Your files never leave your device. All processing happens locally in your browser.
How do I make a low-fidelity wireframe for free in my browser?
Open the Wireframe Tool, pick a true-aspect artboard (Desktop 1440×1024, Tablet 768×1024, Mobile 375×812, Square or Custom), then click low-fi UI blocks — container, nav bar, heading, text, paragraph, button, input, textarea, image, avatar, card, list, divider, icon — to drop them on the canvas. Drag to move, grab any of the eight handles to resize, snap to the grid, align with live guides, re-order, duplicate, and double-click to rename. Undo/redo with Ctrl+Z / Ctrl+Shift+Z, then export a PNG or SVG or save the project as JSON — all 100% in your browser, nothing uploaded.
True-aspect artboards for desktop, tablet, mobile, square or a custom size
Undo/redo, arrow-nudge, Ctrl+D duplicate, double-click to rename, delete
Starter templates: blank, landing page, dashboard, mobile app
Export PNG (2×) or crisp SVG, and save/load the project as JSON — no upload
What is
Low-fidelity wireframe
A low-fidelity (low-fi) wireframe is a deliberately rough, grayscale sketch of a screen’s STRUCTURE — where the nav, headings, blocks of text, images, buttons and lists sit and how they relate — drawn without real colours, brand fonts or imagery. Its whole point is speed and focus: by leaving out visual polish it keeps a team discussing layout, hierarchy and user flow instead of the shade of a button, and it is cheap to change. A wireframe differs from a MOCKUP (which adds high-fidelity visual design) and a PROTOTYPE (which adds clickable interactivity); wireframes sit at the low-fidelity, static end of the fidelity spectrum, and are where most projects start.
Design
Related terms
wireframemockupprototypelow fidelityhigh fidelityUI kitartboardinformation architectureuser flowBalsamiqExcalidrawsnap to gridplaceholder
Frequently Asked Questions
No. Every element is just a small object of numbers and a label held in the page. The board is drawn as SVG, PNG is rasterised on an in-page canvas, and projects save to your browser’s localStorage or a file you download — there is no upload, no server and no CDN in the editing path.
The Wireframe Tool is 100% client-side. Each element you add is a typed object (a type, x/y position, width/height and a text label) stored in React state in your browser tab. A pure engine serialises those objects to an SVG document for the live preview and for SVG export; PNG export draws that same SVG onto an in-memory HTML5 <canvas> at 2× and reads it back with toDataURL; and Save writes the project JSON to your browser’s own localStorage while Export JSON downloads a file you keep. None of these steps contact a server, an API or a CDN, and nothing you draw ever leaves the device. The tool works offline once cached, keeps no accounts and sets no tracking; close the tab and anything you did not save is gone.
A wireframe shows structure and layout in low fidelity (grayscale, static). A mockup adds high-fidelity visual design — real colours, typography and branding. A prototype adds interactivity so people can click through and test the flow. This tool makes low-fi wireframes on purpose.
They are three points on a fidelity spectrum. A WIREFRAME is a low-fidelity, static blueprint: grayscale boxes and placeholder text that answer “what goes where” and “what’s the hierarchy” without committing to visuals. A MOCKUP is high-fidelity and static: it layers real brand colours, typography, spacing and imagery onto that structure so stakeholders can judge the look. A PROTOTYPE adds interactivity — clickable links, navigation between screens, sometimes animation — so users can actually try the flow. Teams usually move wireframe → mockup → prototype, and starting low-fi is deliberate: changes are cheap and reviewers stay focused on the big picture rather than the colour of a call-to-action. This tool is built for the first stage; when the structure is agreed you move the design into a hi-fi tool.
That is intentional. Low fidelity removes colour, real fonts and imagery so reviewers focus on layout and flow, not pixels. Polished mock-ups this early make people fixate on the shade of a button and make every change more expensive.
The plain grayscale look is a feature, not a limitation. When a design looks finished too early, stakeholders comment on what they SEE — the exact colour, the font, the rounded corner — instead of what matters at this stage: whether the structure, hierarchy and user flow are right. Low-fi wireframes are colourless and rough on purpose so the conversation stays on the big ideas, and because they are quick to draw they are cheap to throw away and redo — the opposite of an expensive hi-fi mock-up. That is why this tool draws every element as a monochrome placeholder (bars for text, a box-with-an-X for images) and offers no brand colours or real typography; it is optimised for aligning a team fast, then handing off to a hi-fi tool.
Yes. Export a 2× PNG for sharing or a crisp vector SVG that scales to any size, and Save the project to your browser or Export it as a JSON file you can re-import later to keep editing. Everything is generated locally.
You have four outputs, all produced on your device. PNG export rasterises the board at 2× for a crisp image you can paste into a doc or chat. SVG export gives you a vector file that stays sharp at any size and can be edited in a vector app. Save stores the whole project in your browser’s localStorage so it is there when you return on the same device/browser, and Export JSON downloads a portable project file; Import JSON loads either back so you can continue editing — the JSON is the true editable master. Because PNG is a fixed-resolution raster while SVG and JSON are not, keep the SVG or JSON if you want to scale or keep working; use PNG only for a flat share.
Detailed Explanation
📖How It Works
What the Wireframe Tool Does
The Wireframe Tool is a 100% client-side low-fidelity wireframing canvas — the free web equivalent of Balsamiq or Excalidraw’s wireframe mode. You pick a true-aspect artboard (Desktop 1440×1024, Tablet 768×1024, Mobile 375×812, Square or a Custom size) and drop 14 low-fi UI primitives onto it: container, nav/header bar, heading, text line, paragraph, button, input, textarea, image placeholder (box + X), avatar, card, list, divider and icon. Every element is draggable, resizable from eight handles, selectable, deletable, duplicatable, re-orderable and renamable by double-click. Snap-to-grid, live alignment guides, undo/redo, starter templates and PNG/SVG/JSON export round it out — all in the browser, nothing uploaded.
