Best for
Founders and indie devs who need an embeddable QR generator without a third-party API dependency.
Stack
A ready-made QR Code Generator UI you can fork, run, and customize with the prompt pack below.
What's actually inside
The honest engineer's breakdown — what the QR Code Generatortemplate does, how it's wired, and where it's opinionated.
This template renders QR codes entirely in the browser using qrcode.react — no server calls, no API keys, no rate limits. The QRInputPanel accepts any URL or plain text and feeds it to the QRPreviewCanvas in real time via React state. The CustomizationToolbar adds foreground color, background color, a size slider, and an error correction level selector (Low/Medium/Quartile/High), all wired to qrcode.react props.
The DownloadButton exports the current code as a PNG by calling canvas.toDataURL() or serializes the SVG element to a Blob for an SVG download. A FormatToggle lets users switch between the two output modes. An optional HistoryList stores recently generated codes in localStorage so users can restore previous inputs without re-typing.
Honest caveat: the HistoryList state resets on page refresh unless localStorage hydration is implemented correctly — and V0 sometimes generates it with a direct call in the component body instead of inside useEffect, which breaks under Next.js SSR. The color picker may also reference a non-existent shadcn component (see Gotchas). Both are quick fixes, not blockers.
Key UI components
QRInputPanelTextarea/input for URL or text content with a max-length counter
QRPreviewCanvasLive SVG/canvas QR rendering that updates in real time as input changes
CustomizationToolbarForeground/background color pickers, size slider, and error correction level selector
DownloadButtonExports the current QR as PNG via canvas.toDataURL() or as an SVG blob download
FormatToggleSwitches qrcode.react between SVG output mode and canvas/PNG output mode
HistoryListStores up to 10 recently generated codes in localStorage with click-to-restore
Libraries it leans on
qrcode.reactReact wrapper for QR encoding; supports both SVG and canvas render modes
shadcn/uiInput, Slider, Select, and Button components for the customization panel
react-colorColor picker for foreground and background color inputs in CustomizationToolbar
Fork it and get it running
Everything runs in the browser — no env vars, no database, no API keys needed to get your first fork live on Vercel.
Fork the template in V0
Open https://v0.dev/chat/community/s7V3nM6MQFy in your browser. Click the 'Fork' button in the top-right of the chat view to copy the template into your own V0 workspace. V0 will open the forked project in a new chat where you can see the code and the live preview side by side.
Tip: You need to be signed in to v0.dev to fork — the free plan is enough.
You should see: The template opens in your V0 workspace with the QRPreviewCanvas visible in the Preview tab.
Verify the live QR preview
In the V0 editor, click the Preview tab. Type any URL (e.g., https://example.com) into the QRInputPanel. The QRPreviewCanvas should update in real time showing a scannable code. Use your phone camera to scan it and confirm it resolves to the right URL.
Tip: If the canvas renders blank, try switching the FormatToggle from canvas mode to SVG mode — the SVG renderer is more reliable in V0's sandbox.
You should see: A live QR code appears in the preview and is scannable with a smartphone.
Skip env vars — this template needs none
Open the Vars panel in the V0 sidebar. For a pure QR generator with no analytics backend, no env vars are needed — leave the panel empty. If you plan to add a Supabase backend later to save and share codes, you will add NEXT_PUBLIC_SUPABASE_URL and NEXT_PUBLIC_SUPABASE_ANON_KEY here.
You should see: Vars panel is empty; the template runs correctly without any configuration.
Publish to Vercel
Click the Share button (top-right of the V0 editor), then open the Publish tab. Click 'Publish to Production'. V0 deploys to Vercel and returns a live URL in 30–60 seconds. Copy the URL to verify the QR generator works identically on the deployed version.
You should see: A live Vercel URL is returned; the QR generator is publicly accessible.
Connect to GitHub for version control
Open the Git panel in the V0 sidebar and click Connect. Enter a repo name and choose your GitHub organization. V0 creates a branch named v0/main-{hash} and auto-commits all template files. Go to GitHub, open the pull request V0 created, and merge it to main to establish your baseline.
Tip: Connect Git early if you plan to continue customizing in Cursor or locally.
You should see: A GitHub repo is created with the template code and the first PR is merged to main.
Add a custom domain
In the Vercel Dashboard, open your project and navigate to Settings → Domains. Add your custom domain and follow the CNAME/A-record instructions from Vercel. SSL is provisioned automatically. This step is optional — your .vercel.app URL works immediately.
You should see: Your QR generator is accessible at your own domain with HTTPS.
