feat: add styled QR code generator with logo and edge customization

Generates QR codes from a URL with center logo upload, adjustable logo
padding and size, dot/corner-square/corner-dot style pickers, color
controls, and PNG/SVG export. Uses error correction level H so the
logo can occlude up to ~30% of modules without breaking scannability.
This commit is contained in:
Julien Calixte
2026-05-28 11:47:39 +02:00
parent dd8bb08160
commit 39f763614b
3 changed files with 462 additions and 0 deletions

154
src/App.vue Normal file
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<script setup lang="ts">
import { reactive, ref } from 'vue'
import { useQrCode, type QrOptions } from './composables/useQrCode'
const preview = ref<HTMLDivElement | null>(null)
const options = reactive<QrOptions>({
data: 'https://example.com',
size: 320,
dotsType: 'rounded',
dotsColor: '#1f2937',
cornersSquareType: 'extra-rounded',
cornersSquareColor: '#1f2937',
cornersDotType: 'dot',
cornersDotColor: '#1f2937',
backgroundColor: '#ffffff',
image: null,
imageMargin: 8,
imageSize: 0.4,
hideBackgroundDots: true,
})
const { download } = useQrCode(preview, options)
const dotTypes = ['square', 'dots', 'rounded', 'classy', 'classy-rounded', 'extra-rounded'] as const
const cornerSquareTypes = ['square', 'dot', 'extra-rounded'] as const
const cornerDotTypes = ['square', 'dot'] as const
function onLogoChange(e: Event) {
const file = (e.target as HTMLInputElement).files?.[0]
if (!file) return
const reader = new FileReader()
reader.onload = () => {
options.image = reader.result as string
}
reader.readAsDataURL(file)
}
function clearLogo() {
options.image = null
const input = document.getElementById('logo-input') as HTMLInputElement | null
if (input) input.value = ''
}
</script>
<template>
<div class="app">
<header>
<h1>QR Code Studio</h1>
<p class="subtitle">Generate styled QR codes with logo, dots, and corner customization</p>
</header>
<main>
<section class="controls">
<div class="field">
<label for="url">URL or text</label>
<input id="url" v-model="options.data" type="text" placeholder="https://example.com" />
</div>
<fieldset>
<legend>Logo</legend>
<div class="field">
<input id="logo-input" type="file" accept="image/*" @change="onLogoChange" />
</div>
<div v-if="options.image" class="logo-actions">
<img :src="options.image" alt="logo preview" class="logo-thumb" />
<button type="button" class="ghost" @click="clearLogo">Remove logo</button>
</div>
<div class="field">
<label>
Logo padding
<span class="value">{{ options.imageMargin }} px</span>
</label>
<input v-model.number="options.imageMargin" type="range" min="0" max="40" step="1" />
</div>
<div class="field">
<label>
Logo size
<span class="value">{{ Math.round(options.imageSize * 100) }} %</span>
</label>
<input v-model.number="options.imageSize" type="range" min="0.1" max="0.6" step="0.01" />
</div>
<label class="checkbox">
<input v-model="options.hideBackgroundDots" type="checkbox" />
Hide dots behind logo
</label>
</fieldset>
<fieldset>
<legend>Body</legend>
<div class="field">
<label for="dotsType">Dot style</label>
<select id="dotsType" v-model="options.dotsType">
<option v-for="t in dotTypes" :key="t" :value="t">{{ t }}</option>
</select>
</div>
<div class="field">
<label for="dotsColor">Dot color</label>
<input id="dotsColor" v-model="options.dotsColor" type="color" />
</div>
</fieldset>
<fieldset>
<legend>Corners</legend>
<div class="field">
<label for="csType">Outer square style</label>
<select id="csType" v-model="options.cornersSquareType">
<option v-for="t in cornerSquareTypes" :key="t" :value="t">{{ t }}</option>
</select>
</div>
<div class="field">
<label for="csColor">Outer square color</label>
<input id="csColor" v-model="options.cornersSquareColor" type="color" />
</div>
<div class="field">
<label for="cdType">Inner dot style</label>
<select id="cdType" v-model="options.cornersDotType">
<option v-for="t in cornerDotTypes" :key="t" :value="t">{{ t }}</option>
</select>
</div>
<div class="field">
<label for="cdColor">Inner dot color</label>
<input id="cdColor" v-model="options.cornersDotColor" type="color" />
</div>
</fieldset>
<fieldset>
<legend>Background</legend>
<div class="field">
<label for="bg">Background color</label>
<input id="bg" v-model="options.backgroundColor" type="color" />
</div>
<div class="field">
<label>
Size
<span class="value">{{ options.size }} px</span>
</label>
<input v-model.number="options.size" type="range" min="160" max="640" step="20" />
</div>
</fieldset>
</section>
<section class="preview-pane">
<div class="preview-card">
<div ref="preview" class="preview"></div>
</div>
<div class="download">
<button type="button" @click="download('png')">Download PNG</button>
<button type="button" @click="download('svg')">Download SVG</button>
</div>
</section>
</main>
</div>
</template>

