What is the maximum data capacity of a QR code?

QR codes can store up to 7,089 numeric characters, 4,296 alphanumeric characters, 2,953 bytes of binary data, or 1,817 Japanese Kanji characters. The actual capacity depends on the version (size from 21×21 to 177×177 modules) and error correction level chosen. Higher error correction reduces capacity but improves scannability when damaged.

Can I decode a QR code from an image?

Yes! Switch to the "Decode" tab and upload a QR code image file (PNG, JPEG, GIF, BMP) or provide its URL. Click "Load" then "Decode" to extract the encoded data. The tool uses advanced image processing to handle rotated, skewed, or partially damaged QR codes. Results appear in the text area below for easy copying.

What error correction levels are available?

Four levels are available: L (Low - 7% recovery), M (Medium - 15%), Q (Quartile - 25%), and H (High - 30%). Higher levels allow the QR code to remain scannable even when damaged, dirty, or partially covered by a logo. Level H is recommended when adding logos or printing on textured surfaces. Lower levels produce simpler codes that scan faster.

Can I customize the QR code appearance?

Yes! You can change the foreground color (default black) and background color (default white) using the color pickers. You can also add a custom logo image to the center - use Level H error correction for best results with logos. Keep logos small (under 30% of QR size) and ensure good contrast. Custom colors should maintain high contrast for reliable scanning.

What types of data can I encode in a QR code?

QR codes support multiple data types: URLs/websites, plain text, email addresses (mailto:), phone numbers (tel:), SMS messages (sms:), WiFi credentials (WIFI:T:WPA;S:network;P:password;;), vCard contacts, geographic locations (geo:latitude,longitude), calendar events, and cryptocurrency addresses. Most smartphones automatically detect the type and offer appropriate actions (open browser, save contact, connect to WiFi).

Why won't my QR code scan properly?

Common issues: insufficient contrast between foreground/background colors, logo too large covering critical areas, error correction level too low for the amount of damage, image resolution too low when printed, or excessive compression artifacts. Solutions: use Level H error correction, keep logos under 30% size, maintain high contrast (dark on light), test print at actual size, and avoid gradient backgrounds.

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QR Code 生成器

線上免費製作客製化QR碼，適用於網址、WiFi、名片等。一鍵生成，立即下載！馬上試用我們的QR碼生成工具吧！

🎨 轻图神器

图片压缩、裁剪、去水印工具

📋 轻测神器

心理测试、性格测试与趣味测试工具

🧮 轻算神器

房贷、个税、汇率等计算工具

🥚 洛克孵蛋百科

洛克王国世界玩家孵蛋助手

什麼是 ToolFK QR Code 產生器？

ToolFK QR Code 產生器可在瀏覽器將網址、文字、Wi-Fi、名片等變成可掃描的 QR Code。下載 PNG 或 SVG 用於海報、菜單、識別證。無需安裝，基本功能免費。

可搭配條碼產生器、短網址產生器。

主要功能

URL、文字、Wi-Fi、vCard、簡訊
尺寸與糾錯 L/M/Q/H
PNG/SVG 下載
即時預覽
高對比
免費生成

How to Create a QR Code with ToolFK

開啟 QR Code 頁面。
選擇類型。
填寫資訊。
設定尺寸與糾錯。
手機驗證。
下載 PNG/SVG。

適用場景

餐廳 Wi-Fi
會議胸牌
產品包裝
vCard 名片
App 海報

Frequently Asked Questions

會過期嗎？

靜態碼視 URL 而定。

糾錯等級？

M/Q 或 H。

可加 Logo？

小圖可，請測試。

SVG/PNG？

依用途選擇。

保存內容？

勿編碼機密。

掃不到？

查對比度與 https。

最後更新：2026年7月1日

QR Code 生成器

🎨 轻图神器

📋 轻测神器

🧮 轻算神器

🥚 洛克孵蛋百科

什麼是 ToolFK QR Code 產生器？

主要功能

How to Create a QR Code with ToolFK

適用場景

相關工具

Frequently Asked Questions

會過期嗎？

糾錯等級？

可加 Logo？

SVG/PNG？

保存內容？

掃不到？