The prompt pack
Copy-paste these straight into v0's chat to customize the QR Code Generatortemplate. Each one names this template's own components — no generic filler.
Add error correction level selector
Lets users choose the QR error correction level directly from the toolbar. Quartile or High is required before adding a logo overlay.
Add a shadcn Select component to the CustomizationToolbar with four options: Low (L), Medium (M), Quartile (Q), and High (H). Pass the selected value as the `level` prop to the QRPreviewCanvas component — qrcode.react accepts 'L' | 'M' | 'Q' | 'H'. Set the default to 'M'. Show a tooltip on the Select explaining that High correction allows a logo overlay but increases QR density.
Add SVG file export
Exports the QR code as a clean SVG file, perfect for print or Figma import without quality loss.
Add a second download button next to the existing PNG DownloadButton labeled 'Download SVG'. When clicked, query the SVG element rendered by qrcode.react inside QRPreviewCanvas, serialize it with new XMLSerializer().serializeToString(svgElement), convert to a Blob with type 'image/svg+xml', and trigger a browser download using URL.createObjectURL() with filename 'qr-code.svg'. Ensure the FormatToggle is set to SVG mode before serializing.
Save QR history to localStorage
Persists the last 10 generated QR codes across page refreshes so users can revisit previous codes without re-entering the URL.
After each QR generation in the QRInputPanel, push the input value and a thumbnail data-URL (from canvas.toDataURL()) into a HistoryList array stored in localStorage. Wrap all localStorage reads in a useEffect with an empty dependency array — never read localStorage directly in the component body, as Next.js SSR will throw ReferenceError. Render the last 10 entries as a scrollable sidebar panel below the CustomizationToolbar; clicking a history item restores its value to QRInputPanel and regenerates the code.
Add a logo/icon overlay on the QR code
Embeds a brand logo or icon in the center of the generated QR code — a common requirement for marketing campaigns and business cards.
Add a LogoUploader component inside the CustomizationToolbar — an image file input triggered by a camera icon button. On file select, read the image with FileReader.readAsDataURL() and draw it centered on the QRPreviewCanvas using canvas.drawImage() at 20% of the total canvas size (calculate position as (canvasSize * 0.4) for x and y). Automatically set the error correction level Select to 'H' when a logo is uploaded, since the logo covers central QR modules and requires maximum error correction to compensate.
Connect to Supabase to save and share QR codes
Persists generated QR codes to a database and creates shareable permalink URLs — turning the standalone tool into a shareable QR service.
Add a Supabase client configured with NEXT_PUBLIC_SUPABASE_URL and NEXT_PUBLIC_SUPABASE_ANON_KEY from the V0 Vars panel. Create a `qr_codes` table in Supabase with columns: id (uuid, primary key), url (text), svg_data (text), created_at (timestamptz default now()). Add a Save button next to the DownloadButton that inserts the current QRInputPanel value and the serialized SVG string into Supabase. After insert, generate a shareable permalink at /qr/[id] — create a dynamic route app/qr/[id]/page.tsx that fetches the record by ID and renders the SVG data directly so the link works without the original app state.
Add a Stripe paywall for bulk QR ZIP export
Monetizes the bulk export feature with a one-time Stripe payment, turning the free QR tool into a freemium product.
Create a /api/checkout/route.ts Server Action that calls stripe.checkout.sessions.create() with a one-time price using STRIPE_SECRET_KEY (server-only, no NEXT_PUBLIC_ prefix). Gate the BulkExportButton — which generates a ZIP of 50+ QR codes from a CSV input — behind a Stripe session check on the client using NEXT_PUBLIC_STRIPE_PUBLISHABLE_KEY. Handle the checkout.session.completed webhook at /api/webhooks/stripe/route.ts; use await request.text() (not request.json()) to read the raw body before calling stripe.webhooks.constructEvent() for signature verification with STRIPE_WEBHOOK_SECRET.
Gotchas when you extend it
The failures people actually hit when they push this template past its defaults — and the exact fix for each.
ReferenceError: localStorage is not definedWhy: V0 generates the HistoryList component with direct localStorage.getItem() calls in the component body. Next.js SSR executes component code on the server before the browser is available, so localStorage doesn't exist at that point.
Fix: Move all localStorage.getItem() calls inside a useEffect with an empty dependency array. Initialize the HistoryList state as an empty array and hydrate it in the effect after mount.
Move all localStorage.getItem calls inside a useEffect hook in the HistoryList component so they only run client-side. Initialize the history state as an empty array and set it in the effect.