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import { onMounted, shallowRef, watch, type Ref } from 'vue'
import QRCodeStyling, {
type DotType,
type CornerSquareType,
type CornerDotType,
type FileExtension,
} from 'qr-code-styling'
export type QrOptions = {
data: string
size: number
dotsType: DotType
dotsColor: string
cornersSquareType: CornerSquareType
cornersSquareColor: string
cornersDotType: CornerDotType
cornersDotColor: string
backgroundColor: string
image: string | null
imageMargin: number
imageSize: number
hideBackgroundDots: boolean
}
export function useQrCode(container: Ref<HTMLElement | null>, options: QrOptions) {
const qr = shallowRef<QRCodeStyling | null>(null)
onMounted(() => {
qr.value = new QRCodeStyling(toLibOptions(options))
if (container.value) qr.value.append(container.value)
})
watch(
() => ({ ...options }),
() => qr.value?.update(toLibOptions(options)),
{ deep: true },
)
const download = (extension: FileExtension) => {
qr.value?.download({ name: 'qrcode', extension })
}
return { download }
}
function toLibOptions(o: QrOptions) {
return {
width: o.size,
height: o.size,
type: 'svg' as const,
data: o.data || ' ',
image: o.image ?? undefined,
margin: 0,
qrOptions: { errorCorrectionLevel: 'H' as const },
dotsOptions: { color: o.dotsColor, type: o.dotsType },
backgroundOptions: { color: o.backgroundColor },
cornersSquareOptions: { color: o.cornersSquareColor, type: o.cornersSquareType },
cornersDotOptions: { color: o.cornersDotColor, type: o.cornersDotType },
imageOptions: {
crossOrigin: 'anonymous',
margin: o.imageMargin,
imageSize: o.imageSize,
hideBackgroundDots: o.hideBackgroundDots,
},
}
}

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src/style.css Normal file
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:root {
font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
color-scheme: light;
color: #0f172a;
background: #f1f5f9;
-webkit-font-smoothing: antialiased;
text-rendering: optimizeLegibility;
}
* {
box-sizing: border-box;
}
body {
margin: 0;
min-height: 100vh;
}
#app {
min-height: 100vh;
}
.app {
max-width: 1100px;
margin: 0 auto;
padding: 32px 24px 64px;
}
header {
margin-bottom: 28px;
}
h1 {
margin: 0 0 6px;
font-size: 28px;
font-weight: 700;
letter-spacing: -0.01em;
}
.subtitle {
margin: 0;
color: #64748b;
font-size: 15px;
}
main {
display: grid;
grid-template-columns: minmax(0, 1fr) minmax(0, 380px);
gap: 28px;
align-items: start;
}
@media (max-width: 880px) {
main {
grid-template-columns: 1fr;
}
}
.controls,
.preview-card {
background: #fff;
border: 1px solid #e2e8f0;
border-radius: 14px;
padding: 20px;
box-shadow: 0 1px 2px rgba(15, 23, 42, 0.04);
}
.controls {
display: flex;
flex-direction: column;
gap: 18px;
}
fieldset {
border: 1px solid #e2e8f0;
border-radius: 10px;
padding: 14px 16px 16px;
margin: 0;
display: flex;
flex-direction: column;
gap: 12px;
}
legend {
padding: 0 6px;
font-size: 13px;
font-weight: 600;
color: #475569;
text-transform: uppercase;
letter-spacing: 0.06em;
}
.field {
display: flex;
flex-direction: column;
gap: 6px;
}
.field label {
font-size: 13px;
font-weight: 500;
color: #334155;
display: flex;
justify-content: space-between;
gap: 8px;
}
.value {
color: #64748b;
font-variant-numeric: tabular-nums;
font-weight: 400;
}
input[type="text"],
select {
width: 100%;
padding: 9px 11px;
border: 1px solid #cbd5e1;
border-radius: 8px;
font: inherit;
background: #fff;
transition: border-color 0.12s, box-shadow 0.12s;
}
input[type="text"]:focus,
select:focus {
outline: none;
border-color: #6366f1;
box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.18);
}
input[type="color"] {
width: 100%;
height: 38px;
padding: 2px;
border: 1px solid #cbd5e1;
border-radius: 8px;
background: #fff;
cursor: pointer;
}
input[type="range"] {
width: 100%;
accent-color: #6366f1;
}
input[type="file"] {
font: inherit;
font-size: 13px;
}
.checkbox {
display: flex;
align-items: center;
gap: 8px;
font-size: 13px;
color: #334155;
cursor: pointer;
}
.logo-actions {
display: flex;
align-items: center;
gap: 12px;
}
.logo-thumb {
width: 44px;
height: 44px;
object-fit: contain;
border: 1px solid #e2e8f0;
border-radius: 8px;
background: #f8fafc;
padding: 4px;
}
.preview-pane {
display: flex;
flex-direction: column;
gap: 14px;
position: sticky;
top: 24px;
}
.preview-card {
display: flex;
align-items: center;
justify-content: center;
padding: 24px;
min-height: 360px;
}
.preview {
display: flex;
}
.preview svg,
.preview canvas {
display: block;
max-width: 100%;
height: auto;
}
.download {
display: grid;
grid-template-columns: 1fr 1fr;
gap: 10px;
}
button {
font: inherit;
font-weight: 600;
font-size: 14px;
padding: 10px 14px;
border-radius: 10px;
border: 1px solid transparent;
background: #4f46e5;
color: #fff;
cursor: pointer;
transition: background 0.12s, transform 0.05s;
}
button:hover {
background: #4338ca;
}
button:active {
transform: translateY(1px);
}
button.ghost {
background: transparent;
color: #475569;
border-color: #cbd5e1;
padding: 6px 10px;
font-size: 13px;
}
button.ghost:hover {
background: #f1f5f9;
color: #1e293b;
}