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QR Code Generator

Developer Tools

Text, links and WiFi to QR code with PNG download

Quick Answer

QR Code Generator: Text, links and WiFi to QR code with PNG download. Error correction: L 7% / M 15% / Q 25% / H 30%.

Error correction

Size & colors

QR version—
Payload length26 chars
Damage tolerance15%

How QR works

  1. 1Version = grid size: V1 is 21×21 modules, each version adds 4. Higher version = more data, harder to scan from distance.
  2. 2Level M can recover data even if 15% of the code is damaged (Reed–Solomon error correction).
  3. 3Wi-Fi format: WIFI:T:WPA;S:ssid;P:password;; — phones join the network directly after scanning.
  4. 4Keep a quiet zone (blank margin) of at least 4 modules around the code — this tool adds it automatically.

Error correction levels

LevelRecoveryCapacity (V40)Use case
L7%~2,953 digits / 1,852 bytesideal print
M15%~2,331 digits / 1,440 bytesdefault
Q25%~1,663 digits / 1,020 bytesoutdoor/slight damage
H30%~1,273 digits / 780 byteswith logo overlay
For print, export at ≥512px and test-scan from the expected distance. Dark modules must be darker than background — inverted (light-on-dark) codes fail on many scanners. Adding a logo? Use level H and keep the logo under 20% of the area.

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How to Use

  1. Paste or type content: drop code/text into the QR Code Generator or fill the parameters.
  2. Choose mode/options: switch format, rules or processing as needed.
  3. Live output: results appear instantly — nothing is submitted, data stays in your browser.
  4. One-click copy: copy the output straight into your development environment.

Key Points

  • QR Code Generator is a free online developer tool — open and use, no sign-up.
  • All calculations run locally in your browser; your data never leaves the device.
  • Key capability: Text, links and WiFi to QR code with PNG download.
  • Results come with formulas and reference tables so you can verify every number.

Formula & How It Works

QR Code (ISO/IEC 18004)

Error correction: L 7% / M 15% / Q 25% / H 30%
Versions 1–40 (each +4 modules per side); V40-L holds 4296 chars
WiFi payload: WIFI:T:WPA;S:name;P:password;;

FAQ

How do I use the QR Code Generator?
Open the page and fill in the input fields — results update automatically. Text, links and WiFi to QR code with PNG download.
Are the results accurate?
Yes. Standard formulas and conversion factors are used and verified.
Is it free? Do I need to sign up?
Completely free. No registration, login or download required.
Does it work on mobile?
Yes. The responsive design works on phones, tablets and desktops.
Is my data saved?
No. Everything runs locally in your browser.

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Source & Updates

Based on RFC 4648, ECMA-262 and related specifications. Last updated: 2025-07

Last updated:

Formulas and content on this page are reviewed by the YiJianSuan team. For reference only — official sources prevail.

Maintained and periodically reviewed by the YiJianSuan editorial team — review process in ourEditorial Policy.

Cite this page: YiJianSuan. QR Code Generator[EB/OL]. https://www.yijiansuan.com/en/c/dev/qr-code

Results provided by this tool are for reference only and do not constitute professional advice.