PasteCheck - Paste your code. See your errors. No setup, no signup.

Hey PH 👋 I'm Charles, I built PasteCheck because I kept switching between my code editor and AI tools just to catch basic syntax errors and the back-and-forth was killing my flow. PasteCheck is a single-purpose tool. Paste your code, get instant highlighted errors and warnings, tap any highlight for a plain-English explanation. No login, no install, no friction. Supports JavaScript, TypeScript, Python, and HTML — including mixed-language detection inside HTML files. It's free and always will be in its core form. Would love to hear what languages or features you'd want next. 🙏