How to use: QR Code Scan Test
QR Code Scan Test is a free online qr tool that render your QR settings and then decode the result locally, comparing it to the original payload, plus quiet zone, contrast, density and capacity checks with a Good / Warning / Risk verdict instantly in your browser. Paste your data, adjust the options and get the result in real time — no installation, no sign-up, and nothing is ever uploaded to a server.
Description
Render your QR settings and then decode the result locally, comparing it to the original payload, plus quiet zone, contrast, density and capacity checks with a Good / Warning / Risk verdict.
- qr
- Because everything is computed client-side, QR Code Scan Test is safe to use with sensitive data such as API keys, tokens or private logs.
How to use
Using QR Code Scan Test takes three steps:
- Paste your data into the input box (or load the example).
- Configure the options to match your target format or scenario.
- Copy, download or inspect the output — it updates live as you type.
Run
Examples
Renders the symbol, decodes its own output and compares — then reports quiet zone, contrast, density and capacity with a Good / Warning / Risk verdict.
Output (generated live by the tool just now)
Self-test: FAILED
rendered 264×264px, decoded back and compared to the original payload
decoded ≠ original ✗ ("No QR code detected in this image.")
Checks
Quiet zone 4 module(s) ✓
Contrast 21.00:1 ✓
Logo coverage 0% ✓
Symbol size version 2, 25×25 modules
Output size 264×264 px
Payload 25 bytes / 2331 max at EC M
Verdict: RISK — self-decode failed
This is a rendering self-test, not a guarantee: it proves the generated matrix
decodes correctly, but real-world scanning also depends on print quality,
lighting, focus and the scanner app.
This output was produced by actually running the tool, not written by hand.
Use cases
Common situations where QR Code Scan Test helps:
- Render your QR settings and then decode the result locally, comparing it to the original payload, plus quiet zone, contrast, density and capacity checks with a Good / Warning / Risk verdict.
Parameters
| key | Options | type | allowed | default | QR Code Scan Test |
|---|---|---|---|---|---|
value | Payload to test | text | — | https://www.26173.com/en/ | https://www.26173.com/en/ |
ec | Error correction | select | M (M ≈ 15% (default)), L (L ≈ 7%), Q (Q ≈ 25%), H (H ≈ 30% (needed for logos)) | — | M |
version | Version (0 = auto) | number | — | 0 | — |
margin | Quiet zone (modules) | number | — | 4 | 4 |
scale | Module size (px) | number | — | 8 | 8 |
fg | Foreground | color | — | #000000 | — |
bg | Background | color | — | #ffffff | — |
dot | Module style | select | square (Square), rounded (Rounded), dots (Dots) | — | — |
corner | Finder pattern style | select | square (Square (safest)), styled (Styled) | — | — |
Input: text · Output: text · live update while typing: ✓
FAQ
What is QR Code Scan Test?
QR Code Scan Test render your QR settings and then decode the result locally, comparing it to the original payload, plus quiet zone, contrast, density and capacity checks with a Good / Warning / Risk verdict. It runs entirely in your browser, so your data stays private.
Is QR Code Scan Test free to use?
Yes. QR Code Scan Test is free, unlimited and works without registration or installation.
Does my data get uploaded?
No. All processing happens locally in your browser; nothing is sent to any server.
Good to know
- Everything runs client-side, so extremely large inputs are limited by your browser tab’s memory rather than by a server upload limit.