QR canvas renders blank in V0 Preview but works after deployWhy: The V0 preview sandbox resolves npm packages via esm.sh, which sometimes fails to serve qrcode.react's internal dependencies consistently. The canvas render never fires because the module silently doesn't load.
Fix: Open the Code tab and verify the import matches the installed package name exactly. Switch the FormatToggle to SVG mode — the SVG renderer is more resilient in the sandbox. The deployed Vercel environment uses the real npm install and won't have this issue.
The component at https://ui.shadcn.com/r/styles/new-york-v4/color-picker.json was not foundWhy: V0 sometimes generates a reference to a color-picker shadcn component that does not exist in the official registry. This is a registry mismatch, not a code bug.
Fix: Replace the missing import with a native HTML `<input type="color">` element styled with Tailwind classes, or use react-colorful's HexColorPicker which is already in the template's stack.
Replace the missing shadcn color-picker component with a native HTML color input styled with Tailwind in the CustomizationToolbar. Use <input type="color" className="w-8 h-8 rounded cursor-pointer border-0"> for both foreground and background color pickers.
PNG download produces low-resolution output on retina screensWhy: The canvas element's internal resolution defaults to the CSS display size. On high-DPI screens, the CSS size is much smaller than the physical pixels, resulting in a blurry downloaded PNG.
Fix: Create an offscreen canvas at 2x or 4x the display size, render the QR at that resolution, then call toDataURL() on the high-res canvas.
Add a resolution selector (1x / 2x / 4x) to the DownloadButton that renders the QR code to an offscreen canvas at the selected multiplier before triggering the PNG download. Use window.devicePixelRatio as the default multiplier.
Template vs. custom — the honest call
A forked template gets you far, fast. Here's where it holds up, and where you'll outgrow it.
The template is enough when
- You need a standalone QR tool with no backend dependency and want it deployed in under 10 minutes.
- Your QR content is simple URLs or plain text with basic color and size customization.
- You're embedding the generator in a marketing site, docs page, or internal dashboard.
- You want a one-time export (PNG or SVG) with no account or user management.
Go custom when
- You need bulk QR generation from a CSV with thousands of rows and ZIP download.
- You need QR scanning and decoding in addition to generation.
- You need branded templates with logo overlay at scale using server-side rendering.
- You need analytics on QR scan events (clicks, locations, devices) linked to your own database.
If you need the generator wired to a real database, user accounts, or scan analytics, RapidDev can extend this v0 prototype to a production system — reach out for a scoping call.
Frequently asked questions
Is the QR Code Generator v0 template free to use?
Yes. V0 community templates are free to fork on any plan, including the free tier. The template itself uses open-source libraries (qrcode.react, shadcn/ui) with permissive licenses, so there are no runtime costs for a client-side deployment.
Can I use this template commercially?
Yes. qrcode.react is MIT-licensed, shadcn/ui components are MIT-licensed, and there are no usage restrictions on V0 community forks for commercial projects. You own the code after forking.
Why does my fork render a blank QR canvas in the V0 preview?
The V0 preview sandbox loads packages via esm.sh, which occasionally fails to resolve qrcode.react's dependencies. Switch the FormatToggle from canvas mode to SVG mode — SVG rendering is more reliable in the sandbox. After deploying to Vercel, the full npm installation runs correctly and the canvas mode works.
Do I need a database or API key to run this template?
No. The template is fully client-side — QR codes are generated in the browser using qrcode.react and exported via the HTML5 Canvas API. No env vars, no backend, and no third-party API are required to run the basic generator.
How do I add my own branding colors to the CustomizationToolbar?
Open the Code tab in V0 and find the CustomizationToolbar component. Change the default foreground and background color values passed to the color picker state. You can also pre-set the color inputs to your brand hex values so users start with your palette.
Can I embed this QR generator inside an existing Next.js project?
Yes. Connect the fork to GitHub via the Git panel, then copy the QRInputPanel, QRPreviewCanvas, and CustomizationToolbar components into your existing project. Install qrcode.react as a dependency and import the components where needed.
Can RapidDev customize this template for me?
Yes — RapidDev specializes in extending v0 prototypes to production. If you need Supabase-backed QR saving, scan analytics, user accounts, or bulk generation from CSV, a scoping call takes about 30 minutes.
Outgrowing the template?
RapidDev turns v0 prototypes into production apps — real auth, database, and payments — at $13K–$25K.
Book a free consultation30-min call. No commitment.