Prepare shareable links
Turn long URLs or Wi-Fi settings into QR images for mobile testing, printed notes, and internal documents.
QR Code Generator/Scanner
브라우저 내부 처리
Generate QR codes and scan uploaded QR images in the browser.
QR generation and scanning checks
Turn a URL or Wi-Fi details into a QR code for mobile testing or printed notices. In reverse, upload a QR image you were sent to see what string it contains before opening it. A QR code is not encryption — it is a string rendered as a picture, readable by anyone.
Inspect QR images
Upload a screenshot or received QR image to see the actual text before opening an unknown link.
Local processing
QR generation and scanning happen in the browser; uploaded images are not sent to a separate server by this tool.
Errors you will hit
It scans on screen but not in print
Longer content packs the grid more densely. Shorten long URLs before generating for small print, and keep a quiet zone of at least four modules around the code.
Adding a center logo breaks it
Error correction tolerates some obstruction, but not unlimited. If you plan to overlay a logo, raise the error correction level to H and cover less than 30% of the area.
Things to check
Large payloads scan poorly
The longer the value, the denser the QR code becomes. Shorter links are usually more reliable for small print sizes.
Review Wi-Fi details
Check SSID, encryption type, and password before sharing. Avoid placing sensitive network credentials in public QR codes.
Most scan failures are the margin
The quiet zone around the code needs to be at least four modules wide. Cropping the image tight or placing it directly on a coloured background stops cameras from finding the code boundary. This is usually the cause of print failures.
A QR code is not encryption
A QR code is just a string rendered as an image, so anyone can read it. A Wi-Fi QR on an office wall means one photo copies the password. Use a separate guest network instead.
Higher error correction means denser codes
QR codes embed redundant data so they scan even when partly obscured. Raising the level adds resilience but packs more modules into the same area. Medium suits print; a lower level is fine on screen.
More: step-by-step usage and worked examples
How to use it
- Choose whether you are creating a text, URL, or Wi-Fi QR code.
- Enter the value that should be scanned and confirm that the QR image renders correctly.
- Save the PNG or scan it with another device when you need a final check.
- When decoding an image QR, use a sharp source image and inspect the resulting text before opening it.
Real input and output
A link QR code
Input
https://taxijjang.com/jsonOutput
Scanning opens that address directlyA Wi-Fi QR code
Input
WIFI:T:WPA;S:CafeGuest;P:hello2026;;Output
Scanning joins the network without typing the passwordT is the security type, S the network name, P the password. The two trailing semicolons are required.
Tools that pair well
- PDF Merge/Split
- Image Optimizer — Before uploading an image you have to decide how far you can compress before the quality shows.
- Image Base64 — Converting a small icon or test image to a data URL lets you inline it in code.
- OCR Extractor — Text extraction returns nothing from a scanned PDF or a photographed document, because the page is a single im
- File Hash — Comparing hashes is the reliable way to confirm a build artefact or received file was not corrupted in transit