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.

Free Online QR Code Generator – Create Custom QR Codes

What Is the ToolFK QR Code Generator?

The ToolFK QR Code Generator creates scannable QR codes from text, URLs, Wi-Fi credentials, and contact cards in your browser. Type or paste content, pick a size and error-correction level, then download a PNG or SVG ready for print flyers, restaurant menus, and event badges. No desktop software and no sign-up for basic generation.

Marketers embed campaign links on posters; cafés share Wi-Fi without dictating passwords; developers test deep links before app store release. Combine output with our Barcode Generator for retail SKUs, or shorten long URLs first via the URL Shortener to keep codes readable.

Key Features

URL, plain text, Wi-Fi, vCard, and SMS payload types
Adjustable size, margin, and error-correction (L/M/Q/H)
PNG and SVG download for print and web
Live preview updates as you edit content
High contrast defaults for reliable phone scanning
Free unlimited generation in the browser

How to Create a QR Code with ToolFK

Open the QR Code Generator page.
Choose a content type (URL, text, Wi-Fi, etc.).
Enter your data in the input fields shown.
Set size, margin, and error-correction if options appear.
Preview the code and scan it with your phone to verify.
Download PNG or SVG and place it on your design or print file.

Best Use Cases

Restaurant Wi-Fi cards and table tents
Conference badges linking to agendas
Product packaging with support URLs
Business cards with vCard contact blocks
App download landing pages on posters

Related Tools

Barcode Generator — EAN13 and retail barcodes
URL Shortener — shrink long links before encoding
Password Generator — secure Wi-Fi passphrases

Frequently Asked Questions

Will my QR code expire?

Static codes encode your text directly and stay valid as long as the destination URL works. ToolFK does not replace your link with a redirect unless you encoded a short URL yourself.

What error-correction level should I choose?

Use M or Q for general print; pick H if the code may get partially covered by a logo. Higher correction increases module size.

Can I add a logo in the center?

Some designs allow a small center image. Keep coverage under roughly 30% and test scanning on multiple phones.

Is SVG better than PNG?

SVG scales cleanly for large posters; PNG is simpler for slides and chat apps. Both scan equally when exported sharply.

Do you store the content I encode?

Generation happens on demand for download. Avoid encoding passwords or private tokens in public materials.

Why won't my phone scan the code?

Check contrast, print size (at least ~2 cm), and that the URL includes https://. Shorten extremely long URLs first.

Last updated: July 1, 2026