, without the setup.
Wireframes, not markup
The element vocabulary is basic HTML — headings, text, buttons, inputs, images, boxes, links, dividers — but the tool draws the layout and stops there. Deciding structure and user experience before writing any markup is the part worth doing on a canvas, and it is where design tools save time over editing code.
Yours as JSON
Download or copy the whole board as a plain JSON document — screens, elements, components and instances with their positions and sizes — readable by scripts, other tools, or an AI agent implementing the layout. Your design work leaves with you.
HTML wireframes, answered
- What is an HTML wireframe?
- An HTML wireframe is a low-fidelity sketch of a web page's layout drawn with the vocabulary of basic HTML — headings, text blocks, buttons, inputs, images, boxes, links and dividers — before any markup or styling exists. It answers where things go and how screens relate, which is cheaper to decide on a canvas than in code. Settling that early is how wireframing saves time: a layout mistake caught here costs a drag, not a refactor. This tool draws the wireframe and stops there: no generated HTML to fight with afterwards.
- How do shared components work?
- The same way Figma components do. A component master is a real frame that lives on the canvas next to your screens. Put elements in it, then place instances of it on any screen. Instances render the master rather than copying it, so moving an element, retyping a label or resizing the master updates every instance on every screen immediately. Deleting the master removes all of its instances.
- Is this wireframe tool really free? Where is my work saved?
- Yes — free, with no account and no sign-up. Everything runs in your browser, and your wireframe is saved to this browser's localStorage as you draw, so it is there when you come back. The export is a plain JSON document of your screens, elements, components and instances — readable by scripts, other tools, or an AI agent implementing the layout.
- Can I wireframe mobile and desktop layouts side by side?
- Yes. Screens come in phone (390×844), tablet (768×1024) and desktop (1280×800) presets, and any number of them can sit on the same canvas side by side. A shared component placed on all three keeps the repeated pieces — a navbar, a footer, a card — identical across breakpoints while each screen's own layout differs, so the responsive behaviour of one web page is visible in a single view.
- What screen sizes and aspect ratios should I wireframe at?
- The three presets cover the aspect ratios that matter: phone at 390×844 (roughly 9:19.5), tablet at 768×1024 (3:4) and desktop at 1280×800 (16:10). Those are CSS pixels, not hardware pixels — 4K monitors report much the same logical widths as ordinary ones because the device pixel ratio absorbs the difference, so wireframe against the width the browser lays out with, never the panel's spec sheet. Any screen can be dragged to a custom size when the presets miss what you need, such as an ultrawide monitor or an embedded panel.
- Can I build a design system or team library with this?
- Not a full one, but shared components here are the same primitive design systems and team libraries are built on: one master, many instances, edited in one place. The difference is that they live in this browser and travel as JSON rather than syncing to a hosted library. That is usually the right trade for early design work, where the point is deciding structure fast rather than governing it. When the layout settles, the Nodlume workspace carries it into a themed, code-generating project.
Design the whole app, not just the layout
In the Nodlume workspace, layout is one concern of a full product designer — route trees, data models, themes and RBAC that ground the generated code of a real Next.js project, with AI generation and real-time collaboration on top.
New to this? Two guides cover the thinking behind the canvas: wireframe vs mockup vs prototype explains which fidelity a question deserves and why sketching at the wrong one wastes design work, and HTML wireframes before code walks through settling the structure of a page on a canvas first, so the markup you eventually write implements a decision instead of discovering one.