A framework-free engine (wireframeEngine.ts) holds the whole model as plain typed objects — a type, x/y, width/height and a label — and owns every geometric operation: point-in-rect hit-testing (top-most first), eight-handle resize with a minimum size and in-board clamping, grid snapping, and alignment-guide computation that latches a moving element’s left/centre/right and top/middle/bottom onto nearby references. Z-order is just array order, so bring-forward / send-back are index swaps. The same engine serialises each element to a deterministic grayscale SVG group; the page renders that string for the live board and reuses it verbatim for SVG export, so what you see is exactly what you export.
Elements are plain typed objects; z-order is array order
Hit-testing returns the top-most element; 8-handle resize clamps to a min size + board
Alignment guides snap edges/centres to other elements + artboard midlines
One SVG serialiser drives both the live preview and SVG export (WYSIWYG)
Undo/redo is a past/future stack; drags commit a single history step on pointer-up
🔧Technical Details
Interaction, Snapping and Export Internals
Pointer input is mapped from screen pixels into artboard units via the SVG’s bounding rect, so hit-testing and handle tolerance stay correct at any zoom. During a move the engine returns a snapped position plus the guide lines to draw; during a resize it recomputes the dragged edges. Snap-to-grid uses a 16px step; alignment guides use a pixel-scaled threshold. PNG export builds the standalone SVG, encodes it as a data: URI, decodes it through an Image, and draws it to an offscreen <canvas> at 2× before toBlob — a data URI keeps the canvas untainted so the download always works. SVG export writes the vector document directly, and Save/Export serialise a validated project JSON (localStorage or a downloaded file).
Screen→artboard pointer mapping via getBoundingClientRect keeps hit-tests accurate
Snap step is 16px; alignment threshold scales with the on-screen size
PNG = SVG → data URI → Image → 2× canvas → toBlob (untainted, offline)
SVG export is a direct vector document; JSON is validated on import
Use it at the very start of a project, when speed and focus beat detail: sketching a page or app screen to agree structure and user flow before anyone argues about colour or fonts, running a quick idea past stakeholders or in user testing, documenting information architecture, or blocking out a layout to hand to a hi-fi tool. Because low-fi wireframes are colourless and quick, they are cheap to change and easy to throw away — exactly the right posture early on, when hi-fi mock-ups make people fixate on pixels and make every edit expensive. Start from the landing-page, dashboard or mobile-app template, adapt it, and export a PNG to drop into a doc or the SVG/JSON to keep iterating.
Best for early structure, hierarchy and user-flow decisions
Great for stakeholder reviews, user testing and IA documentation
Low-fi = cheap to change and safe to discard; hi-fi too early is costly
Templates give a fast starting point for common screens
Hand off the SVG/JSON to a hi-fi visual-design tool when structure is agreed
⚠️Limitations
Honest Limitations
This is a low-fidelity STRUCTURE tool, not a hi-fi visual-design or interactive-prototyping suite. The grayscale, sketchy look is intentional and cannot be styled with brand colours, real typography or imagery — that focus is the point. It does not simulate clicks, navigation between screens, responsive breakpoints or animation; each artboard is a fixed canvas and elements do not reflow. PNG export is a fixed-resolution raster (rendered at 2×), while the SVG stays crisp at any size, so keep the SVG or the JSON as your editable master. Specimen text renders in your system sans-serif, not a specific font. It is a fast blueprint to align a team, then move to a hi-fi tool.
Low-fi structure only — no brand colours, real fonts or imagery (by design)
No interactivity: it does not simulate clicks, navigation, breakpoints or motion
Fixed artboards; elements do not responsively reflow
PNG is a fixed raster (2×); SVG/JSON are the scalable, editable masters
Text uses the system sans-serif, not a specific typeface
🔒Privacy & Security
Private by Design
Everything happens on your device. Each element is a small object of numbers and a label held in the page; the engine draws the board as SVG, PNG export rasterises that SVG on an in-page canvas, and projects save to your browser’s own localStorage or to a JSON file you download and re-import. There is no upload, no server and no CDN anywhere in the editing or export path — the only optional network use is consent-gated ads. The tool works offline once cached, keeps no accounts and sets no tracking; close the tab and anything you did not save is gone.
Elements are local objects; the board is local SVG
PNG rasterised on an in-page canvas; no upload, server or CDN
Save = localStorage; Export/Import = a JSON file you control
Works offline once cached; no accounts, no tracking
Unsaved work is discarded on tab close
Ways to wireframe a screen
Approach
How it works
Trade-off
Used here
Low-fi wireframe tool (this)
Drop grayscale UI blocks on a true-aspect artboard
Fast, focused, cheap to change; not hi-fi or interactive
Yes
Generic drawing app (e.g. Excalidraw)
Draw rectangles, lines and text by hand
Flexible sketching, but shapes are not real UI blocks and break on resize
No
Hi-fi design tool (e.g. professional design tools)
Full visual design with real styles + prototyping
Powerful, but heavy and premature for early structure work
Later stage
Paper sketch
Pencil on paper
Fastest to start, but not editable, shareable or exportable
No
All editing and export here run in the browser; nothing is uploaded. As of July 2026.
