Empty or broken data
A missing link or a malformed URL means there's nothing useful to open.
Validator · Free · Private
QR code validator
Before you send a QR code to print, make sure it will actually scan. Paste your link or text and we check that it's well-formed, not too dense, and re-scannable — then flag anything worth fixing.
What's in the code
Paste exactly what your QR code encodes — a URL, WiFi
string, contact card or plain text.
Everything runs in your
browser — your content is never uploaded.
Report
Enter your link or text and press Validate to see the report.
What we check
Five things that make a QR code fail
A validation run catches the issues that most often stop a printed code from scanning.
Too much data
Long content packs in more modules, making the code dense and hard to read at small sizes.
Re-scan test
We render the code and read it back to confirm it decodes to exactly what you entered.
Secure links
We suggest https so the destination loads cleanly and looks trustworthy.
Print size hint
Denser codes need to be printed larger — we point you to the size calculator when that matters.
Content type
We identify whether it's a link, WiFi, contact or text so you know what will happen on scan.
FAQ
Validating codes, explained
What does “valid” actually mean?
It means the content encodes into a proper QR code, isn't so dense that it's fragile, and can be read back to exactly what you typed. We also check links are well-formed.
Does it check if my link is online?
No — to keep everything private and in your browser, we validate the code and the link's format, not whether the page is live. Open the link yourself to confirm it loads.
Why is my code flagged as too dense?
Longer content needs a higher QR version with more, smaller modules. Shorten the link (a redirect helps) or plan to print the code larger.
Is my content uploaded?
Never. Generation and the re-scan test both run locally in your browser.
Validated? Now size it right
Work out exactly how big to print your code so it scans from any distance.
Open the size calculator