Mismatched or unclosed tags are reported with the line where the problem starts.
Frequently asked questions
Is my data uploaded?
No. DevTidy runs entirely in your browser. Your input is processed on your device in a background Web Worker and never sent to a server, so it is safe for API keys, customer data and production configs.
Can it handle large files?
Yes. Heavy work runs in a Web Worker so the page stays responsive, and there is no upload size limit. Multi-megabyte inputs are fine; the practical limit is your device memory.