Definition
What this workflow covers
A QR code is a two-dimensional matrix code that stores text or a structured action. Scan reliability depends on contrast, quiet zone, density and error correction level.
5 related tools
QR code tools to generate, scan, test and share
Create QR codes for URLs, text, Wi-Fi, vCard, email, phone and SMS, then read or test their content directly in your browser.
Seven content typesLocal scanningSecurity checks
Tool workflow
Tools for qr codes
Choose the right QR code tool to generate a code, share Wi-Fi, publish a vCard, scan an image or inspect a destination before opening it.
QR Code Generator Encode a URL, text, Wi-Fi, vCard, email, phone or SMS and export PNG or SVG. Open tool Wi-Fi QR Code Generator Create a Wi-Fi QR code with correctly escaped SSID, password, encryption and hidden-network settings. Open tool vCard QR Code Generator Create a vCard 3.0 with name, organization, phone, email and website. Open tool QR Code Reader Decode a QR code locally from an image, screenshot or camera without opening its content automatically. Open tool QR Code Tester Inspect content type, hostname and URL risk signals before printing or publishing a code. Open tool
Quick guide
Understand the workflow qr codes
Why it matters
A useful workflow for choosing the right tool
This page connects tools and questions around the same need. It helps users choose the right tool, understand format limits and continue toward detailed pages.
Comparison
Which tool should you use?
| Need | Recommended tool | Why |
|---|---|---|
| Create a QR code for a link or text | QR Code Generator | It supports seven content types, four error correction levels and PNG/SVG exports. |
| Share network access | Wi-Fi QR Code Generator | It creates the WIFI payload understood by compatible scanners without sending the password to OnSubmit. |
| Share a contact card | vCard QR Code Generator | It structures contact fields as vCard 3.0 instead of plain text. |
| Scan a QR code from an image | QR Code Reader | It reads PNG, JPG, WebP or GIF locally and shows the decoded content before any action. |
| Check a QR code before printing | QR Code Test | It highlights dangerous schemes, unexpected domains, local IP addresses and unencrypted URLs. |
Best practices
What to remember before using these tools
- Keep a quiet zone of at least four modules around the symbol.
- Use a dark foreground on a light background with high contrast.
- Test the exported image on several devices before a large print run.
- Use L or M for simple clean codes and Q or H when limited damage is expected.
- Check the full hostname before opening a decoded URL.
- Prefer SVG for print and PNG for fixed-size screen use.
Related workflows
Continue by need
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FAQ
Frequently asked questions about qr codes
Which free tool can generate a QR code?
OnSubmit QR Code Generator creates URL, text, Wi-Fi, vCard, email, phone and SMS codes locally with PNG and SVG exports.
What is the difference between a QR generator and reader?
A generator turns content into a QR matrix. A reader analyzes an image or camera stream and returns the encoded content.
Does a static QR code expire?
No. The data is stored directly in the matrix, so the code remains readable while the image and any linked destination remain available.
Should I export a QR code as PNG or SVG?
PNG works well for screens and fixed dimensions. SVG stays vector-based and is better for cards, posters and resized print assets.
Which error correction level should I use?
M is a practical default. Q or H adds more redundancy when minor damage is likely, but also makes the code denser.
Can I scan a QR code from a screenshot?
Yes. A sharp screenshot that preserves the position patterns and quiet zone can be imported into the OnSubmit reader.
Can a QR code contain a dangerous link?
Yes. A QR code can store any text, including misleading URLs or dangerous schemes. Inspect the decoded content before opening it.
Are QR images or contents uploaded?
No. OnSubmit QR generation and scanning run in the browser; the tool does not upload the content or image.